TAILIEUCHUNG - Fundamentals of Machine Design P27

Rivets as permanent joints: Often small machine components are joined together to form a larger machine part. Design of joints is as important as that of machine components because a weak joint may spoil the utility of a carefully designed machine part. Mechanical joints are broadly classified into two classes viz., nonpermanent joints and permanent joints. Non-permanent joints can be assembled and dissembled without damaging the components. | Module 10 Design of Permanent Joints Version 2 ME IIT Kharagpur Lesson 1 Riveted Joints Types and Uses Version 2 ME IIT Kharagpur Instructional Objectives At the end of this lesson the students should be able to know Basic types of riveted joints. Different important design parameters of a riveted joint. Uses of riveted joints. 1. Rivets as permanent joints Often small machine components are joined together to form a larger machine part. Design of joints is as important as that of machine components because a weak joint may spoil the utility of a carefully designed machine part. Mechanical joints are broadly classified into two classes viz. nonpermanent joints and permanent joints. Non-permanent joints can be assembled and dissembled without damaging the components. Examples of such joints are threaded fasteners like screw-joints keys and couplings etc. Permanent joints cannot be dissembled without damaging the components. These joints can be of two kinds depending upon the nature of force that holds the two parts. The force can be of mechanical origin for example riveted joints joints formed by press or interference fit etc where two components are joined by applying mechanical force. The components can also be joined by molecular force for example welded joints brazed joints joints with adhesives etc. Not until long ago riveted joints were very often used to join structural members permanently. However significant improvement in welding and bolted joints has curtained the use of these joints. Even then rivets are used in structures ship body bridge tanks and shells where high joint strength is required. Version 2 ME IIT .

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