Mechanics of Aircraft Structures Book

	Preface	xiii
	Preface to the First Edition	xv
1	Characteristics of Aircraft Structures and Materials	1
1.1	Introduction	1
1.2	Basic Structural Elements in Aircraft Structure	2
1.2.1	Axial Member	2
1.2.2	Shear Panel	4
1.2.3	Bending Member (Beam)	5
1.2.4	Torsion Member	7
1.3	Wing and Fuselage	8
1.3.1	Load Transfer	9
1.3.2	Wing Structure	10
1.3.3	Fuselage	11
1.4	Aircraft Materials	12
	Problems	17
2	Introduction to Elasticity	19
2.1	Concept of Displacement	19
2.2	Strain	21
2.3	Stress	25
2.4	Equations of Equilibrium in a Nonuniform Stress Field	28
2.5	Principal Stress	31
2.6	Shear Stress	34
2.7	Revisit of Transformation of Stress	36
2.8	Linear Stress-Strain Relations	38
2.8.1	Strains Induced by Normal Stress	39
2.8.2	Strains Induced by Shear Stress	42
2.8.3	Three-Dimensional Stress-Strain Relations	43
2.9	Elastic Strain Energy	47
2.10	Plane Elasticity	49
2.10.1	Stress-Strain Relations for Plane Isotropic Solids	50
2.10.2	Stress-Strain Relations for Orthotropic Solids in Plane Stress	53
2.10.3	Governing Equations	54
2.10.4	Solution by Airy Stress Function for Plane Isotropic Solids	56
	Problems	57
3	Torsion	63
3.1	Saint-Venant's Principle	63
3.2	Torsion of Uniform Bars	67
3.3	Bars with Circular Cross-Sections	74
3.4	Bars with Narrow Rectangular Cross-Sections	77
3.5	Closed Single-Cell Thin-Walled Sections	81
3.6	Multicell Thin-Walled Sections	91
3.7	Warping in Open Thin-Walled Sections	96
3.8	Warping in Closed Thin-Walled Sections	101
3.9	Effect of End Constraints	103
	Problems	110
4	Bending and Flexural Shear	115
4.1	Derivation of the Simple (Bernoulli-Euler) Beam Equation	115
4.2	Bidirectional Bending	120
4.3	Transverse Shear Stress due to Transverse Force in Symmetric Sections	128
4.3.1	Narrow Rectangular Cross-Section	128
4.3.2	General Symmetric Sections	130
4.3.3	Thin-Walled Sections	132
4.3.4	Shear Deformation in Thin-Walled Sections	133
4.4	Timoshenko Beam Theory	136
4.5	Shear Lag	140
	Problems	144
5	Flexural Shear Flow in Thin-Walled Sections	149
5.1	Flexural Shear Flow in Open Thin-Walled Sections	149
5.1.1	Symmetric Thin-Walled Sections	150
5.1.2	Unsymmetric Thin-Walled Sections	155
5.1.3	Multiple Shear Flow Junctions	157
5.1.4	Selection of Shear Flow Contour	158
5.2	Shear Center in Open Sections	159
5.3	Closed Thin-Walled Sections and Combined Flexural and Torsional Shear Flow	165
5.3.1	Shear Center	165
5.3.2	Statically Determinate Shear Flow	171
5.4	Closed Multicell Sections	173
	Problems	177
6	Failure Criteria for Isotropic Materials	183
6.1	Strength Criteria for Brittle Materials	183
6.1.1	Maximum Principal Stress Criterion	184
6.1.2	Coulomb-Mohr Criterion	184
6.2	Yield Criteria for Ductile Materials	186
6.2.1	Maximum Shear Stress Criterion (Tresca Yield Criterion) in Plane Stress	187
6.2.2	Maximum Distortion Energy Criterion (von Mises Yield Criterion)	188
6.3	Fracture Mechanics	193
6.3.1	Stress Concentration	193
6.3.2	Concept of Cracks and Strain Energy Release Rate	194
6.3.3	Fracture Criterion	196
6.4	Stress Intensity Factor	201
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 G	206
6.4.4	Mixed Mode Fracture	210
6.5	Effect of Crack Tip Plasticity	211
6.6	Fatigue Failure	214
6.6.1	Constant Stress Amplitude	215
6.6.2	S-N Curves	215
6.6.3	Variable Amplitude Loading	216
6.7	Fatigue Crack Growth	217
	Problems	219
7	Elastic Buckling	225
7.1	Eccentrically Loaded Beam-Column	225
7.2	Elastic Buckling of Straight Bars	227
7.2.1	Pinned-Pinned Bar	228
7.2.2	Clamped-Free Bar	231
7.2.3	Clamped-Pinned Bar	232
7.2.4	Clamped-Clamped Bar	234
7.2.5	Effective Length of Buckling	235
7.3	Initial Imperfection	236
7.4	Postbuckling Behavior	238
7.5	Bar of Unsymmetric Section	244
7.6	Torsional-Flexural Buckling of Thin-Walled Bars	246
7.6.1	Nonuniform Torsion	246
7.6.2	Torsional Buckling of Doubly Symmetric Section	248
7.6.3	Torsional-Flexural Buckling	251
7.7	Elastic Buckling of Flat Plates	256
7.7.1	Governing Equation for Flat Plates	256
7.7.2	Cylindrical Bending	258
7.7.3	Buckling of Rectangular Plates	259
7.7.4	Buckling under Shearing Stresses	263
7.8	Local Buckling of Open Sections	264
	Problems	266
8	Analysis of Composite Laminates	271
8.1	Plane Stress Equations for Composite Lamina	271
8.2	Off-Axis Loading	277
8.3	Notation for Stacking Sequence in Laminates	280
8.4	Symmetric Laminate under In-Plane Loading	282
8.5	Effective Moduli for Symmetric Laminates	285
8.6	Laminar Stresses	288
8.7	[plus or minus degree] Laminate	290
	Problems	292
	Index	295