| HISTORICAL INTRODUCTION |
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Scope of History. |
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Galileo's enquiry. |
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Enunciation of Hooke's Law. |
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Mariotte's investigations. |
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The problem of the elastica. |
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Euler's theory of the stability of struts. |
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Researches of Coulomb and Young. |
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Euler's theory of the vibrations of bars. |
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Attempted theory of the vibrations of bells and plates. |
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Value of the researches made before 1820. |
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Navier's investigation of the general equations. |
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Impulse given to the theory by Fresnel. |
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Cauchy's first memoir. |
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"Cauchy and Poisson's investigations of the general equations by means of the "molecular" hypothesis." |
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Green's introduction of the strain-energy-function. |
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Kelvin's application of the laws of Thermodynamics. |
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Stoke's criticism of Poisson's theory. |
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"The controversy concerning the number of the "elastic constants." |
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Methods of solution of the general problem of equilibrium. |
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Vibrations of solid bodies. |
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Propagation of waves. |
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Technical problems. |
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Saint-Venant's theories of torsion and flexure. |
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Equipollent loads. |
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Simplifications and extensions of Saint-Venant's theories. |
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Jouravski's treatment of shearing stress in beams. |
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Continuous beams. |
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Kirchhoff's theory of springs. |
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Criticisms and applications of Kirchhoff's theory. |
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Vibrations of bars. |
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Impact. |
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Dynamical resistance. |
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The problem of plates. |
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The Kirchhoff-Gehring theory. |
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Clebsch's modification of this theory. |
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Later researches in the theory of plates. |
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The problem of shells. |
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Elastic stability. |
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Conclusion. |
| CHAPTER I. ANALYSIS OF STRAIN |
| 1 Extension |
| 2 Pure shear |
| 3 Simple shear |
| 4 Displacement |
| 5 Displacement in simple extension and simple shear |
| 6 Homogeneous strain |
| 7 Relative displacement |
| 8 Analysis of the relative displacement |
| 9 Strain corresponding with small displac |
| 10 Components of strain |
| 11 The strain quadratic |
| 12 Transformation of the components of strain |
| 13 Additional methods and results |
| 14 Types of strain. |
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(a) Uniform dilatation |
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(b) Simple extension |
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(c) Shearing strain |
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(d) Plane strain |
| 15 "Relations connecting the dilatation, the rotation and the displacement" |
| 16 Resolution of any strain into dilatation and shearing strains |
| 17 Identical relations between components of strain |
| 18 Displacement corresponding with given strain |
| 19 Curvilinear orthogonal coordinates |
| 20 Components of strain referred to curvilinear orthogonal coordinates |
