Page 603 - Aircraft Stuctures for Engineering Student

584 Index

Composite materials cont. strain energy 68, 69, 142, 143
Kevlar 218 total complementary energy 68, 76-100,
lay-up 218,432 108
Contour lines 62, 63 total potential energy 68,71,73-6, 144-9,
Corresponding displacements 71, 103 165-9
Crack propagation, see Fatigue unit load method 68, 85, 100-2, 342-4,
Curved web with constant shear flow 336-8 404,405
Cut-outs in wings and fuselages, see Stress Equilibrium equations 7-9, 37
analysis of aircraft components Euler buckling of columns 152-6
Experimental determination of buckling
Deflections of beams due to bending 284-7 load of a flat plate 174
Deflection of open and closed section beams Experimental measurement of surface strains
due to bending, shear and torsion 342-4 28-32
multicell wings 404,405
unit load method 342-4 Fabrication of structural components
Deflection of thin plates 122-49 225-32
Diagonal tension, see Tension field beams fuselages 232
Displacements in two-dimensional problems integral construction 230
on elasticity 43 sandwich panels 230,23 1
Divergence, see Aeroelasticity sub-assembly 228, 229
Duralumin 213, 215 Wings 228-30
Factors of safety - flight envelope 233-5
Effect of structural idealization on analysis, Fail-safe structures, see Fatigue
see Structural idealization Failure stress in plates and stiffened panels
Effective length of a column, see Columns 177-80
Eigenloads, see Structural constraint Fatigue 236-8,257-71
Eigenvalues, functions, see Columns acoustic fatigue 257
Elastic constants for composite plates crack propagation 267-71
425-32 basic modes of crack growth 268
Elasticity fracture toughness 271
basic 3-35 stress field 269
two-dimensional problems 36-48 stress intensity factor 269
Energy methods 68-109 cyclic fatigue 257
Castigliano’s first theorem 70 designing against fatigue 258-60
complementary energy 69, 70, 76-100, fatigue load spectrum 258
108 fatigue strength of components 260-3
fictitious or dummy load method 79-85 confidence limits 260
for buckling of columns 165-9 cumulative probability 260
for bending of thin plates 142-9 extreme value distribution 261
potential energy 70, 71, 73-6, 144-9, Goodman diagram 261
165-9 Miner and Palmgren linear cumulative
principle of stationary value of total damage law 261,262
complementary energy 68-70, 76-100, scatter factor 263
108, 109 S-N curve 236,237
principle of stationary value of total gust exceedance 259,264
potential energy 73-6, 142-9, 165-9 gust frequency curves 259
principle of superposition 69, 103 prediction of aircraft fatigue life 263-7
principle of virtual displacements 71 -3 safe life and fail-safe structures 257, 258
principle of virtual forces 71-3 stress concentrations 258
principle of virtual work 71-3 thermal fatigue 257
reciprocal theorem 68, 103-7 Fictitious or dummy load method 79-85