كتاب Mechanics of Materials 6th

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Mechanics of Materials
6th txtbk
Ferdinand P. Beer
Late of Lehigh University
E. Russell Johnston, Jr.
Late of University of Connecticut
John T. Dewolf
University of Connecticut
David F. Mazurek
United States Coast Guard Academy

ويتناول الموضوعات الأتية :

1 Introduction—Concept of Stress 2
1.1 Introduction 4
1.2 A Short Review of the Methods of Statics 4
1.3 Stresses in the Members of a Structure 7
1.4 Analysis and Design 8
1.5 Axial Loading; Normal Stress 9
1.6 Shearing Stress 11
1.7 Bearing Stress in Connections 13
1.8 Application to the Analysis and Design of Simple
Structures 13
1.9 Method of Problem Solution 16
1.10 Numerical Accuracy 17
1.11 Stress on an Oblique Plane under Axial Loading 26
1.12 Stress under General Loading Conditions;
Components of Stress 27
1.13 Design Considerations 30
Review and Summary for Chapter 1 42
2 Stress and Strain—Axial
Loading 52
2.1 Introduction 54
2.2 Normal Strain under Axial Loading 55
2.3 Stress-Strain Diagram 57
*2.4 True Stress and True Strain 61
2.5 Hooke’s Law; Modulus of Elasticity 62
2.6 Elastic versus Plastic Behavior of a Material 64
2.7 Repeated Loadings; Fatigue 66
2.8 Deformations of Members under Axial Loading 67
2.9 Statically Indeterminate Problems 78
2.10 Problems Involving Temperature Changes 82
2.11 Poisson’s Ratio 93
2.12 Multiaxial Loading; Generalized Hooke’s Law 94
*2.13 Dilatation; Bulk Modulus 96
2.14 Shearing Strain 98
2.15 Further Discussion of Deformations under Axial Loading;
Relation among E, n, and G 101
*2.16 Stress-Strain Relationships for Fiber-Reinforced Composite
Materials 103
2.17 Stress and Strain Distribution under Axial Loading;
Saint-Venant’s Principle 113
2.18 Stress Concentrations 115
2.19 Plastic Deformations 117
*2.20 Residual Stresses 121
Review and Summary for Chapter 2 129
3 Torsion 140
3.1 Introduction 142
3.2 Preliminary Discussion of the Stresses in a Shaft 144
3.3 Deformations in a Circular Shaft 145
3.4 Stresses in the Elastic Range 148
3.5 Angle of Twist in the Elastic Range 159
3.6 Statically Indeterminate Shafts 163
3.7 Design of Transmission Shafts 176
3.8 Stress Concentrations in Circular Shafts 179
*3.9 Plastic Deformations in Circular Shafts 184
*3.10 Circular Shafts Made of an Elastoplastic Material 186
*3.11 Residual Stresses in Circular Shafts 189
*3.12 Torsion of Noncircular Members 197
*3.13 Thin-Walled Hollow Shafts 200
Review and Summary for Chapter 3 210
4 Pure Bending 220
4.1 Introduction 222
4.2 Symmetric Member in Pure Bending 224
4.3 Deformations in a Symmetric Member in Pure Bending 226
4.4 Stresses and Deformations in the Elastic Range 229
4.5 Deformations in a Transverse Cross Section 233
4.6 Bending of Members Made of Several Materials 242
4.7 Stress Concentrations 246
*4.8 Plastic Deformations 255
*4.9 Members Made of an Elastoplastic Material 256
*4.10 Plastic Deformations of Members with a Single Plane of
Symmetry 260
*4.11 Residual Stresses 261
4.12 Eccentric Axial Loading in a Plane of Symmetry
4.13 Unsymmetric Bending 279 Contents ix
4.14 General Case of Eccentric Axial Loading 284
*4.15 Bending of Curved Members 294
Review and Summary for Chapter 4 305
5 Analysis and Design of Beams for
Bending 314
5.1 Introduction 316
5.2 Shear and Bending-Moment Diagrams 319
5.3 Relations among Load, Shear, and Bending Moment 329
5.4 Design of Prismatic Beams for Bending 339
*5.5 Using Singularity Functions to Determine Shear and Bending
Moment in a Beam 350
*5.6 Nonprismatic Beams 361
Review and Summary for Chapter 5 370
6 Shearing Stresses in Beams and