| 21 Dilatation and rotation referred to curvilinear orthogonal coordinates |
| 22 Cylindrical and polar coordinates |
| 22C Further theory of curvilinear orthogonal coordinates |
| APPENDIX TO CHAPTER I. GENERAL THEORY OF STRAIN |
| 23 Introductory |
| 24 Strain corresponding with any displacement |
| 25 Cubical dilatation |
| 26 Reciprocal strain ellipsoid |
| 27 Angle between two curves altered by strain |
| 28 Strain ellipsoid |
| 29 Alteration of direction by the strain |
| 30 Application to cartography |
| 31 Conditions satisfied by the displacement |
| 32 Finite homogeneous strain |
| 33 Homogeneous pure strain |
| 34 Analysis of any homogeneous strain into a pure strain and rotation |
| 35 Rotation |
| 36 Simple extension |
| 37 Simple shear |
| 38 Additional results relating to shear |
| 39 Composition of strains |
| 40 Additional results relating to the composition of strains |
| CHAPTER II. ANALYSIS OF STRESS |
| 41 Introductory |
| 42 Traction across a plane at a point |
| 43 Surface tractions and body forces |
| 44 Equations of motion |
| 45 Equilibrium |
| 46 Law of equilibrium of surface tractions on small volumes |
| 47 Specification of stress at a point |
| 48 Measure of stress |
| 49 Transformation of stress-components |
| 50 The stress quadratic |
| 51 Types of stress. |
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(a) Purely normal stress |
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(b) Simple tension or pressure |
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(c) Shearing stress |
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(d) Plane stress |
| 52 Resolution of any stress-system into uniform tension and shearing stress |
| 53 Additional results |
| 54 The stress-equations of motion and of equilibrium |
| 55 Uniform stress and uniformly varying stress |
| 56 Observations concerning the stress-equations |
| 57 Graphic representation of stress |
| 58 Stress-equations referred to curvilinear orthogonal coordi |
| 59 Special cases of stress-equations referred to curvilinear orthogonal coordinates |
| CHAPTER III. THE ELASTICITY OF SOLID BODIES |
| 60 Introductory |
| 61 Work and energy |
| 62 Existence of the strain-energy-function |
| 63 Indirectness of experimental results |
| 64 Hooke's Law |
| 65 Form of the strain-energy-function |
| 66 Elastic constants |
| 67 Methods of determining the stress in a body |
| 68 Form of the strain-energy-function for isotropic solids |
| 69 Elastic constants and moduluses of isotropic solids |
| 70 Observations concerning the stress-strain relations in isotropic solids |
| 71 Magnitude of elastic constants and moduluses of some isotropic solids |
| 72 Elastic constants in general |
| 73 Moduluses of elasticity |
| 74 Thermo-elastic equations |
| 75 Initial stress |
| CHAPTER IV. THE RELATION BETWEEN THE MATHEMATICAL THEORY OF ELASTICITY AND TECHNICAL MECHANICS |
| 76 Limitations of the mathematical theory |
| 77 Stress-strain diagrams |
| 78 Elastic limits |
| 79 Time-effects. Plasticity |
| 79A Momentary stress |
| 80 Viscosity of solids |
| 81 Æolotropy induced by permanent set |
| 82 Repeated loading |
| 82A Elastic hysteresis |
| 83 Hypotheses concerning the conditions of rupture |
| 84 Scope of the mathematical theory of elasticity |
| CHAPTER V. THE EQUILIBRIUM OF ISOTROPIC ELASTIC SOLIDS |
| 85 Recapitulation of the general theory |
| 86 Uniformly varying stress. |
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(a) Bar stretched by its own weight |
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(b) Cylinder immersed in fluid |
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(c) Body of any form immersed in fluid of same density |
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(d) Round bar twisted by couples |
| 87 Bar bent by couples |
| 88 Discussion of the solution for the bending of a bar by terminal couple |
| 89 Saint-Venant's principle |
| 90 Rectangular plate bent by couples |
| 91 Equations of equilibrium in terms of displacements |
| 92 Relations between components of stress |
| 93 Additional results |
| 94 Plane strain and plane stress |
| 95 Bending of narrow rectangular beam by terminal load |
| 96 Equations referred to orthogonal curvilinear coordinates |
| 97 Polar coordinates |
| 98 Radial displacement. Spherical Shell under internal and external pressure. Compression of a sphere by its own gravitation |
| 99 Displacement symmetrical about an axis |
| 100 Tube under pressure |
| 101 Application to gun construction |
| 102 Rotating cylinder. Rotating shaft. Rotating disk |
| CHAPTER VI. EQUILIBRIUM OF ÆOLOTROPIC ELASTIC SOLID BODIES |
| 103 Symmetry of structure |
| 104 Geometrical symmetry |
