This document discusses riveted joints, which are used to join metal plates. It describes the different types of rivet heads, riveted joint configurations like lap joints and butt joints, and how rivets are installed through heating and hammering. The document also discusses factors that determine the strength of riveted joints like the tearing resistance of plates, shearing resistance of rivets, and crushing resistance of plates and rivets. It explains how riveted joints can fail through tearing of plates, shearing of rivets, or crushing of plates/rivets. The efficiency of riveted joints is defined as the ratio of the joint's strength to the strength of an unriveted solid
The document discusses the design of welded joints. It begins by defining a welded joint as a permanent fusion of two parts achieved through heating and optionally applying pressure and a filler material. Welding provides advantages over riveted joints like lighter weight and greater efficiency. Various welding processes are described including gas, electric arc, thermit and forge welding. Common welded joint types like lap, butt, corner and T-joints are also outlined. The document then examines the strength calculations for transverse and parallel fillet welds as well as butt joints. It concludes by discussing stresses in eccentrically loaded and unsymmetrical welded sections.
,
diploma mechanical engineering
,
mechanical engineering
,
machine design
,
design of machine elements
,
knuckle joint
,
failures of knuckle joint under different streses
,
fork end
,
single eye end
,
knuckle pin
The document discusses welding processes and welded joints. It describes various welding techniques like gas welding, electric arc welding, and thermit welding. It defines butt and fillet welded joints and provides equations to calculate stresses in different welded joint configurations under tension, torsion, and bending loads. Examples are presented to determine weld lengths required to carry given loads based on allowable stresses in welds.
Unit 6- spur gears, Kinematics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
Saint-Venant's principle states that the stresses and strains far away from the load application point are unaffected by the exact nature of the load or its application method, but only depend on the resultant load magnitude and application area. Stress concentrations occur where the cross-sectional area changes abruptly, like holes, notches, or threads, and cause local stress values much higher than the average stress. The stress concentration factor K is used to relate the maximum stress Ļmax to the average stress Ļave in a cross-section. Design engineers use stress concentration factors and allowable stress values to determine if a given load will exceed the material's strength at stress concentration locations.
The document discusses riveted joints. It describes the different types of rivets and rivet heads. The key types of riveted joints are lap joints and butt joints. Important terms used in riveted joints are also defined, such as pitch and margin. Guidelines for the proportions of dimensions for riveted joints are provided. Examples of different double and single riveted lap and butt joints are shown.
This document discusses different machine elements used in machines. It describes power transmitting elements like shafts, gears, pulleys and cams that transmit power from one part of a machine to another. Holding elements like nuts, bolts and pins are used to hold machine parts together. Supporting elements like bearings and brackets provide structural support. Specific power transmitting elements discussed in more detail include shafts, gears, pulleys, cams and chains. Bearings are described as machine elements that support rotating or moving parts. Different types of bearings and couplings are also summarized.
This document discusses various types of governors used to regulate engine speed. It describes centrifugal governors that use rotating balls to control engine speed based on centrifugal force. Specific governors discussed include the Watt, Porter, Proell, Hartnell, Hartung, Wilson-Hartnell, and Pickering governors. Equations are provided for each governor relating factors like ball mass, radius of rotation, spring stiffness, and centrifugal force to the governor's operation and ability to control engine speed under varying loads.
The document discusses the design of welded joints. It begins by defining a welded joint as a permanent fusion of two parts achieved through heating and optionally applying pressure and a filler material. Welding provides advantages over riveted joints like lighter weight and greater efficiency. Various welding processes are described including gas, electric arc, thermit and forge welding. Common welded joint types like lap, butt, corner and T-joints are also outlined. The document then examines the strength calculations for transverse and parallel fillet welds as well as butt joints. It concludes by discussing stresses in eccentrically loaded and unsymmetrical welded sections.
,
diploma mechanical engineering
,
mechanical engineering
,
machine design
,
design of machine elements
,
knuckle joint
,
failures of knuckle joint under different streses
,
fork end
,
single eye end
,
knuckle pin
The document discusses welding processes and welded joints. It describes various welding techniques like gas welding, electric arc welding, and thermit welding. It defines butt and fillet welded joints and provides equations to calculate stresses in different welded joint configurations under tension, torsion, and bending loads. Examples are presented to determine weld lengths required to carry given loads based on allowable stresses in welds.
Unit 6- spur gears, Kinematics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
Saint-Venant's principle states that the stresses and strains far away from the load application point are unaffected by the exact nature of the load or its application method, but only depend on the resultant load magnitude and application area. Stress concentrations occur where the cross-sectional area changes abruptly, like holes, notches, or threads, and cause local stress values much higher than the average stress. The stress concentration factor K is used to relate the maximum stress Ļmax to the average stress Ļave in a cross-section. Design engineers use stress concentration factors and allowable stress values to determine if a given load will exceed the material's strength at stress concentration locations.
The document discusses riveted joints. It describes the different types of rivets and rivet heads. The key types of riveted joints are lap joints and butt joints. Important terms used in riveted joints are also defined, such as pitch and margin. Guidelines for the proportions of dimensions for riveted joints are provided. Examples of different double and single riveted lap and butt joints are shown.
This document discusses different machine elements used in machines. It describes power transmitting elements like shafts, gears, pulleys and cams that transmit power from one part of a machine to another. Holding elements like nuts, bolts and pins are used to hold machine parts together. Supporting elements like bearings and brackets provide structural support. Specific power transmitting elements discussed in more detail include shafts, gears, pulleys, cams and chains. Bearings are described as machine elements that support rotating or moving parts. Different types of bearings and couplings are also summarized.
This document discusses various types of governors used to regulate engine speed. It describes centrifugal governors that use rotating balls to control engine speed based on centrifugal force. Specific governors discussed include the Watt, Porter, Proell, Hartnell, Hartung, Wilson-Hartnell, and Pickering governors. Equations are provided for each governor relating factors like ball mass, radius of rotation, spring stiffness, and centrifugal force to the governor's operation and ability to control engine speed under varying loads.
1. The document discusses the fundamentals and types of mechanisms in machine theory. It covers kinematics, dynamics, types of links, kinematic pairs, and classifications of kinematic pairs.
2. A kinematic chain is formed when kinematic pairs are coupled together to transmit motion. The relationships between the number of links, pairs, and joints in a kinematic chain are explained.
3. Common kinematic chains including four-bar chains, single slider-crank chains, and double slider-crank chains are described. Inversions of mechanisms by fixing different links are used to obtain different mechanisms.
The document provides details about the design of a screw jack. It includes an introduction that discusses the background and history of screw jacks. It then outlines the objectives, scope, limitations and methodology of the screw jack design project. The document is divided into multiple chapters that cover literature reviews, detailed design and analysis of the screw jack parts, results and discussion, conclusions, and part/assembly drawings. The design aims to develop a screw jack that can lift a maximum load of 1.65 tons and optimize the existing design by replacing the hand lifter with a pedal lever to reduce energy usage.
This document discusses the fundamentals and types of mechanisms. It covers topics such as statics, dynamics, kinematics, kinetics, links, kinematic pairs, constrained motions, inversions of mechanisms, and common mechanisms. Examples are provided to illustrate concepts like the four bar chain, slider crank chain, Geneva mechanism, Ackermann steering, and rear wheel sprocket of a bicycle. Mechanisms are analyzed based on their motion, forces, components, and ability to transform input energy into useful work.
Unit 2 Design Of Shafts Keys and CouplingsMahesh Shinde
Ā
This document provides information about the design of shafts, keys, and couplings. It discusses transmission shafts, stresses induced in shafts, and shaft design based on strength and rigidity. It presents formulas for shaft design using maximum shear stress theory, distortion energy theory, and the ASME code. Several examples are provided to demonstrate how to calculate the diameter of a shaft given the power transmitted, loads on the shaft, material properties, and other parameters using these theories and codes. Assignments involving similar calculations of shaft diameters are presented.
The document discusses key terminology used in limits, fits, and tolerances including:
- Basic size, actual size, limits of size, deviations, tolerance, fundamental deviations, and fundamental tolerances.
- Holes and shafts refer to internal and external features, respectively.
- Fits include clearance, interference, and transition fits depending on how the tolerance zones of the hole and shaft overlap.
- Mass production aims to reduce costs and time through standardized parts, tools, and measurements while ensuring interchangeability.
