机械工程设计 第7版 改编版PDF|Epub|txt|kindle电子书版本网盘下载

机械工程设计 第7版 改编版PDF格式电子书版下载

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1 Introduction1

1-1 Design2

1-2 Mechanical Engineering Design4

1-3 Interaction between Design Process Elements9

1-4 Design Tools and Resources12

1-5 The Design Engineer’s Professional Responsibilities14

1-6 Codes and Standards16

1-7 Economics18

1-8 Safety and Product Liability20

1-9 The Adequacy Assessment20

1-10 Uncertainty22

1-11 Stress and Strength23

1-12 Design Factor and Factor of Safety27

1-13 Reliability28

1-14 Units and Preferred Units29

1-15 Calculations and Significant Figures32

Problems33

2 Failture Resulting from Static Loading39

2-1 Static Strength45

2-2 Stress Concentration45

2-3 Failure Theories47

2-4 Maximum-Shear-Stress Theory for Ductile Materials49

2-5 Distortion-Energy Theory for Ductile Materials50

2-6 Coulomb-Mohr Theory for Ductile Materials56

2-7 Failure of Ductile Materials Summary59

2-8 Maximum-Normal-Stress Theory for Brittle Materials63

2-9 Modifications of the Mohr Theory for Brittle Materials64

2-10 Failure of Brittle Materials Summary67

2-11 Selection of Failure Criteria68

2-12 Static or Quasi-Static Loading on a Shaft68

2-13 Introduction to Fracture Mechanics71

2-14 Stochastic Analysis81

Problems88

3 Fatigue Failture Resulting from Variable Loading97

3-1 Introduction to Fatigue in Metals98

3-2 Approach to Fatigue Failure in Analysis and Design104

3-3 Fatigue-Life Methods106

3-4 The Stress-Life Method106

3-5 The Strain-Life Method109

3-6 The Linear-Elastic Fracture Mechanics Method113

3-7 The Endurance Limit117

3-8 Fatigue Strength119

3-9 Endurance Limit Modifying Factors122

3-10 Stress Concentration and Notch Sensitivity130

3-11 Characterizing Fluctuating Stresses139

3-12 Fatigue Failure Criteria for Fluctuating Stress142

3-13 Torsional Fatigue Strength under Fluctuating Stresses158

3-14 Combinations of Loading Modes159

3-15 Varying，Fluctuating Stresses； Cumulative Fatigue Damage162

3-16 Surface Fatigue Strength169

3-17 Stochastic Analysis172

Problems188

4 Flexible Mechanical Elements197

4-1 Belts198

4-2 Flat-and Round-Belt Drives202

4-3 V Belts219

4-4 Timing Belts228

4-5 Roller Chain229

4-6 Wire Rope238

4-7 Flexible Shafts247

Problems248

5 Gears—Force Analysis257

5-1 Force Analysis—Spur Gearing258

5-2 Force Analysis—Bevel Gearing261

5-3 Force Analysis—Helical Gearing264

5-4 Force Analysis—Worm Gearing266

Problems272

6 Spur and Helical Gears280

6-1 The Lewis Bending Equation284

6-2 Surface Durability292

6-3 AGMA Stress Equations294

6-4 AGMA Strength Equations296

6-5 Geometry Factors I and J （ZI and YJ）301

6-6 The Elastic Coefficient Cp （ZE）306

6-7 Dynamic Factor Kv306

6-8 Overload Factor Ko308

6-9 Surface Condition Factor Cf （ZR）308

6-10 Size Factor Ks309

6-11 Load-Distribution Factor Km （KH）309

6-12 Hardness-Ratio Factor CH311

6-13 Stress Cycle Life Factors YN and ZN312

6-14 Reliability Factor KR （ Yz ）313

6-15 Temperature Factor KT （ Yθ）314

6-16 Rim-Thickness Factor KB314

6-17 Safety Factors SF and SH315

6-18 Analysis318

6-19 Design of a Gear Mesh327

Problems332

7 Bevel and Worm Gears338

7-1 Bevel Gearing-General339

7-2 Bevel-Gear Stresses and Strengths341

7-3 AGMA Equation Factors346

