Page 604 - Aircraft Stuctures for Engineering Student

index 585

Finite-element method, see Matrix methods Gust loads, see Airworthiness
Flexibility coefficient 103
Flexural axis 444 Hiduminium RR58 215,216
Flexural rigidity Homogeneous materials 24
of a beam 82 Hooke’s law 24
of a plate 124
Flexural-torsional buckling of thin-walled Inelastic buckling of columns, see Columns
columns 180-8 Inelastic buckling of plates 173
Flight envelope, see Airworthiness plasticity correction factor 173
Flutter 540, 568-76 secant modulus 173
aileron buzz 570 tangent modulus 173
buffeting 570 Inertia loads aircraft 238-43
classical flutter 570 Influence coefficient, see Flexibility
control surface flutter 575, 576 coefficient
ground resonance test 576 Instability of stiffened panels 175-7
mass balancing 576 Integral construction 230
coupling 570-2 Interrivet buckling in stiffened panels 177
aerodynamic 571 Inverse method for elasticity problems
centre of independence 571 39-42
elastic 571, 572 Isotropic materials 24
inertial 570
determination of critical flutter speed Kevlar 218
572-4 Kirchhoff, G.R. 133
experimental determination of flutter
speed 575 Laminated composite structures, see Stress
prevention 574-5 analysis of aircraft components
stalling flutter 570 Laplacian operator 53, 131
wing bending-torsion flutter 569 Law of mixtures 426
Force 4 Limit load, see Airworthiness
body forces 7 Load factors, see Airworthiness
internal at a point 4 Load intensity, shear force and bending
internal components 4 moment relationships 283, 284
notation 5-7 Loads on structural components 220-3
surface forces 7 aerodynamic forces 221-3
Fourier series for plate deflection 135 aerodynamic centre 221
Function of structural components 223-5 centre of pressure 221
fuselage components 225 drag 221
nionocoque structures 223 lift 221, 222
semi-monocoque structures 223 pitching moment 221
tail unit 225 yawing moment 221
wing components 223-5 air loads 220
Fuselage components 225 body forces 220
Fuselages, analysis, see Stress analysis of ground loads 220
aircraft components surface forces 220
Fuselage frames and wing ribs, see Stress see also Airworthiness; Fatigue
analysis of aircraft components Local instability of thin-walled columns
174, 175
Glass, see Materials of aircraft construction Lumped mass concept 552
Glass reinforced plastic 218, 219
Goodman diagram 261 Maraging steels 216
Ground resonance tests, see Flutter Mass balancing, see Flutter