The document discusses various concepts related to belt drives, including:
1. Definitions of key terms used in belt drive calculations such as velocity ratio, slip, creep, tension, power transmission.
2. Types of belt drives including open, crossed, and quarter turn drives. Belt drives can also include idler pulleys.
3. Properties of common belt materials like leather, cotton, rubber, and their densities. Recommended belt speeds are between 20-22.5 m/s.
1) The document discusses the impact of a jet of water on stationary and moving plates. It defines impact of jet as the force exerted by the jet on a plate.
2) Key factors that determine the force include the jet velocity, plate velocity, plate angle, and whether the plate is flat, curved, or includes a series of vanes.
3) Formulas are provided to calculate the force and work done on plates in different configurations based on impulse-momentum principles.
Module 1 introduction to kinematics of machinerytaruian
Ā
This document provides information about the Kinematics of Machines course offered by the Department of Mechanical Engineering at JSS Academy of Technical Education in Bangalore, India. It lists the course code, textbooks, reference books, course outcomes, and chapter topics that will be covered. The topics include basic definitions related to kinematic elements, pairs, chains, and mechanisms. It describes types of kinematic pairs and chains, including four-bar chains, single slider-crank chains, and double slider-crank chains. It also covers degrees of freedom, Grubler's criterion, and inversions of mechanisms.
ME010 801 Design of Transmission Elements
(Common with AU010 801)
Teaching scheme Credits: 4
2 hours lecture, 2 hour tutorial and 1 hour drawing per week
Objectives
To provide basic design skill with regard to various transmission elements like clutches, brakes, bearings and
gears.
Module I (20 Hrs)
Clutches - friction clutches- design considerations-multiple disc clutches-cone clutch- centrifugal clutch -
Brakes- Block brake- band brake- band and block brake-internal expanding shoe brake.
Module II (17 Hrs)
Design of bearings - Types - Selection of a bearing type - bearing life - Rolling contact bearings - static
and dynamic load capacity - axial and radial loads - selection of bearings - dynamic equivalent load -
lubrication and lubricants - viscosity - Journal bearings - hydrodynamic theory - design considerations -
heat balance - bearing characteristic number - hydrostatic bearings.
Module III (19 Hrs)
Gears- classification- Gear nomenclature - Tooth profiles - Materials of gears - design of spur, helical,
bevel gears and worm & worm wheel - Law of gearing - virtual or formative number of teeth- gear tooth
failures- Beam strength - Lewis equation- Buckinghamās equation for dynamic load- wear loadļæ¾endurance strength of tooth- surface durability- heat dissipation - lubrication of gears - Merits and
demerits of each type of gears.
Module IV (16 Hrs)
Design of Internal Combustion Engine parts- Piston, Cylinder, Connecting rod, Flywheel
Design recommendations for Forgings- castings and welded products- rolled sections- turned parts,
screw machined products- Parts produced on milling machines. Design for manufacturing - preparation
of working drawings - working drawings for manufacture of parts with complete specifications including
manufacturing details.
Note: Any one of the following data book is permitted for reference in the final University examination:
1. Machine Design Data hand book by K. Lingaiah, Suma Publishers, Bangalore/ Tata Mc Graw Hill
2. PSG Design Data, DPV Printers, Coimbatore.
Text Books
1. C.S,Sarma, Kamlesh Purohit, Design of Machine Elements Prentice Hall of India Ltd NewDelhi
2. V.B.Bhandari, Design of Machine Elements McGraw Hill Book Company
3. M. F. Spotts, T. E. Shoup, Design of Machine Elements, Pearson Education.
Reference Books
1. J. E. Shigley, Mechanical Engineering Design, McGraw Hill Book Company.
2. Juvinall R.C & Marshek K.M., Fundamentals of Machine Component Design, John Wiley
3. Doughtie V.L., & Vallance A.V., Design of Machine Elements, McGraw Hill Book Company.
4. Siegel, Maleev & Hartman, Mechanical Design of Machines, International Book Company
PPT PRESENTATION ON COULOMB DAMPING AND VISCOUS DAMPINGsrinivas cnu
Ā
This document summarizes two types of damping: Coulomb damping and viscous damping. Coulomb damping involves friction between two surfaces, with a friction force proportional to the normal force. Viscous damping dissipates energy through forces proportional to velocity as objects move through fluids. Examples of each type are given, such as friction joints in airplanes for Coulomb damping and fluid films between surfaces for viscous damping. Key differences between the two types are outlined in a table, such as viscous damping force depending on velocity while Coulomb damping force depends on friction coefficients.
Theory of machines by rs. khurmi_ solution manual _ chapter 11Darawan Wahid
Ā
This document provides solutions to problems involving belt drives, including calculations of speed ratios, tensions, power transmission, and efficiency. It solves for:
1) The speeds of driven pulleys using no-slip and slip equations, with sample speeds of 239.4 r.p.m and 232.22 r.p.m.
2) Transmitted power of 3.983 kW for a pulley drive system with given parameters.
3) A belt width of 67.4 mm needed to transmit 7.5 kW between pulleys without exceeding tension limits.
Kinematic synthesis deals with determining link lengths and orientations of mechanisms to satisfy motion requirements. This document discusses several key concepts in kinematic synthesis of planar mechanisms, including:
1) Movability/mobility synthesis which determines the degrees of freedom using Gruebler's criterion. The simplest mechanism is the four-bar linkage.
2) Transmission angle synthesis which aims to position links for maximum torque transmission, usually near 90Ā°.
3) Limit positions and dead centers which are configurations of four-bar mechanisms where links are collinear.
4) Graphical synthesis methods using the pole and relative pole to determine link lengths and positions based on input/output motion specifications.
This document discusses machine design and the basic procedures and requirements for designing machine elements. It defines machine design as using scientific principles, technical information, and imagination to describe machines that perform functions with maximum economy and efficiency. The basic requirements for machine elements are then listed, including strength, rigidity, wear resistance, manufacturability, safety, and more. The basic procedure for designing machine elements is then outlined in 6 steps: specification of function, determination of forces, selection of material, failure criterion, determination of dimensions, and preparation of working drawings. Materials that could be used like cast iron, plain carbon steel, and alloy steels are then described in more detail.
Unit 7-gear trains, Kinematics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
1) Chip formation involves the shear deformation of work material to form a chip as new material is exposed during cutting.
2) There are four basic types of chips in machining: continuous, discontinuous, serrated, and those with built-up edge (BUE).
3) The type of chip formed depends on factors like the work material, tool geometry, cutting speeds and feeds, and machining environment. Understanding chip formation helps optimize the machining process.
Unit-3 - Velocity and acceleration of mechanisms, Kinematics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
Unit 4- balancing of rotating masses, Dynamics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
This document provides definitions and principles related to locating and clamping in jigs and fixtures design. It defines a jig as a device that holds work and locates the tool path, and a fixture as a device that locates work on a machine table. It discusses locating principles like six point location and 3-2-1 principle. It also covers various locating and clamping devices like pins, buttons, V-locators, and different types of clamps. The document aims to provide fundamental guidelines for effective design of jigs and fixtures.
Bearings are used in machines to allow rotating parts to move freely while supporting loads. There are two main types of bearings: sliding contact/frictional bearings which operate on sliding friction; and rolling contact/anti-frictional bearings which have rolling elements like balls or rollers to reduce friction. Rolling contact bearings can carry heavier loads than sliding contact bearings and have lower friction, but are more complex and expensive to manufacture. Bearings are classified based on the type of load they support, such as radial loads, axial/thrust loads, or combined loads. Common bearing types include ball bearings, roller bearings, tapered roller bearings, and needle roller bearings.
Caulking and fullering are processes used to make joints in pressure vessels and pipes fluid-tight. Caulking involves using a narrow tool to burr down the edge of a plate into a beveled joint. Fullering uses a tool the same thickness as the plate to provide a cleaner finish with less risk of damage. Both processes are employed to seal joints in structures like boilers and pipes, with fullering now more commonly used due to producing tighter seals with less risk of plate damage during the process.
- The document discusses the design of riveted joints, including the materials, manufacturing processes, and types of rivets and riveted joints used.
- It provides details on the essential qualities, failures, strength, and efficiency of riveted joints. Specific guidelines are given for the design of boiler joints, including assumptions made and determining the thickness, diameter of rivets, pitch, number of rows, and overlap for longitudinal butt joints and circumferential lap joints.