7-4 Straight-Bevel Gear Analysis358

7-5 Design of a Straight-Bevel Gear Mesh361

7-6 Worm Gearing—AGMA Equation365

7-7 Worm-Gear Analysis368

7-8 Designing a Worm-Gear Mesh373

7-9 Buckingham Wear Load377

Problems378

8 Lubrication and Journal Bearings383

8-1 Types of Lubrication384

8-2 Viscosity385

8-3 Petroff’s Equation388

8-4 Stable Lubrication389

8-5 Thick-Film Lubrication390

8-6 Hydrodynamic Theory392

8-7 Design Considerations396

8-8 The Relations of the Variables399

8-9 Steady-State Conditions in Self-Contained Bearings412

8-10 Clearance416

8-11 Pressure-Fed Bearings418

8-12 Loads and Materials425

8-13 Bearing Types427

8-14 Thrust Bearings428

8-15 Boundary-Lubricated Bearings429

Problems440

9 Rolling-Contact Bearings445

9-1 Bearing Types447

9-2 Bearing Life450

9-3 Bearing Load Life at Rated Reliability450

9-4 Bearing Survival：Reliability versus Life452

9-5 Relating Load，Life，and Reliability454

9-6 Combined Radial and Thrust Loading455

9-7 Variable Loading462

9-8 Selection of Ball and Cylindrical Roller Bearings466

9-9 Selection of Tapered Roller Bearings469

9-10 Design Assessment for Selected Rolling-Contact Bearings481

9-11 Lubrication486

9-12 Mounting and Enclosure487

Problems491

10 Shafts and Axles498

10-1 Introduction499

10-2 Geometric Constraints504

10-3 Strength Constraints510

10-4 Strength Constraints—Additional Methods518

10-5 Shaft Materials521

10-6 Hollow Shafts522

10-7 Critical Speeds522

10-8 Shaft Design529

Problems530

11 Screws，Fasteners，and the Design of Nonpermanent Joints540

11-1 Thread Standards and Definitions541

11-2 The Mechanics of Power Screws545

11-3 Threaded Fasteners554

11-4 Joints—Fastener Stiffness557

11-5 Joints—Member Stiffness559

11-6 Bolt Strength563

11-7 Tension Joints—The External Load568

11-8 Relating Bolt Torque to Bolt Tension569

11-9 Statically Loaded Tension Joint with Preload573

11-10 Gasketed Joints577

11-11 Fatigue Loading of Tension Joints577

11-12 Shear Joints584

11-13 Setscrews590

11-14 Keys and Pins592

11-15 Stochastic Considerations600

Problems601

12 Clutches，Brakes，Couplings，and Flywheels618

12-1 Static Analysis of Clutches and Brakes620

12-2 Internal Expanding Rim Clutches and Brakes625

12-3 External Contracting Rim Clutches and Brakes635

12-4 Band-Type Clutches and Brakes639

12-5 Frictional-Contact Axial Clutches640

12-6 Disk Brakes644

12-7 Cone Clutches and Brakes649

12-8 Energy Considerations651

12-9 Temperature Rise653

12-10 Friction Materials657

12-11 Miscellaneous Clutches and Couplings660

12-12 Flywheels662

Problems668

13 Mechanical Springs677

13-1 Stresses in Helical Springs678

13-2 The Curvature Effect679

13-3 Deflection of Helical Springs680

13-4 Compression Springs681

13-5 Stability682

13-6 Spring Materials683

13-7 Helical Compression Spring Design for Static Service689

13-8 Critical Frequency of Helical Springs696

13-9 Fatigue Loading of Helical Compression Springs698

13-10 Helical Compression Spring Design for Fatigue Loading702

13-11 Extension Springs705

13-12 Helical Coil Torsion Springs714

13-13 Belleville Springs721

13-14 Miscellaneous Springs722

13-15 Summary724

Problems725

Appendix A Useful Tables732

Appendix B Answers to Selected Problems789