机械工程设计 第7版 改编版PDF电子书下载

1 Introduction 1

1-1 Design 2

1-2 Mechanical Engineering Design 4

1-3 Interaction between Design Process Elements 9

1-4 Design Tools and Resources 12

1-5 The Design Engineer’s Professional Responsibilities 14

1-6 Codes and Standards 16

1-7 Economics 18

1-8 Safety and Product Liability 20

1-9 The Adequacy Assessment 20

1-10 Uncertainty 22

1-11 Stress and Strength 23

1-12 Design Factor and Factor of Safety 27

1-13 Reliability 28

1-14 Units and Preferred Units 29

1-15 Calculations and Significant Figures 32

Problems 33

2 Failture Resulting from Static Loading 39

2-1 Static Strength 45

2-2 Stress Concentration 45

2-3 Failure Theories 47

2-4 Maximum-Shear-Stress Theory for Ductile Materials 49

2-5 Distortion-Energy Theory for Ductile Materials 50

2-6 Coulomb-Mohr Theory for Ductile Materials 56

2-7 Failure of Ductile Materials Summary 59

2-8 Maximum-Normal-Stress Theory for Brittle Materials 63

2-9 Modifications of the Mohr Theory for Brittle Materials 64

2-10 Failure of Brittle Materials Summary 67

2-11 Selection of Failure Criteria 68

2-12 Static or Quasi-Static Loading on a Shaft 68

2-13 Introduction to Fracture Mechanics 71

2-14 Stochastic Analysis 81

Problems 88

3 Fatigue Failture Resulting from Variable Loading 97

3-1 Introduction to Fatigue in Metals 98

3-2 Approach to Fatigue Failure in Analysis and Design 104

3-3 Fatigue-Life Methods 106

3-4 The Stress-Life Method 106

3-5 The Strain-Life Method 109

3-6 The Linear-Elastic Fracture Mechanics Method 113

3-7 The Endurance Limit 117

3-8 Fatigue Strength 119

3-9 Endurance Limit Modifying Factors 122

3-10 Stress Concentration and Notch Sensitivity 130

3-11 Characterizing Fluctuating Stresses 139

3-12 Fatigue Failure Criteria for Fluctuating Stress 142

3-13 Torsional Fatigue Strength under Fluctuating Stresses 158

3-14 Combinations of Loading Modes 159

3-15 Varying，Fluctuating Stresses； Cumulative Fatigue Damage 162

3-16 Surface Fatigue Strength 169

3-17 Stochastic Analysis 172

Problems 188

4 Flexible Mechanical Elements 197

4-1 Belts 198

4-2 Flat-and Round-Belt Drives 202

4-3 V Belts 219

4-4 Timing Belts 228

4-5 Roller Chain 229

4-6 Wire Rope 238

4-7 Flexible Shafts 247

Problems 248

5 Gears—Force Analysis 257

5-1 Force Analysis—Spur Gearing 258

5-2 Force Analysis—Bevel Gearing 261

5-3 Force Analysis—Helical Gearing 264

5-4 Force Analysis—Worm Gearing 266

Problems 272

6 Spur and Helical Gears 280

6-1 The Lewis Bending Equation 284

6-2 Surface Durability 292

6-3 AGMA Stress Equations 294

6-4 AGMA Strength Equations 296

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

6-6 The Elastic Coefficient Cp （ZE） 306

6-7 Dynamic Factor Kv 306

6-8 Overload Factor Ko 308

6-9 Surface Condition Factor Cf （ZR） 308

6-10 Size Factor Ks 309

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

6-12 Hardness-Ratio Factor CH 311

6-13 Stress Cycle Life Factors YN and ZN 312

6-14 Reliability Factor KR （ Yz ） 313

6-15 Temperature Factor KT （ Yθ） 314

6-16 Rim-Thickness Factor KB 314

6-17 Safety Factors SF and SH 315

6-18 Analysis 318

6-19 Design of a Gear Mesh 327

Problems 332

7 Bevel and Worm Gears 338

7-1 Bevel Gearing-General 339

7-2 Bevel-Gear Stresses and Strengths 341

7-3 AGMA Equation Factors 346

7-4 Straight-Bevel Gear Analysis 358