1. The document discusses the fundamentals and types of mechanisms in machine theory. It covers kinematics, dynamics, types of links, kinematic pairs, and classifications of kinematic pairs.
2. A kinematic chain is formed when kinematic pairs are coupled together to transmit motion. The relationships between the number of links, pairs, and joints in a kinematic chain are explained.
3. Common kinematic chains including four-bar chains, single slider-crank chains, and double slider-crank chains are described. Inversions of mechanisms by fixing different links are used to obtain different mechanisms.
The document provides details about the design of a screw jack. It includes an introduction that discusses the background and history of screw jacks. It then outlines the objectives, scope, limitations and methodology of the screw jack design project. The document is divided into multiple chapters that cover literature reviews, detailed design and analysis of the screw jack parts, results and discussion, conclusions, and part/assembly drawings. The design aims to develop a screw jack that can lift a maximum load of 1.65 tons and optimize the existing design by replacing the hand lifter with a pedal lever to reduce energy usage.
This document discusses the fundamentals and types of mechanisms. It covers topics such as statics, dynamics, kinematics, kinetics, links, kinematic pairs, constrained motions, inversions of mechanisms, and common mechanisms. Examples are provided to illustrate concepts like the four bar chain, slider crank chain, Geneva mechanism, Ackermann steering, and rear wheel sprocket of a bicycle. Mechanisms are analyzed based on their motion, forces, components, and ability to transform input energy into useful work.
Unit 2 Design Of Shafts Keys and CouplingsMahesh Shinde
Ā
This document provides information about the design of shafts, keys, and couplings. It discusses transmission shafts, stresses induced in shafts, and shaft design based on strength and rigidity. It presents formulas for shaft design using maximum shear stress theory, distortion energy theory, and the ASME code. Several examples are provided to demonstrate how to calculate the diameter of a shaft given the power transmitted, loads on the shaft, material properties, and other parameters using these theories and codes. Assignments involving similar calculations of shaft diameters are presented.
The document discusses key terminology used in limits, fits, and tolerances including:
- Basic size, actual size, limits of size, deviations, tolerance, fundamental deviations, and fundamental tolerances.
- Holes and shafts refer to internal and external features, respectively.
- Fits include clearance, interference, and transition fits depending on how the tolerance zones of the hole and shaft overlap.
- Mass production aims to reduce costs and time through standardized parts, tools, and measurements while ensuring interchangeability.
The document discusses various concepts related to belt drives, including:
1. Definitions of key terms used in belt drive calculations such as velocity ratio, slip, creep, tension, power transmission.
2. Types of belt drives including open, crossed, and quarter turn drives. Belt drives can also include idler pulleys.
3. Properties of common belt materials like leather, cotton, rubber, and their densities. Recommended belt speeds are between 20-22.5 m/s.
1) The document discusses the impact of a jet of water on stationary and moving plates. It defines impact of jet as the force exerted by the jet on a plate.
2) Key factors that determine the force include the jet velocity, plate velocity, plate angle, and whether the plate is flat, curved, or includes a series of vanes.
3) Formulas are provided to calculate the force and work done on plates in different configurations based on impulse-momentum principles.
Module 1 introduction to kinematics of machinerytaruian
Ā
This document provides information about the Kinematics of Machines course offered by the Department of Mechanical Engineering at JSS Academy of Technical Education in Bangalore, India. It lists the course code, textbooks, reference books, course outcomes, and chapter topics that will be covered. The topics include basic definitions related to kinematic elements, pairs, chains, and mechanisms. It describes types of kinematic pairs and chains, including four-bar chains, single slider-crank chains, and double slider-crank chains. It also covers degrees of freedom, Grubler's criterion, and inversions of mechanisms.
ME010 801 Design of Transmission Elements
(Common with AU010 801)
Teaching scheme Credits: 4
2 hours lecture, 2 hour tutorial and 1 hour drawing per week
Objectives
To provide basic design skill with regard to various transmission elements like clutches, brakes, bearings and
gears.
Module I (20 Hrs)
Clutches - friction clutches- design considerations-multiple disc clutches-cone clutch- centrifugal clutch -
Brakes- Block brake- band brake- band and block brake-internal expanding shoe brake.
Module II (17 Hrs)
Design of bearings - Types - Selection of a bearing type - bearing life - Rolling contact bearings - static
and dynamic load capacity - axial and radial loads - selection of bearings - dynamic equivalent load -
lubrication and lubricants - viscosity - Journal bearings - hydrodynamic theory - design considerations -
heat balance - bearing characteristic number - hydrostatic bearings.
Module III (19 Hrs)
Gears- classification- Gear nomenclature - Tooth profiles - Materials of gears - design of spur, helical,
bevel gears and worm & worm wheel - Law of gearing - virtual or formative number of teeth- gear tooth
failures- Beam strength - Lewis equation- Buckinghamās equation for dynamic load- wear loadļæ¾endurance strength of tooth- surface durability- heat dissipation - lubrication of gears - Merits and
demerits of each type of gears.
Module IV (16 Hrs)
Design of Internal Combustion Engine parts- Piston, Cylinder, Connecting rod, Flywheel
Design recommendations for Forgings- castings and welded products- rolled sections- turned parts,
screw machined products- Parts produced on milling machines. Design for manufacturing - preparation
of working drawings - working drawings for manufacture of parts with complete specifications including
manufacturing details.
Note: Any one of the following data book is permitted for reference in the final University examination:
1. Machine Design Data hand book by K. Lingaiah, Suma Publishers, Bangalore/ Tata Mc Graw Hill
2. PSG Design Data, DPV Printers, Coimbatore.
Text Books
1. C.S,Sarma, Kamlesh Purohit, Design of Machine Elements Prentice Hall of India Ltd NewDelhi
2. V.B.Bhandari, Design of Machine Elements McGraw Hill Book Company
3. M. F. Spotts, T. E. Shoup, Design of Machine Elements, Pearson Education.
Reference Books
1. J. E. Shigley, Mechanical Engineering Design, McGraw Hill Book Company.
2. Juvinall R.C & Marshek K.M., Fundamentals of Machine Component Design, John Wiley
3. Doughtie V.L., & Vallance A.V., Design of Machine Elements, McGraw Hill Book Company.
4. Siegel, Maleev & Hartman, Mechanical Design of Machines, International Book Company
PPT PRESENTATION ON COULOMB DAMPING AND VISCOUS DAMPINGsrinivas cnu
Ā
This document summarizes two types of damping: Coulomb damping and viscous damping. Coulomb damping involves friction between two surfaces, with a friction force proportional to the normal force. Viscous damping dissipates energy through forces proportional to velocity as objects move through fluids. Examples of each type are given, such as friction joints in airplanes for Coulomb damping and fluid films between surfaces for viscous damping. Key differences between the two types are outlined in a table, such as viscous damping force depending on velocity while Coulomb damping force depends on friction coefficients.
Theory of machines by rs. khurmi_ solution manual _ chapter 11Darawan Wahid
Ā
This document provides solutions to problems involving belt drives, including calculations of speed ratios, tensions, power transmission, and efficiency. It solves for:
1) The speeds of driven pulleys using no-slip and slip equations, with sample speeds of 239.4 r.p.m and 232.22 r.p.m.
2) Transmitted power of 3.983 kW for a pulley drive system with given parameters.
3) A belt width of 67.4 mm needed to transmit 7.5 kW between pulleys without exceeding tension limits.
Kinematic synthesis deals with determining link lengths and orientations of mechanisms to satisfy motion requirements. This document discusses several key concepts in kinematic synthesis of planar mechanisms, including:
1) Movability/mobility synthesis which determines the degrees of freedom using Gruebler's criterion. The simplest mechanism is the four-bar linkage.
2) Transmission angle synthesis which aims to position links for maximum torque transmission, usually near 90Ā°.
3) Limit positions and dead centers which are configurations of four-bar mechanisms where links are collinear.
4) Graphical synthesis methods using the pole and relative pole to determine link lengths and positions based on input/output motion specifications.
This document discusses machine design and the basic procedures and requirements for designing machine elements. It defines machine design as using scientific principles, technical information, and imagination to describe machines that perform functions with maximum economy and efficiency. The basic requirements for machine elements are then listed, including strength, rigidity, wear resistance, manufacturability, safety, and more. The basic procedure for designing machine elements is then outlined in 6 steps: specification of function, determination of forces, selection of material, failure criterion, determination of dimensions, and preparation of working drawings. Materials that could be used like cast iron, plain carbon steel, and alloy steels are then described in more detail.