| 105 Elastic symmetry |
| 106 Isotropic |
| 107 Symmetry of crystals |
| 108 Classification of crystals |
| 109 Elasticity of crystals |
| 110 Various types of symmetry |
| 111 Material with three orthogonal planes of symmetry. Moduluses |
| 112 Extension and bending of a bar |
| 113 Elastic constants of crystals. Results of experiments |
| 114 Curvilinear æolotropy |
| CHAPTER VII. GENERAL THEOREMS |
| 115 The variational equation of motion |
| 116 Applications of the variational equation |
| 117 The general problem of equilibrium |
| 118 Uniqueness of solution |
| 119 Theorem minimum energy |
| 120 Theorem of concerning the potential energy of deformation |
| 121 The reciprocal theorem |
| 122 Determination of average strains |
| 123 Average strains in an isotropic solid body |
| 124 The general problem of vibrations. Uniqueness of solution |
| 125 Flux of energy in vibratory motion |
| 126 Free vibrations of elastic solid bodies |
| 127 General theorems relating to free vibrations |
| 128 Load suddenly applied or suddenly reversed |
| CHAPTER VIII. THE TRANSMISSION OF FORCE |
| 129 Introductory |
| 130 Force operative at a point |
| 131 First type of simple solutions |
| 132 Typical nuclei of strain |
| 133 Local perturbations |
| 134 Second type of simple solutions |
| 135 Pressure at a point on a plane boundary |
| 136 Distributed pressure |
| 137 Pressure between two bodies in contact. Geometrical preliminaries |
| 138 Solution of the problem of the pressure between two bodies in contact |
| 139 Hertz's theory of impact |
| 140 Impact of spheres |
| 141 Effects of nuclei of strain referred to polar coordinates |
| 142 Problems relating to the equilibrium of cones |
| CHAPTER IX. TWO-DIMENSIONAL ELASTIC SYSTEMS |
| 143 Introductory |
| 144 Displacement corresponding with plane strain |
| 145 Displacement corresponding with plane stress |
| 146 Generalized plane stress |
| 147 Introduction of nuclei of strain |
| 148 Force operative at a point |
| 149 Force operative at a point of a boundary |
| 150 Case of a straight boundary |
| 151 Additional results: |
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(i) the stress function |
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(ii) normal tension on a segment of a straight edge |
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(iii) force at an angle |
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(iv) pressure on faces of wedge |
| 152 Typical nuclei of strain in two dimensions |
| 153 Transformation of plane strain |
| 154 Inversion |
| 155 Equilibrium of a circular disk under forces in its plane. |
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(i) Two opposed forces at points on the rim |
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(ii) Any forces applied to the rim |
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(iii) Heavy disk resting on horizontal |
| 156 Examples of transformation |
| APPENDIX TO CHAPTERS VIII AND IX. VOLTERRA'S THEORY OF DISLOCATIONS |
| 156A Introductory. |
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(a) Displacement answering to given strain |
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(b) Discontinuity at a barrier |
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(c) Hollow cylinder deformed by removal of a slice of uniform thickness |
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(d) Hollow cylinder with radial fissure |
| CHAPTER X. THEORY OF THE INTEGRATION OF THE EQUATIONS OF EQUILIBRIUM OF AN ISOTROPIC ELASTIC SOLID BODY |
| 157 Nature of the problem |
| 158 Résumé of the theory of Potential |
| 159 Description of Betti's method of integration |
| 160 Formula for the dilatation |
| 161 Calculation of the dilatation from surface data |
| 162 Formulæ for the components of rotation |
| 163 Calculation of the rotation from surface data |
| 164 Body bounded by plane?Formulæ for the dilatation |
| 165 Body bounded by plane?Given surface displacements |
| 166 Body bounded by plane?Given surface tractions |
| 167 Historical Note |
| 168 Body bounded by plane?Additional results |
| 169 Formulæ for the displacement and strain |
| 170 Outlines of various methods of integration |
| CHAPTER XI. THE EQUILIBRIUM OF AN ELASTIC SPHERE AND RELATED PROBLEMS |
| 171 Introductory |
| 172 Special solutions in terms of spherical harmonics |
| 173 Applications of the special solutions: |
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(i) Solid sphere with purely radial surface displacement |
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(ii) Solid sphere with purely radial surface traction |
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(iii) Small spherical cavity in large solid mass |