7-5 Design of a Straight-Bevel Gear Mesh 361

7-6 Worm Gearing—AGMA Equation 365

7-7 Worm-Gear Analysis 368

7-8 Designing a Worm-Gear Mesh 373

7-9 Buckingham Wear Load 377

Problems 378

8 Lubrication and Journal Bearings 383

8-1 Types of Lubrication 384

8-2 Viscosity 385

8-3 Petroff’s Equation 388

8-4 Stable Lubrication 389

8-5 Thick-Film Lubrication 390

8-6 Hydrodynamic Theory 392

8-7 Design Considerations 396

8-8 The Relations of the Variables 399

8-9 Steady-State Conditions in Self-Contained Bearings 412

8-10 Clearance 416

8-11 Pressure-Fed Bearings 418

8-12 Loads and Materials 425

8-13 Bearing Types 427

8-14 Thrust Bearings 428

8-15 Boundary-Lubricated Bearings 429

Problems 440

9 Rolling-Contact Bearings 445

9-1 Bearing Types 447

9-2 Bearing Life 450

9-3 Bearing Load Life at Rated Reliability 450

9-4 Bearing Survival：Reliability versus Life 452

9-5 Relating Load，Life，and Reliability 454

9-6 Combined Radial and Thrust Loading 455

9-7 Variable Loading 462

9-8 Selection of Ball and Cylindrical Roller Bearings 466

9-9 Selection of Tapered Roller Bearings 469

9-10 Design Assessment for Selected Rolling-Contact Bearings 481

9-11 Lubrication 486

9-12 Mounting and Enclosure 487

Problems 491

10 Shafts and Axles 498

10-1 Introduction 499

10-2 Geometric Constraints 504

10-3 Strength Constraints 510

10-4 Strength Constraints—Additional Methods 518

10-5 Shaft Materials 521

10-6 Hollow Shafts 522

10-7 Critical Speeds 522

10-8 Shaft Design 529

Problems 530

11 Screws，Fasteners，and the Design of Nonpermanent Joints 540

11-1 Thread Standards and Definitions 541

11-2 The Mechanics of Power Screws 545

11-3 Threaded Fasteners 554

11-4 Joints—Fastener Stiffness 557

11-5 Joints—Member Stiffness 559

11-6 Bolt Strength 563

11-7 Tension Joints—The External Load 568

11-8 Relating Bolt Torque to Bolt Tension 569

11-9 Statically Loaded Tension Joint with Preload 573

11-10 Gasketed Joints 577

11-11 Fatigue Loading of Tension Joints 577

11-12 Shear Joints 584

11-13 Setscrews 590

11-14 Keys and Pins 592

11-15 Stochastic Considerations 600

Problems 601

12 Clutches，Brakes，Couplings，and Flywheels 618

12-1 Static Analysis of Clutches and Brakes 620

12-2 Internal Expanding Rim Clutches and Brakes 625

12-3 External Contracting Rim Clutches and Brakes 635

12-4 Band-Type Clutches and Brakes 639

12-5 Frictional-Contact Axial Clutches 640

12-6 Disk Brakes 644

12-7 Cone Clutches and Brakes 649

12-8 Energy Considerations 651

12-9 Temperature Rise 653

12-10 Friction Materials 657

12-11 Miscellaneous Clutches and Couplings 660

12-12 Flywheels 662

Problems 668

13 Mechanical Springs 677

13-1 Stresses in Helical Springs 678

13-2 The Curvature Effect 679

13-3 Deflection of Helical Springs 680

13-4 Compression Springs 681

13-5 Stability 682

13-6 Spring Materials 683

13-7 Helical Compression Spring Design for Static Service 689

13-8 Critical Frequency of Helical Springs 696

13-9 Fatigue Loading of Helical Compression Springs 698

13-10 Helical Compression Spring Design for Fatigue Loading 702

13-11 Extension Springs 705

13-12 Helical Coil Torsion Springs 714

13-13 Belleville Springs 721

13-14 Miscellaneous Springs 722

13-15 Summary 724

Problems 725

Appendix A Useful Tables 732

Appendix B Answers to Selected Problems 789