Unit 7-gear trains, Kinematics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
1) Chip formation involves the shear deformation of work material to form a chip as new material is exposed during cutting.
2) There are four basic types of chips in machining: continuous, discontinuous, serrated, and those with built-up edge (BUE).
3) The type of chip formed depends on factors like the work material, tool geometry, cutting speeds and feeds, and machining environment. Understanding chip formation helps optimize the machining process.
Unit-3 - Velocity and acceleration of mechanisms, Kinematics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
Unit 4- balancing of rotating masses, Dynamics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
This document provides definitions and principles related to locating and clamping in jigs and fixtures design. It defines a jig as a device that holds work and locates the tool path, and a fixture as a device that locates work on a machine table. It discusses locating principles like six point location and 3-2-1 principle. It also covers various locating and clamping devices like pins, buttons, V-locators, and different types of clamps. The document aims to provide fundamental guidelines for effective design of jigs and fixtures.
Bearings are used in machines to allow rotating parts to move freely while supporting loads. There are two main types of bearings: sliding contact/frictional bearings which operate on sliding friction; and rolling contact/anti-frictional bearings which have rolling elements like balls or rollers to reduce friction. Rolling contact bearings can carry heavier loads than sliding contact bearings and have lower friction, but are more complex and expensive to manufacture. Bearings are classified based on the type of load they support, such as radial loads, axial/thrust loads, or combined loads. Common bearing types include ball bearings, roller bearings, tapered roller bearings, and needle roller bearings.
Caulking and fullering are processes used to make joints in pressure vessels and pipes fluid-tight. Caulking involves using a narrow tool to burr down the edge of a plate into a beveled joint. Fullering uses a tool the same thickness as the plate to provide a cleaner finish with less risk of damage. Both processes are employed to seal joints in structures like boilers and pipes, with fullering now more commonly used due to producing tighter seals with less risk of plate damage during the process.
- The document discusses the design of riveted joints, including the materials, manufacturing processes, and types of rivets and riveted joints used.
- It provides details on the essential qualities, failures, strength, and efficiency of riveted joints. Specific guidelines are given for the design of boiler joints, including assumptions made and determining the thickness, diameter of rivets, pitch, number of rows, and overlap for longitudinal butt joints and circumferential lap joints.
The document analyzes rivets using finite element analysis. It discusses rivet design, materials, and joining techniques like cold riveting and hot riveting. Finite element analysis software ANSYS is used to model and analyze single lap riveted joints with and without adhesive. Results show stresses and deformations in the rivet and joint. The analysis finds finite element methods to be effective for designing mechanical components like riveted joints, and ANSYS can accurately model complex joint geometries. Using adhesives between plates leads to more uniform stress distribution and increased joint life.
This document discusses riveted joints and provides details on:
1. Rivets are used to make permanent fastenings between metal plates in structures like ships, bridges, tanks, and boilers. A rivet has a head and a cylindrical shank.
2. The main types of riveted joints are lap joints and butt joints. Lap joints have one plate overlapping the other. Butt joints have plates aligned with a cover plate riveted on one or both sides.
3. Important considerations in riveted joint design include rivet pitch, margin, shear strength, tearing strength, and crushing strength. The joint strength is the lowest of these values.
1. The document discusses various engineering drawing codes, symbols, and standards including abbreviations, IS codes, and presentation rules.
2. Welding symbols and their components like arrow lines, reference lines, weld size, finish symbols, and unwelded lengths are defined. Riveted joint types and rivet head forms are also covered.
3. Screw thread terms such as crest, root, pitch, and types including V-thread, square thread, and metric threads are explained. Keys, fasteners, and threaded components like bolts, nuts, and taps are also discussed.
The document discusses various types of welded joints, including lap joints, butt joints, and fillet welds. It describes the advantages of welded joints over riveted joints. Various welding processes are covered, including fusion welding processes like gas welding and electric arc welding. The document provides formulas to calculate the strength of different welded joint configurations, like transverse and parallel fillet welds, and discusses special cases like circular fillet welds subjected to torsion or bending moments. Design considerations for different welded joints are also presented.
Lecture Riveted Joints by molvie imran.pptxBDULQAYYUM
Ā
This document provides an overview of rivets and riveted joints. It discusses the types of rivets used in construction, their materials, and essential properties. It describes the methods of riveting and classifications of rivet heads and riveted joints. Key terminology used in riveted joints is defined. The document also discusses caulking and fullering operations, common failure modes of riveted joints, and equations to determine the strength of riveted joints. The overall purpose is to introduce the topic of rivets and riveted joints for mechanical engineering applications.
This document discusses rivets, rivet joints, and riveting methods. It describes rivets as short cylindrical rods with a head and tapered tail used to fasten metal parts. There are two main types of rivet joints: lap joints, where one plate overlaps the other; and butt joints, where plates are aligned with a cover plate. Rivets are typically made of steel, aluminum, or other metals. Riveting can be done cold or hot, by hand or machine. The riveting process involves placing rivets through drilled or punched holes and forming the rivet ends to secure the plates tightly together. Rivet joints are commonly used in shipbuilding, aircraft construction,
The document discusses the design of pipes and pipe joints. It covers topics such as stresses in pipes, wall thickness calculations, types of pipe joints like flanged joints, and design considerations for circular, oval and square flanged pipe joints. Design examples are provided for calculating stresses in pipes, pipe dimensions, and dimensions of different flanged pipe joints based on internal fluid pressure and material properties. Standard dimensions for steam pipe flanges according to Indian boiler regulations are also mentioned. Hydraulic pipe joints for high pressures use heavier oval or square flanges secured by multiple bolts to withstand pressures up to 47.5 N/mm2.
This document contains a summary of 5 lectures on the design of riveted and welded joints:
1. Lecture 1 introduces riveted joints, including types of rivets, types of riveted joints, and riveting methods.
2. Lecture 2 describes types of riveted joints in more detail, including lap joints and butt joints.
3. Lecture 3 covers failures of riveted joints, riveting processes like caulking and fullering, and the design of longitudinal butt joints for boilers.
4. Lectures 4 and 5 provide more details on the design of longitudinal and circumferential lap joints for boilers, including determining thickness
1. The document discusses different types of joints used to connect structural components including knuckle joints, welded joints, and fillet joints.
2. Knuckle joints provide flexibility and angular movement, while welded joints create a permanent connection through fusion. Fillet joints are made by overlapping plates and welding their edges.
3. The document provides equations to calculate the strength of various welded and fillet joint configurations based on the load applied and permissible stress levels. Examples are given of calculating weld sizes for different joint geometries under static and fatigue loading conditions.
The document discusses various types of shafts and shaft couplings. It provides information on shaft materials, sizing, layout and design considerations. Regarding couplings, it describes rigid couplings like sleeve, flange and marine couplings. It also discusses flexible bush pin couplings. Key points covered include shaft material selection, stress analysis for sizing, deflection requirements, coupling design for strength, rigidity and alignment between connected shafts. Common shaft and coupling types, their designs and applications are explained.
The document discusses different types of fasteners used to join machine parts, including screwed fasteners, riveted joints, and keys. It describes various threaded components like bolts, nuts, and studs. It discusses different thread profiles like metric, square, and ACME threads. It also covers rivet types, dimensions of riveted joints, and types of keys used in pin joints.
Multi-StageSheet Metal Fromed Bolted Fastener DesignMark Brooks
Ā
This document discusses the development of a multi-stage sheet metal fastening design that eliminates nuts to reduce costs and improve manufacturing efficiency. Testing showed that while extruded, rivet, and PEM nuts exceeded torque specifications, shear/tap fasteners only marginally met specifications, failing through thread tear. To breakthrough this technology barrier, the basics of thread forming were revisited. Roll-forming threads through compression may improve performance over cutting threads.
The document discusses various mechanical fastening and assembly methods. It describes common threaded fasteners like screws, bolts, nuts and how they are used. Other fastening methods discussed include rivets, press fits, shrink fits, snap fits, retaining rings, staples and sewing. The document also covers design for assembly principles to reduce assembly costs through minimizing part counts and ease of assembly.