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(iv) Twisted sphere |
| 174 Sphere subjected to body force |
| 175 Generalization and Special Cases of the foregoing solution |
| 176 Gravitating incompressible sphere |
| 177 Deformation of gravitating incompressible sphere by external body force |
| 178 Gravitating body of nearly spherical form |
| 179 Rotating sphere under its own attraction |
| 180 Tidal deformation. Tidal effective rigidity of the Earth |
| 181 A general solution of the equations of equilibrium |
| 182 Applications and extension of the foregoing solution |
| 183 The sphere with given surface displacements |
| 184 Generalization of the foregoing solution |
| 185 The sphere with give surface tractions |
| 186 Plane strain in a circular cylinder |
| 187 Applications of curvilinear coordinates |
| 188 Symmetrical strain in a solid of revolution |
| 189 Symmetrical strain in a cylinder |
| CHAPTER XII. VIBRATIONS OF SPHERES AND CYLINDERS |
| 190 Introductory |
| 191 Solution by means of spherical harmonics |
| 192 Formation of the boundary-conditions for a vibrating sphere |
| 193 Incompressible material |
| 194 Frequency equations for vibrating s |
| 195 Vibrations of the first class |
| 196 Vibrations of the second class |
| 197 Further investigations on the vibrations of spheres |
| 198 Radial vibrations of a hollow sphere |
| 199 Vibrations of a circular cylinder |
| 200 Torsional vibrations |
| 201 Longitudinal vibrations |
| 202 Transverse vibrations |
| CHAPTER XIII. THE PROPAGATION OF WAVES IN ELASTIC SOLID MEDIA |
| 203 Introductory |
| 204 Waves of dilatation and waves of distortion |
| 205 Motion of a surface of discontinuity. Kinematical conditions |
| 206 Motion of a surface of discontinuity. Dynamical conditions |
| 207 Velocity of waves in isotropic medium |
| 208 Velocity of waves in æolotropic medium |
| 209 Wave-surfaces |
| 210 Motion determined by the characteristic equation |
| 211 Arbitrary initial conditions |
| 212 Motion due to body forces |
| 213 Additional results relating to motion due to body forces |
| 214 Waves propagated over the surface of an isotropic elastic solid body |
| CHAPTER XIV. TORSION |
| 215 Stress and strain in a twisted prism |
| 216 The torsion problem |
| 217 Method of solution of the torsion problem |
| 218 Analogies with Hydrodynamics |
| 219 Distribution of the shearing stress |
| 220 Strength to resist torsion |
| 221 Solution of the torsion problem for certain boundaries |
| 222 Additional results |
| 223 Graphic expression of the results |
| 224 Analogy to the form of a stretched membrane loaded uniformly |
| 225 Twisting couple |
| 226 Torsion of æolotropic prism |
| 226A Bar of varying circular section |
| 226B Distribution of traction over terminal section |
| CHAPTER XV. THE BENDING OF A BEAM BY TERMINAL TRANSVERSE LOAD |
| 227 Stress in bent beam |
| 228 Statement of the problem |
| 229 Necessary type of shearing stress |
| 230 Formulæ for the displacement |
| 231 Solution of the problem of flexure for certain boundaries: |
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(a) The circle |
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(b) Concentric circles |
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(c) The ellipse |
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(d) Confocal ellipses |
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(e) The rectangle |
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(f) Additional results |
| 232 Analysis of the displacement: |
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(a) Curvature of the strained central-line |
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(b) Neutral plane |
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(c) Obliquity of the strained cross-sections |
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(d) Deflexion |
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(e) Twist |
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(f) Antilclastic curvature |
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(g) Distortion of the cross-sections into curved surfaces |
| 233 Distribution of shearing stress |
| 234 Generalizations of the foregoing the |
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(a) Asymmetric loading |
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(b) Combined strain |
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(c) Æolotropic material |
| 234C Analogy to the form of a stretched membrane under varying pressure |
| 235 Criticisate or shell |
| 325 Method of calculating the extension and the changes of curvature |
| 326 Formulæ relating to small displacements |
| 327 Nature of the strain in |