Bart Raeymaekers

Design of Mechanical Elements (eBook, PDF)

A Concise Introduction to Mechanical Design Considerations and Calculations

• Format: PDF

Produktbeschreibung

Provides a student-friendly approach for building the skills required to perform mechanical design calculations Design of Mechanical Elements offers an accessible introduction to mechanical design calculations. Written for students encountering the subject for the first time, this concise textbook focuses on fundamental concepts, problem solving, and methodical calculations of common mechanical components, rather than providing a comprehensive treatment of a wide range of components. Each chapter contains a brief overview of key terminology, a clear explanation of the physics underlying the topic, and solution procedures for typical mechanical design and verification problems. The textbook is divided into three sections, beginning with an overview of the mechanical design process and coverage of basic design concepts including material selection, statistical considerations, tolerances, and safety factors. The next section discusses strength of materials in the context of design of mechanical elements, illustrating different types of static and dynamic loading problems and their corresponding failure criteria. In the concluding section, students learn to combine and apply these concepts and techniques to design specific mechanical elements including shafts, bolted and welded joints, bearings, and gears. * Provides a systematic "recipe" students can easily apply to perform mechanical design calculations * Illustrates theoretical concepts and procedures for solving mechanical design problems with numerous solved examples * Presents easy-to-understand explanations of the considerations and assumptions central to mechanical design * Includes end-of-chapter practice problems that strengthen the understanding of calculation techniques Supplying the basic skills and knowledge necessary for methodically performing basic mechanical design calculations, Design of Mechanical Elements: A Concise Introduction to Mechanical Design Considerations and Calculations is the perfect primary textbook for single-semester undergraduate mechanical design courses.

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Produktdetails

• Verlag: John Wiley & Sons
• Seitenzahl: 256
• Erscheinungstermin: 25. Januar 2022
• Englisch
• ISBN-13: 9781119849957
• Artikelnr.: 63362588

Autorenporträt

Bart Raeymaekers is a Professor in the Department of Mechanical Engineering at the University of Utah, USA. His research focuses on tribology and engineered materials manufacturing and he teaches courses in mechanical design. He is an ASME Fellow and has been a multi-year recipient of the University of Utah, Department of Mechanical Engineering, Outstanding Teaching Award.

Inhaltsangabe

About the author xi

Preface xiii

About the Companion Site xv

1 Mechanical Design 1

1.1 Introduction 1

1.2 Mechanical Design Process 1

1.3 Mechanical Elements 4

1.4 Standards and Codes 4

1.5 Uncertainty in Mechanical Design 5

1.6 Design for Safety 9

1.7 Key Takeaways 9

1.8 Problems 10

2 Material Selection 13

2.1 Introduction 13

2.2 Material Classification 13

2.3 Mechanical Properties 14

2.3.1 Strength and Stiffness 14

2.3.2 Elastic Versus Plastic Strain 16

2.3.3 Resilience 17

2.3.4 Toughness 18

2.3.5 Engineering Stress-Strain Diagram Summary 19

2.3.6 True Stress-Strain Diagram 19

2.4 Materials Processing 20

2.4.1 Hot Versus Cold Processing 20

2.4.2 HotWorking 21

2.4.3 ColdWorking 21

2.4.3.1 Process 21

2.4.3.2 Reduction in Area 22

2.4.3.3 ColdWork Factor 23

2.4.3.4 Modifying Material Properties Using ColdWork 23

2.5 Alloys 26

2.5.1 Numbering Systems 26

2.5.2 Plain Carbon Steels 27

2.5.3 Alloy Steels 28

2.6 Key Takeaways 28

2.7 Problems 29

3 Statistical Considerations 33

3.1 Introduction 33

3.2 Random Variables and Distributions 33

3.3 Density Functions 34

3.3.1 Probability Density Function 34

3.3.2 Cumulative Density Function 34

3.4 Metrics to Describe a Distribution 35

3.5 Linear Combination of Random Variables 37

3.6 Types of Distributions 39

3.6.1 Uniform Distribution 39

3.6.2 Normal Distribution 41

3.6.3 Weibull Distribution 45

3.7 Key Takeaways 48

3.8 Problems 48

4 Tolerances 53

4.1 Introduction 53

4.2 Terminology 53

4.3 Preferred Fits and Tolerances 55

4.3.1 ISO 286 Method 55

4.3.2 Unit Shaft and Unit Hole System 59

4.4 Tolerance Stacks 60

4.5 Key Takeaways 63

4.6 Problems 64

5 Design for Static Strength 69

5.1 Introduction 69

5.2 Simple Loading 70

5.2.1 Axial Loading 70

5.2.2 Bending 71

5.2.3 Torsion 72

5.3 Stress Concentrations 73

5.4 Failure Criteria 79

5.4.1 Failure Criteria for Ductile Materials 79

5.4.1.1 Maximum Normal Stress Theory (Rankine) 79

5.4.1.2 Maximum Shear Stress Theory (Tresca) 79

5.4.1.3 Distortion Energy Theory (Von Mises) 80

5.4.1.4 Comparison Between Different Failure Criteria 81

5.4.2 Failure Criteria for Brittle Materials 82

5.4.2.1 Maximum Normal Stress Theory (Rankine) 82

5.4.2.2 Coulomb-Mohr Theory 83

5.4.2.3 Comparison Between Different Failure Criteria 83

5.5 Key Takeaways 85

5.6 Problems 85

6 Design for Fatigue Strength 91

6.1 Introduction 91

6.1.1 Types of Dynamic Loads 91

6.1.2 Fatigue Failure Mechanism 92

6.2 Fatigue-life Methods 93

6.3 Fatigue Strength 95

6.4 Endurance-limit Modifying Factors 96

6.4.1 ka: Surface Factor 97

6.4.2 kb: Size Factor 97

6.4.3 kc: Load Factor 98

6.4.4 kd: Temperature Factor 99

6.4.5 ke: Reliability Factor 99

6.4.6 kf : Miscellaneous Effects Factor 100

6.5 Fluctuating Stresses 101

6.6 Stress Concentrations 105

6.7 Key Takeaways 106

6.8 Problems 106

7 S