The document discusses steel structures and structural drafting. It covers various topics related to steel including properties, structural joints, technical terms, and design elements. Specific sections are dedicated to steel columns, plate girders, purposes and uses of steel, advantages and disadvantages of steel structures, steel structure drawings, working drawings, fabrication, and roof systems of steel trusses. The document provides information needed for structural drafting and elementary structural design.
Lecture 8_MDPE_Design of Nozzles & Flange.pdfPatelDhruvil20
Ā
Lecture 8_MDPE_Design of Nozzles & Flange.pdf
Introduction :
Concept of internal & external design pressure, design stress & design temperature,
Different types of equipments, Static & rotary equipments, Different types of static
equipments, Various mechanical properties of material, Different methods of
fabrication, Different types of welding joints, Joint efficiency, Radiography.
04
2 Mechanical design of Pressure vessel:
Introduction of ASME Code sec-VIII, DIV-I & IS-2825, Classification of pressure vessel as
per IS-2825,Mechanical design of Shell: shell subjected to internal pressure, Graphical
& analytical method for Shell subjected to external pressure, design of shell for
external pressure with & without stiffening ring, Different types of head, their selection
criteria, Mechanical design of heads: Heads subjected to internal pressure, Graphical
& analytical method for heads subjected to external pressure, Different types of
Nozzles, their selection criteria, Design of nozzle pipe, Design of reinforcement pad by
area for area method, Different types of flanges, Different types of standard flanges,
their important features & selection criteria, Different
This document discusses riveted connections and their design. It covers the different types of riveted joints like lap joints and butt joints. It provides specifications for riveted connections like the gross diameter of rivets, gauge, pitch and edge distance. It also discusses the types of failures in riveted connections and how to calculate the strength of riveted joints based on the strength of rivets in shear and bearing and the strength of plates in tension. The efficiency of riveted joints is defined. Examples of calculating rivet values are also provided.
The document discusses various topics related to screwed joints and fastenings including:
1. The advantages and disadvantages of screwed joints.
2. Important terms used in screw threads such as major diameter, pitch, and crest.
3. Different types of screw threads including British Standard, American, and metric threads.
4. Factors to consider when locating screwed joints such as reducing bending stresses.
5. Common types of screw fastenings like through bolts, studs, and set screws.
This document outlines the contents of a course on neural networks and deep learning across multiple weeks. It covers topics such as neural network basics including logistic regression and activation functions, deep neural networks, improving networks through techniques like regularization and optimization algorithms, convolutional neural networks including applications to object detection, and face recognition. Specific algorithms and architectures discussed include residual networks, Inception networks, YOLO, R-CNN, and Siamese networks.
The document appears to be a 16 page resume or CV for Mohamed Mohamed El-Sayed Atyya. It includes his contact information on page 16, but does not provide much detail on the contents of pages 1 through 15. The references section lists 4 textbooks on numerical analysis and methods. The contact information suggests this document is for academic or educational purposes.
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The document appears to be a 19 page document authored by Mohamed Mohamed El-Sayed Atyya. Each page contains the author's name and the page number. The last page provides references for numerical analysis textbooks and contact information for the author.
This 10-page document appears to be a thesis or report written by Mohamed Mohamed El-Sayed Atyya. It consists of 10 sequentially numbered pages with no other visible content. The final page provides 4 references and contact information for the author.
This 10-page document appears to be a thesis or report written by Mohamed Mohamed El-Sayed Atyya. It consists of 10 sequentially numbered pages with no other visible content. The final page provides 4 references and contact information for the author.
The document appears to be a 12 page document about an individual named Mohamed Mohamed El-Sayed Atyya. It includes 10 blank pages with his name and page number followed by a references section listing 4 textbooks on numerical analysis and algorithms. The final page includes his contact information.
This document discusses numerical methods for solving linear systems of equations. It begins by introducing linear systems in general and matrix forms, and classifying them as homogeneous or non-homogeneous. It then discusses checking for consistency. The main methods covered for obtaining solutions are: Gauss elimination, Gauss-Jordan elimination, using the inverse matrix if it exists, and iterative techniques. Specific examples are provided to demonstrate how to apply Gauss elimination, Gauss-Jordan elimination and using the inverse matrix to solve sample systems.
This document discusses various aspects of worm gears, including:
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2. The three main types of worm gears: straight face, hobbed straight face, and concave face.
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This document discusses bevel gears, including definitions of key terms, classifications, determination of pitch angle, proportions, strength calculations, and shaft design. It defines bevel gears as connecting two intersecting shafts at an angle to transmit power at a constant velocity ratio. Key points covered include:
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- Pitch angle is determined based on the shaft intersection angle and required velocity ratio.
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- Forces on gears include tangential, radial, and axial components that create bearing reactions and thrust.
- Shaft design involves
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- The formative or equivalent number of teeth for a helical gear accounts for the helix angle, and is calculated as the actual number of teeth divided by the cosine of the helix angle cubed.
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2) It describes different types of chains including hoisting/hauling chains, conveyor chains, and power transmitting chains like roller chains and silent chains.
3) It provides equations for calculating important chain drive dimensions and specifications like length of chain, center distance, factor of safety, power transmitted, and number of teeth on sprockets.
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This document discusses various topics related to power screws including:
- Types of screw threads used for power transmission like square, acme, and buttress threads.
- The torque required to raise or lower a load using a square threaded screw, which depends on the helix angle and friction angle.
- The maximum efficiency of a square threaded screw occurs at a helix angle between 40-45 degrees.
- Self-locking screws have a friction angle greater than the helix angle, while overhauling screws have a friction angle less than the helix angle.
- Additional sections cover efficiency as it relates to screw and collar friction, stresses in power screws, differential and compound screws, and design considerations for screw
The document discusses different types of levers used in engineering. It describes the design process for various levers including hand levers, foot levers, and cranked levers. For each type of lever, the document outlines how to determine the necessary dimensions based on the applied forces and stresses to ensure adequate strength. Design considerations include the diameter and length of pins, thickness and width of lever arms, and selection of appropriate cross sectional shapes.
Cricket management system ptoject report.pdfKamal Acharya
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The aim of this project is to provide the complete information of the National and
International statistics. The information is available country wise and player wise. By
entering the data of eachmatch, we can get all type of reports instantly, which will be
useful to call back history of each player. Also the team performance in each match can
be obtained. We can get a report on number of matches, wins and lost.
Covid Management System Project Report.pdfKamal Acharya
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CoVID-19 sprang up in Wuhan China in November 2019 and was declared a pandemic by the in January 2020 World Health Organization (WHO). Like the Spanish flu of 1918 that claimed millions of lives, the COVID-19 has caused the demise of thousands with China, Italy, Spain, USA and India having the highest statistics on infection and mortality rates. Regardless of existing sophisticated technologies and medical science, the spread has continued to surge high. With this COVID-19 Management System, organizations can respond virtually to the COVID-19 pandemic and protect, educate and care for citizens in the community in a quick and effective manner. This comprehensive solution not only helps in containing the virus but also proactively empowers both citizens and care providers to minimize the spread of the virus through targeted strategies and education.
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Sachpazis_Consolidation Settlement Calculation Program-The Python Code and th...Dr.Costas Sachpazis
Ā
Consolidation Settlement Calculation Program-The Python Code
By Professor Dr. Costas Sachpazis, Civil Engineer & Geologist
This program calculates the consolidation settlement for a foundation based on soil layer properties and foundation data. It allows users to input multiple soil layers and foundation characteristics to determine the total settlement.
2. 1 Notations
ā¢ p = Pitch of the rivets.
ā¢ d = Diameter of the rivet hole.
ā¢ t = Thickness of the plate.
ā¢ Ļt = Permissible tensile stress for the plate material.
ā¢ Ļ = Safe permissible shear stress for the rivet material.
ā¢ n = Number of rivets.
ā¢ Ļc = Safe permissible crushing stress for the rivet or plate material.
ā¢ P = Steam pressure in boiler.
ā¢ D = Internal diameter of shell.
ā¢ Ī·l = Eļ¬ciency of the longitudinal joint.
ā¢ C = Constant.
ā¢ m = Margin.
ā¢ b = Width of the plate.
ā¢ Pt = Maximum pull acting on the joint. This is the tearing resistance of the plate at the outer row which
has only one rivet.
