Mechanics of aircraft structuresPDF|Epub|txt|kindle电子书版本网盘下载

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1 Characteristics of Aircraft Structures and Materials1

1.1 Introduction1

1.2 Basic Structural Elements in Aircraft Structure2

1.2.1 Axial Member2

1.2.2 Shear Panel4

1.2.3 Bending Member （Beam）5

1.2.4 Torsion Member7

1.3 Wing and Fuselage8

1.3.1 Load Transfer9

1.3.2 Wing Structure10

1.3.3 Fuselage11

1.4 Aircraft Materials12

Problems17

2 Introduction to Elasticity19

2.1 Concept of Displacement19

2.2 Strain21

2.3 Stress25

2.4 Equations of Equilibrium in a Nonuniform Stress Field28

2.5 Principal Stress31

2.6 Shear Stress34

2.7 Revisit of Transformation of Stress36

2.8 Linear Stress-Strain Relations38

2.8.1 Strains Induced by Normal Stress39

2.8.2 Strains Induced by Shear Stress42

2.8.3 Three-Dimensional Stress-Strain Relations43

2.9 Elastic Strain Energy47

2.10 Plane Elasticity49

2.10.1 Stress-Strain Relations for Plane Isotropic Solids50

2.10.2 Stress-Strain Relations for Orthotropic Solids in Plane Stress53

2.10.3 Governing Equations54

2.10.4 Solution by Airy Stress Function for Plane Isotropic Solids56

Problems57

3 Torsion63

3.1 Saint-Venant’s Principle63

3.2 Torsion of Uniform Bars67

3.3 Bars with Circular Cross-Sections74

3.4 Bars with Narrow Rectangular Cross-Sections77

3.5 Closed Single-Cell Thin-Walled Sections81

3.6 Multicell Thin-Walled Sections91

3.7 Warping in Open Thin-Walled Sections96

3.8 Warping in Closed Thin-Walled Sections101

3.9 Effect of End Constraints103

Problems110

4 Bending and Flexural Shear115

4.1 Derivation of the Simple （Bernoulli-Euler） Beam Equation115

4.2 Bidirectional Bending120

4.3 Transverse Shear Stress due to Transverse Force in Symmetric Sections128

4.3.1 Narrow Rectangular Cross-Section128

4.3.2 General Symmetric Sections130

4.3.3 Thin-Walled Sections132

4.3.4 Shear Deformation in Thin-Walled Sections133

4.4 Timoshenko Beam Theory136

4.5 Shear Lag140

Problems144

5 Flexural Shear Flow in Thin-Walled Sections149

5.1 Flexural Shear Flow in Open Thin-Walled Sections149

5.1.1 Symmetric Thin-Walled Sections150

5.1.2 Unsymmetric Thin-Walled Sections155

5.1.3 Multiple Shear Flow Junctions157

5.1.4 Selection of Shear Flow Contour158

5.2 Shear Center in Open Sections159

5.3 Closed Thin-Walled Sections and Combined Flexural and Torsional Shear Flow165

5.3.1 Shear Center167

5.3.2 Statically Determinate Shear Flow171

5.4 Closed Multicell Sections173

Problems177

6 Failure Criteria for Isotropic Materials183

6.1 Strength Criteria for Brittle Materials183

6.1.1 Maximum Principal Stress Criterion184

6.1.2 Coulomb-Mohr Criterion184

6.2 Yield Criteria for Ductile Materials186

6.2.1 Maximum Shear Stress Criterion （Tresca Yield Criterion） in Plane Stress187

6.2.2 Maximum Distortion Energy Criterion （von Mises Yield Criterion）188

6.3 Fracture Mechanics193

6.3.1 Stress Concentration193

6.3.2 Concept of Cracks and Strain Energy Release Rate194

6.3.3 Fracture Criterion196

6.4 Stress Intensity Factor201

6.4.1 Symmetric Loading （Mode Ⅰ Fracture）201

6.4.2 Antisymmetric Loading （Mode Ⅱ Fracture）204

6.4.3 Relation between K and G206

6.4.4 Mixed Mode Fracture210

6.5 Effect of Crack Tip Plasticity211

6.6 Fatigue Failure214

6.6.1 Constant Stress Amplitude215

6.6.2 S-N Curves215

6.6.3 Variable Amplitude Loading216

6.7 Fatigue Crack Growth217

Problems219

7 Elastic Buckling225

7.1 Eccentrically Loaded Beam-Column225

7.2 Elastic Buckling of Straight Bars227

7.2.1 Pinned-Pinned Bar228

7.2.2 Clamped-Free Bar231

7.2.3 Clamped-Pinned Bar232

7.2.4 Clamped-Clamped Bar234

7.2.5 Effective Length of Buckling235

7.3 Initial Imperfection236

7.4 Postbuckling Behavior238

7.5 Bar of Unsymmetric Section244

7.6 Torsion al-Flexural Buckling of Thin-Walled Bars246

7.6.1 Nonuniform Torsion246

7.6.2 Torsional Buckling of Doubly Symmetric Section248

7.6.3 Torsional-Flexural Buckling251

7.7 Elastic Buckling of Flat Plates256

7.7.1 Governing Equation for Flat Plates256

7.7.2 Cylindrical Bending258

7.7.3 Buckling of Rectangular Plates259

7.7.4 Buckling under Shearing Stresses263

7.8 Local Buckling of Open Sections264

Problems266

8 Analysis of Composite Laminates271

8.1 Plane Stress Equations for Composite Lamina271

8.2 Off-Axis Loading277

8.3 Notation for Stacking Sequence in Laminates280

8.4 Symmetric Laminate under In-Plane Loading282

8.5 Effective Moduli for Symmetric Laminates285

8.6 Laminar Stresses288

8.7 [±45°] Laminate290

Problems292

Index295