Thin-Walled Members 380
6.1 Introduction 382
6.2 Shear on the Horizontal Face of a Beam Element 384
6.3 Determination of the Shearing Stresses in a Beam 386
6.4 Shearing Stresses txy in Common Types of Beams 387
*6.5 Further Discussion of the Distribution of Stresses in a
Narrow Rectangular Beam 390
6.6 Longitudinal Shear on a Beam Element of Arbitrary
Shape 399
6.7 Shearing Stresses in Thin-Walled Members 401
*6.8 Plastic Deformations 404
*6.9 Unsymmetric Loading of Thin-Walled Members;
Shear Center 414
Review and Summary for Chapter 6 427
7 Transformations of Stress and
Strain 436
7.1 Introduction 438
7.2 Transformation of Plane Stress 440
7.3 Principal Stresses: Maximum Shearing Stress 443
7.4 Mohr’s Circle for Plane Stress 452
7.5 General State of Stress 462
7.6 Application of Mohr’s Circle to the Three-Dimensional
Analysis of Stress 464
*7.7 Yield Criteria for Ductile Materials under Plane Stress 467
*7.8 Fracture Criteria for Brittle Materials under Plane Stress 469
7.9 Stresses in Thin-Walled Pressure Vessels 478
*7.10 Transformation of Plane Strain 486
*7.11 Mohr’s Circle for Plane Strain 489
*7.12 Three-Dimensional Analysis of Strain 491
*7.13 Measurements of Strain; Strain Rosette 494
Review and Summary for Chapter 7 502
8 Principal Stresses under a Given
Loading 512
*8.1 Introduction 514
*8.2 Principal Stresses in a Beam 515
*8.3 Design of Transmission Shafts 518
*8.4 Stresses under Combined Loadings 527
Review and Summary for Chapter 8 540
9 Deflection of Beams 548
9.1 Introduction 550
9.2 Deformation of a Beam under Transverse Loading 552
9.3 Equation of the Elastic Curve 553
*9.4 Direct Determination of the Elastic Curve from the Load
Distribution 559
9.5 Statically Indeterminate Beams 561
*9.6 Using Singularity Functions to Determine the Slope and
Deflection of a Beam 571
9.7 Method of Superposition 580
9.8 Application of Superposition to Statically Indeterminate
Beams 582
*9.9 Moment-Area Theorems 592
*9.10 Application to Cantilever Beams and Beams with Symmetric
Loadings 595
*9.11 Bending-Moment Diagrams by Parts 597
*9.12 Application of Moment-Area Theorems to Beams with
Unsymmetric Loadings 605
*9.13 Maximum Deflection 607
*9.14 Use of Moment-Area Theorems with Statically Indeterminate
Beams 609
Review and Summary for Chapter 9 618
10 Columns 630
10.1 Introduction 632
10.2 Stability of Structures 632
10.3 Euler’s Formula for Pin-Ended Columns 635
10.4 Extension of Euler’s Formula to Columns with Other End
Conditions 638
*10.5 Eccentric Loading; the Secant Formula 649
10.6 Design of Columns under a Centric Load 660
10.7 Design of Columns under an Eccentric Load 675
Review and Summary for Chapter 10 684
11 Energy Methods 692
11.1 Introduction 694
11.2 Strain Energy 694
11.3 Strain-Energy Density 696
11.4 Elastic Strain Energy for Normal Stresses 698
11.5 Elastic Strain Energy for Shearing Stresses 701
11.6 Strain Energy for a General State of Stress 704
11.7 Impact Loading 716
11.8 Design for Impact Loads 718
11.9 Work and Energy under a Single Load 719
11.10 Deflection under a Single Load by the
Work-Energy Method 722
*11.11 Work and Energy under Several Loads 732
*11.12 Castigliano’s Theorem 734
*11.13 Deflections by Castigliano’s Theorem 736
*11.14 Statically Indeterminate Structures 740
Review and Summary for Chapter 11 750
Appendices A1
A Moments of Areas A2
B Typical Properties of Selected Materials Used in
Engineering A12
C Properties of Rolled-Steel Shapes A16
D Beam Deflections and Slopes A28
E Fundamentals of Engineering Examination A29
Photo Credits C1
Index I1
Answers to Problems An1

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