ā¢ e = Eccentricity of the load i.e. the distance between the line of action of the load and the centroid of the
rivet system i.e. G.
ā¢ A = Cross-sectional area of each rivet.
ā¢ x1, x2, x3 etc. = Distances of rivets from OY .
ā¢ y1, y2, y3 etc. = Distances of rivets from OX.
ā¢ F1, F2, F3 ... = Secondary shear loads on the rivets 1, 2, 3...etc.
ā¢ l1, l2, l3 ... = Radial distance of the rivets 1, 2, 3 ...etc. from the center of gravity G of the rivet system.
ā¢ Īø = Angle between the primary or direct shear load (Ps) and secondary shear load (F).
3. 2 Introduction
A rivet is a short cylindrical bar with a head integral to
it. The cylindrical portion of the rivet is called shank
or body and lower portion of shank is known as tail.
The rivets are used to make permanent fastening be-
tween the plates such as in structural work, ship build-
ing, bridges, tanks and boiler shells. The riveted joints
are widely used for joining light metals.
The fastenings (i.e.joints) may be classiļ¬ed into the fol-
lowing two groups :
1. Permanent fastenings are those fastenings
which can not be disassembled without destroy-
ing the connecting components. The examples of
permanent fastenings in order of strength are sol-
dered, brazed, welded and riveted joints.
2. Temporary or detachable fastenings are
those fastenings which can be disassembled with-
out destroying the connecting components. The
examples of temporary fastenings are screwed,
keys, cotters, pins and splined joints.
Figure 1: Rivet parts.
3 Methods of Riveting
The function of rivets in a joint is to make a connection that has strength and tightness. The strength is
necessary to prevent failure of the joint. The tightness is necessary in order to contribute to strength and to
prevent leakage as in a boiler or in a ship hull.
When two plates are to be fastened together by a rivet , the holes in the plates are punched and reamed or drilled.
Punching is the cheapest method and is used for relatively thin plates and in structural work. Since punching
injures the material around the hole, therefore drilling is used in most pressure-vessel work. In structural and
pressure vessel riveting, the diameter of the rivet hole is usually 1.5 mm larger than the nominal diameter of
the rivet.
The plates are drilled together and then separated to remove any burrs or chips so as to have a tight ļ¬ush joint
between the plates. A cold rivet or a red hot rivet is introduced into the plates and the point (i.e.second head)
is then formed. When a cold rivet is used, the process is known as cold riveting and when a hot rivet is used,
the process is known as hot riveting. The cold riveting process is used for structural joints while hot riveting
is used to make leak proof joints.
The riveting may be done by hand or by a riveting machine. In hand riveting, the original rivet head is backed
up by a hammer or heavy bar and then the die or set, is placed against the end to be headed and the blows
are applied by a hammer. This causes the shank to expand thus ļ¬lling the hole and the tail is converted into
a point. As the rivet cools, it tends to contract. The lateral contraction will be slight, but there will be a
longitudinal tension introduced in the rivet which holds the plates ļ¬rmly together.
In machine riveting, the die is a part of the hammer which is operated by air, hydraulic or steam pressure.
Notes:
1. For steel rivets upto 12 mm diameter, the cold riveting process may be used while for larger diameter
rivets, hot riveting process is used.
2. In case of long rivets, only the tail is heated and not the whole shank.
Figure 2: Methods of riveting.
4. 4 Material of Rivets
The material of the rivets must be tough and ductile. They are usually made of steel (low carbon steel or nickel
steel), brass, aluminum or copper, but when strength and a ļ¬uid tight joint is the main consideration, then the
steel rivets are used.
The rivets for general purposes shall be manufactured from steel conforming to the following Indian Standards:
1. IS : 1148-1982 (Reaļ¬rmed 1992) - Speciļ¬cation for hot rolled rivet bars (up to 40 mm diameter) for
structural purposes; or
2. IS : 1149-1982 (Reaļ¬rmed 1992) - Speciļ¬cation for high tensile steel rivet bars for structural purposes.
5 Essential Qualities of a Rivet
According to Indian standard, IS : 2998 1982 (Reaļ¬rmed 1992), the material of a rivet must have a tensile
strength not less than 40 N/mm2
and elongation not less than 26 percent. The material must be of such quality
that when in cold condition, the shank shall be bent on itself through 180o
without cracking and after being
heated to 650o
C and quenched, it must pass the same test. The rivet when hot must ļ¬atten without cracking
to a diameter 2.5 times the diameter of shank.
6 Manufacture of Rivets
According to Indian standard speciļ¬cations, the rivets may be made either by cold heading or by hot forging.
If rivets are made by the cold heading process, they shall subsequently be adequately heat treated so that the
stresses set up in the cold heading process are eliminated. If they are made by hot forging process, care shall
be taken to see that the ļ¬nished rivets cool gradually.
7 Types of Rivet Heads
According to Indian standard speciļ¬cations, the rivet heads are classiļ¬ed into the following three types:
1. Rivet heads for general purposes (below 12 mm diameter), according to IS : 2155 - 1982 (Reaļ¬rmed 1996).
Figure 3: Rivet heads for general purposes (below 12 mm diameter).
5. 2. Rivet heads for general purposes (From 12 mm to 48 mm diameter), according to IS : 1929 - 1982 (Reaf-
ļ¬rmed 1996).
Figure 4: Rivet heads for general purposes (from 12 mm to 48 mm diameter)
3. Rivet heads for boiler work (from 12 mm to 48 mm diameter, according to IS : 1928 - 1961 (Reaļ¬rmed
1996).
Figure 5: Rivet heads for boiler work.
The snap heads are usually employed for structural work and machine riveting. The counter sunk heads are
mainly used for ship building where ļ¬ush surfaces are necessary. The conical heads (also known as conoidal
6. heads) are mainly used in case of hand hammering. The pan heads have maximum strength, but these are
diļ¬cult to shape.
8 Types of Riveted Joints
Following are the two types of riveted joints, depending upon the way in which the plates are connected.
1. Lap joint, and
2. Butt joint.
9 Lap Joint
A lap joint is that in which one plate overlaps the other and the two plates are then riveted together.
10 Butt Joint
A butt joint is that in which the main plates are kept in alignment butting (i.e.touching) each other and a cover
plate (i.e.strap) is placed either on one side or on both sides of the main plates. The cover plate is then riveted
together with the main plates. Butt joints are of the following two types :
1. Single strap butt joint, the edges of the main plates butt against each other and only one cover plate
is placed on one side of the main plates and then riveted together.
2. Double strap butt joint, the edges of the main plates butt against each other and two cover plates are
placed on both sides of the main plates and then riveted together.
Figure 6: Single and double riveted lap joints.
7. Figure 7: Triple riveted lap joint.
Figure 8: Single riveted double strap butt joint.
9. Figure 11: Triple riveted double strap (unequal) butt joint.
11 Important Terms Used in Riveted Joints
The following terms in connection with the riveted joints are important from the subject point of view :
1. Pitch. It is the distance from the center of one rivet to the center of the next rivet measured parallel to
the seam. It is usually denoted by p.
2. Back pitch. It is the perpendicular distance between the center lines of the successive rows. It is usually
denoted by pb.
3. Diagonal pitch. It is the distance between the centers of the rivets in adjacent rows of zig-zag riveted
joint. It is usually denoted by pd.
4. Margin or marginal pitch. It is the distance between the center of rivet hole to the nearest edge of
the plate. It is usually denoted by m.
12 Caulking and Fullering
In order to make the joints leak proof or ļ¬uid tight in pressure vessels like steam boilers, air receivers and tanks
etc. a process known as caulking is employed. In this process, a narrow blunt tool called caulking tool, about
5 mm thick and 38 mm in breadth, is used. The edge of the tool is ground to an angle of 80o
. The tool is moved
after each blow along the edge of the plate, which is planed to a bevel of 75o
to 80o
to facilitate the forcing down
of edge. It is seen that the tool burrs down the plate at A forming a metal to metal joint. In actual practice,
both the edges at A and B are caulked. The head of the rivets as shown at C are also turned down with a
caulking tool to make a joint steam tight. A great care is taken to prevent injury to the plate below the tool.
A more satisfactory way of making the joints staunch is known as fullering which has largely superseded
caulking. In this case, a fullering tool with a thickness at the end equal to that of the plate is used in such
a way that the greatest pressure due to the blows occur near the joint, giving a clean ļ¬nish, with less risk of
damaging the plate.
