Page 9 - Analysis and Design of Machine Elements

3.3 Threaded Fastening Methods 64 Contents vii
3.3.1 Types of Threaded Fastening Methods 64
3.3.2 Threaded Fasteners 65
3.3.3 Tightening Torque and Preloading 66
3.3.4 Fastener Loosening and Locking 66
3.4 Force Analysis of Multiply Bolted Joints 67
3.4.1 Multiply Bolted Joints Subjected to Symmetric Transverse Loads 67
3.4.2 Multiply Bolted Joints Subjected to a Torque 68
3.4.3 Multiply Bolted Joints Subjected to a Symmetric Axial Load 69
3.4.4 Multiply Bolted Joints Subjected to an Overturning Moment 70
3.5 Strength Analysis 71
3.5.1 Potential Failure Modes 71
3.5.2 Strength Analysis for Shear Bolts 71
3.5.3 Strength Analysis for Tension Bolts 72
3.5.3.1 Tension Bolts Subjected to Axial Loads Only 72
3.5.3.2 Preloaded Tension Bolts Subjected to Transverse Loads 72
3.5.3.3 Preloaded Tension Bolts Subjected to Combined Preload and Static Axial
Loads 73
3.5.3.4 Preloaded Tension Bolts Subjected to Combined Preload and Variable Axial
Loads 74
3.5.4 Measures to Improve Fatigue Strength of Bolted Joints 75
3.6 Design of Bolted Joints 76
3.6.1 Introduction 76
3.6.2 Materials and Allowable Stresses 76
3.6.3 Design Criteria 78
3.6.4 Design Procedure and Guidelines 78
3.6.5 Structural Design 79
3.6.6 Design Cases 79
References 83
Problems 84

4 Detachable Fastenings for Shaft and Hub 91
4.1 Keys 91
4.1.1 Applications, Characteristics and Structure 91
4.1.2 Types of Keys 92
4.1.3 Strength Analysis 94
4.2 Splines 96
4.3 Pins 97
References 98
Problems 99

5 Permanent Connections 105
5.1 Riveting 105
5.1.1 Applications, Characteristics and Structure 105
5.1.2 Types of Rivets 105
5.1.3 Strength Analysis 106
5.1.4 Design of Riveted Joints 107