10. Figure 12: Caulking and fullering.
13 Failures of a Riveted Joint
A riveted joint may fail in the following ways :
1. Tearing of the plate at an edge.
A joint may fail due to tearing of the plate at an edge. This can be avoided by keeping the margin,
m = 1.5d
Figure 13: Tearing of the plate at an edge.
2. Tearing of the plate across a row of rivets.
We know that tearing area per pitch length,
A = (p ā d)t
ā“ Tearing resistance or pull required to tear oļ¬ the plate per pitch length,
Pt = At Ļt = (p ā d) t Ļt
When the tearing resistance (Pt) is greater than the applied load (P) per pitch length, then this type of
failure will not occur.
Figure 14: Tearing of the plate across the rows of rivets.
11. 3. Shearing of the rivets.
We know that shearing area,
As =
Ļ
4
d2
...(In single shear)
= 2
Ļ
4
d2
...(Theoretically, in double shear)
= 1.875
Ļ
4
d2
...(In double shear, according to Indian Boiler Regulations)
ā“ Shearing resistance or pull required to shear oļ¬ the rivet per pitch length,
Ps = n
Ļ
4
d2
Ļ ...(In single shear)
= 2 n
Ļ
4
d2
Ļ ...(Theoretically, in double shear)
= 1.875 n
Ļ
4
d2
Ļ ...(In double shear, according to Indian Boiler Regulations)
When the shearing resistance (Ps) is greater than the applied load (P) per pitch length, then this type of
failure will occur.
Figure 15: Shearing of rivets.
Figure 16: Shearing oļ¬ a rivet in double cover butt joint.
4. Crushing of the plate or rivets.
We know that crushing area per rivet (i.e.projected area per rivet),
Ac = d t
ā“ Total crushing area = n d t and crushing resistance or pull required to crush the rivet per pitch length,
Pc = n d t Ļc
When the crushing resistance (Pc) is greater than the applied load (P) per pitch length, then this type of
failure will occur.
Note: The number of rivets under shear shall be equal to the number of rivets under crushing.
12. Figure 17: Shearing oļ¬ a rivet in double cover butt joint.
14 Strength of a Riveted Joint
The strength of a joint may be deļ¬ned as the maximum force, which it can transmit, without causing it to fail.
We have that Pt , Ps and Pc are the pulls required to tear oļ¬ the plate, shearing oļ¬ the rivet and crushing oļ¬
the rivet. A little consideration will show that if we go on increasing the pull on a riveted joint, it will fail when
the least of these three pulls is reached, because a higher value of the other pulls will never reach since the joint
has failed, either by tearing oļ¬ the plate, shearing oļ¬ the rivet or crushing oļ¬ the rivet.
If the joint is continuous as in case of boilers, the strength is calculated per pitch length. But if the joint
is small, the strength is calculated for the whole length of the plate.
15 Eļ¬ciency of a Riveted Joint
The eļ¬ciency of a riveted joint is deļ¬ned as the ratio of the strength of riveted joint to the strength of the
un-riveted or solid plate. We have already discussed that strength of the riveted joint
= Least of Pt, Ps and Pc
Strength of the un-riveted or solid plate per pitch length,
P = p t Ļt
ā“ Eļ¬ciency of the riveted joint,
Ī· =
Least of Pt, Ps and Pc
p t Ļt
16 Design of Boiler Joints
The boiler has a longitudinal joint as well as circumferential joint. The longitudinal joint is used to join the
ends of the plate to get the required diameter of a boiler. For this purpose, a butt joint with two cover plates
is used. The circumferential joint is used to get the required length of the boiler. For this purpose, a lap
joint with one ring overlapping the other alternately is used.
Since a boiler is made up of number of rings, therefore the longitudinal joints are staggered for convenience of
connecting rings at places where both longitudinal and circumferential joints occur.
17 Assumptions in Designing Boiler Joints
The following assumptions are made while designing a joint for boilers :
1. The load on the joint is equally shared by all the rivets. The assumption implies that the shell and plate
are rigid and that all the deformation of the joint takes place in the rivets themselves.
2. The tensile stress is equally distributed over the section of metal between the rivets.
3. The shearing stress in all the rivets is uniform.
4. The crushing stress is uniform.
5. There is no bending stress in the rivets.
6. The holes into which the rivets are driven do not weaken the member.
7. The rivet ļ¬lls the hole after it is driven.
8. The friction between the surfaces of the plate is neglected.
13. 18 Design of Longitudinal Butt Joint for a Boiler
According to Indian Boiler Regulations (I.B.R), the following procedure should be adopted for the design of
longitudinal butt joint for a boiler.
1. Thickness of boiler shell.
t =
P D
2 Ļt Ī·l
+ 1 mm as corrosion allowance
The following points may be noted :
(a) The thickness of the boiler shell should not be less than 7 mm.
(b) The eļ¬ciency of the joint may be taken from the following table.
(c) Indian Boiler Regulations (I.B.R.) allow a maximum eļ¬ciency of 85% for the best joint. (c) According
to I.B.R., the factor of safety should not be less than 4. The following table shows the values of factor
of safety for various kind of joints in boilers.
2. Diameter of rivets.
using Unwinās empirical formula,
d = 6
ā
t ...(when t is greater than 8 mm)
But if the thickness of plate is less than 8 mm, then the diameter of the rivet hole may be calculated by
equating the shearing resistance of the rivets to crushing resistance. In no case, the diameter of rivet hole
should not be less than the thickness of the plate, because there will be danger of punch crushing. The
following table gives the rivet diameter corresponding to the diameter of rivet hole as per IS : 1928 1961
(Reaļ¬rmed 1996).
14.
15. 3. Pitch of rivets.
The pitch of the rivets is obtained by equating the tearing resistance of the plate to the shearing resistance
of the rivets. It may noted that
(a) The pitch of the rivets should not be less than 2d, which is necessary for the formation of head.
(b) The maximum value of the pitch of rivets for a longitudinal joint of a boiler as per I.B.R. is
Pmax = C t + 41.28 mm
Note: If the pitch of rivets as obtained by equating the tearing resistance to the shearing resistance is
more than pmax , then the value of pmax is taken.
4. Distance between the rows of rivets.
The distance between the rows of rivets as speciļ¬ed by Indian Boiler Regulations is as follows :
(a) For equal number of rivets in more than one row for lap joint or butt joint, the distance between the
rows of rivets (pb) should not be less than
0.33 p + 0.67 d, for zig-zig riveting, and
2d, for chain riveting.
(b) For joints in which the number of rivets in outer rows is half the number of rivets in inner rows and
if the inner rows are chain riveted, the distance between the outer rows and the next rows should not
be less than
0.33 p + 0.67 or 2 d, whichever is greater.
The distance between the rows in which there are full number of rivets shall not be less than 2d.
(c) For joints in which the number of rivets in outer rows is half the number of rivets in inner rows and
if the inner rows are zig-zig riveted, the distance between the outer rows and the next rows shall not
be less than 0.2 p + 1.15 d. The distance between the rows in which there are full number of rivets
(zig-zag) shall not be less than 0.165 p + 0.67 d.
Note: In the above discussion, pis the pitch of the rivets in the outer rows.
5. Thickness of butt strap.
According to I.B.R., the thicknesses for butt strap (t1) are as given below :
(a) The thickness of butt strap, in no case, shall be less than 10 mm
(b)
t1 = 1.125 t, for ordinary (chain riveting) single butt strap.
t1 = 1.125 t
p ā d
p ā 2d
, for single butt straps, every alternate rivet in outer rows being omitted.
t1 = 0.625 t, for double butt-straps of equal width having ordinary riveting (chain riveting).
t1 = 0.625 t
p ā d
p ā 2d
, for double butt straps of equal width having every alternate rivet in the
outer rows being omitted.
16. 6. For unequal width of butt straps, the thicknesses of butt strap are
t1 = 0.75 t, for wide strap on the inside, and
t2 = 0.625 t, for narrow strap on the outside.
7. Margin.
The margin (m) is taken as 1.5 d.
Note : The above procedure may also be applied to ordinary riveted joints.
19 Design of Circumferential Lap Joint for a Boiler
The following procedure is adopted for the design of circumferential lap joint for a boiler.
1. Thickness of the shell and diameter of rivets.
The thickness of the boiler shell and the diameter of the rivet will be same as for longitudinal joint.
2. Number of rivets.
Since it is a lap joint, therefore the rivets will be in single shear. ā“ Shearing resistance of the rivets,
Ps = n
Ļ
4
d2
Ļ
Knowing the inner diameter of the boiler shell (D), and the pressure of steam (P), the total shearing load
acting on the circumferential joint,
Ws =
Ļ
4
D2
P
n
Ļ
4
d2
Ļ =
Ļ
4
D2
P
ā“ n =
D
d
2
P
Ļ
3. Pitch of rivets.
If the eļ¬ciency of the longitudinal joint is known, then the eļ¬ciency of the circumferential joint may be
obtained. It is generally taken as 50% of tearing eļ¬ciency in longitudinal joint, but if more than one
circumferential joints is used, then it is 62% for the intermediate joints. Knowing the eļ¬ciency of the
circumferential lap joint (Ī·c), the pitch of the rivets for the lap joint (p1) may be obtained by using the
relation :
Ī·c =
p1 ā d
p1
4. Number of rows.
Number of rows =
Total number of rivets
Number of rivets in one row
and the number of rivets in one row
=
Ļ (D + t)
p1
5. After ļ¬nding out the number of rows, the type of the joint (i.e. single riveted or double riveted etc.) may
be decided. Then the number of rivets in a row and pitch may be re-adjusted. In order to have a leak-proof
joint, the pitch for the joint should be checked from Indian Boiler Regulations.
6. The distance between the rows of rivets (i.e. back pitch) is calculated by using the relations as discussed
in the previous article.
7. After knowing the distance between the rows of rivets (pb), the overlap of the plate may be ļ¬xed by using
the relation,
Overlap = (No. of rows of rivets - 1) pb + m
17. 20 Recommended Joints for Pressure Vessels
The following table shows the recommended joints for pressure vessels.
21 Riveted Joint for Structural Use-Joints of Uniform Strength (Lozenge Joint)
A riveted joint known as Lozenge joint used for roof, bridge work or girders etc. In such a joint, diamond
riveting is employed so that the joint is made of uniform strength.
In designing a Lozenge joint, the following procedure is adopted.
1. Diameter of rivet.
Using Unwinās formula,
d = 6
ā
t
18. 2. Number of rivets.
Pt = (b ā d) t Ļt
Since the joint is double strap butt joint, therefore the rivets are in double shear. It is assumed that
resistance of a rivet in double shear is 1.75 times than in single shear in order to allow for possible
eccentricity of load and defective workmanship.
ā“ Shearing resistance of one rivet,
Ps = 1.75
Ļ
4
d2
Ļ
and crushing resistance of one rivet,
Pc = d t Ļc
ā“ Number of rivets required for the joint,
n =
Pt
Least of Ps or Pc
3. From the number of rivets, the number of rows and the number of rivets in each row is decided.
4. Thickness of the butt straps.
The thickness of the butt strap,
t1 = 1.25 t, for single cover strap
= 0.75 t, for double cover strap
5. Eļ¬ciency of the joint First of all, calculate the resistances along the sections 1-1, 2-2 and 3-3.
At section 1-1, there is only one rivet hole.
ā“ Resistance of the joint in tearing along 1-1,
Pt1 = (b ā d) t Ļt
At section 2-2, there are two rivet holes.
ā“ Resistance of the joint in tearing along 2-2,
Pt1 = (b ā 2d) t Ļt + Strength of one rivet in front of section 2-2
(This is due to the fact that for tearing oļ¬ the plate at section 2-2, the rivet in front of section 2-2 i.e.at
section 1-1 must ļ¬rst fracture).
Similarly at section 3-3 there are three rivet holes.
ā“ Resistance of the joint in tearing along 3-3,
Pt1 = (b ā 3d) t Ļt + Strength of one rivet in front of section 3-3
The least value of Pt1, Pt2, Pt3, Ps or Pc is the strength of the joint.
We know that the strength of unriveted plate,
P = b t Ļt
ā“ Eļ¬ciency of the joint,
Ī· =
Least of Pt1, Pt2, Pt3, Ps or Pc
P
19. Note: The permissible stresses employed in structural joints are higher than those used in design of
pressure vessels. The following values are usually adopted.
For plates in tension ... 140 MPa
For rivets in shear ... 105 MPa
For crushing of rivets and plates
Single shear ... 224 MPa
Double shear ... 280 MPa
6. The pitch of the rivets is obtained by equating the strength of the joint in tension to the strength of the
rivets in shear. The pitches allowed in structural joints are larger than those of pressure vessels. The
following table shows the values of pitch due to Rotscher.
7. The marginal pitch (m) should not be less than 1.5 d.
8. The distance between the rows of rivets is 2.5 d to 3 d.
22 Eccentric Loaded Riveted Joint
When the line of action of the load does not pass through the centroid of the rivet system and thus all rivets
are not equally loaded, then the joint is said to be an eccentric loaded riveted joint. The eccentric loading
20. results in secondary shear caused by the tendency of force to twist the joint about the center of gravity in
addition to direct shear or primary shear.
Let
P = Eccentric load on the joint
The following procedure is adopted for the design of an eccentrically loaded riveted joint.
1. First of all, ļ¬nd the center of gravity G of the rivet system.
x =
A1x1 + A2x2 + A3x3 + ...
A1 + A2 + A3 + ...
A1x1 + A2x2 + A3x3 + ...
nA
=
x1 + x2 + x3 + ...
n
y =
y1 + y2 + y3 + ...
n
2. Introduce two forces P1 and P2 at the center of gravity G of the rivet system. These forces are equal and
opposite to P.
3. Assuming that all the rivets are of the same size, the eļ¬ect of P1 = P is to produce direct shear load on
each rivet of equal magnitude. Therefore, direct shear load on each rivet,
Ps =
P
n
, acting parallel to the load P
4. The eļ¬ect of P2 = P is to produce a turning moment of magnitude P x e which tends to rotate the joint
about the center of gravity G of the rivet system in a clockwise direction. Due to the turning moment,
secondary shear load on each rivet is produced. In order to ļ¬nd the secondary shear load, the following
two assumptions are made :
(a) The secondary shear load is proportional to the radial distance of the rivet under consideration from
the center of gravity of the rivet system.
(b) The direction of secondary shear load is perpendicular to the line joining the center of the rivet to the
center of gravity of the rivet system.
From assumption (a),
F1 ā l1; F2 ā l2 and so on
or
F1
l1
=
F2
l2
=
F3
l3
= ...
ā“ F2 = F1
l2
l1
, and F3 = F1
l3
l1
We know that the sum of the external turning moment due to the eccentric load and of internal resisting
moment of the rivets must be equal to zero.
ā“ P e = F1l1 + F2l2 + F3l3 + ...
= F1l1 + F1
l2
l1
l2 + F1
l3
l1
l3 + ...
=
F1
l1
l2
1 + l2
2 + l2
3 + ...
From the above expression, the value of F1 may be calculated and hence F2 and F3 etc. are known. The
direction of these forces are at right angles to the lines joining the center of rivet to the center of gravity
of the rivet system and should produce the moment in the same direction (i.e.clockwise or anticlockwise)
about the center of gravity, as the turning moment (P x e).
5. The primary (or direct) and secondary shear load may be added vectorially to determine the resultant
shear load (R) on each rivet. It may also be obtained by using the relation
R = P2
s + F2 + 2PsF cos Īø
When the secondary shear load on each rivet is equal, then the heavily loaded rivet will be one in which the
included angle between the direct shear load and secondary shear load is minimum. The maximum loaded
rivet becomes the critical one for determining the strength of the riveted joint. Knowing the permissible
shear stress (Ļ), the diameter of the rivet hole may be obtained by using the relation,
Maximum resultant shear load (R) =
Ļ
4
d2
Ļ
21. Figure 18: Eccentric loaded riveted joint.
Notes:
1. In the solution of a problem, the primary and shear loads may be laid oļ¬ approximately to scale and
generally the rivet having the maximum resultant shear load will be apparent by inspection. The values
of the load for that rivet may then be calculated.
2. When the thickness of the plate is given, then the diameter of the rivet hole may be checked against
crushing.
3. When the eccentric load P is inclined at some angle, then the same procedure as discussed above may be
followed to ļ¬nd the size of rivet