DTIC ADA252101: Wave Propagation and Vibration of pdf

DTIC ADA252101: Wave Propagation and Vibration of

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Theoretical predictions are presented of the response of fibre-composite laminated plates to an impulse load. The cases considered were symmetric arrangements of four, six and eight plies of laminate consisting of straight parallel elastic fibres embedded in an isotropic elastic matrix. Analytical solutions allow the determination of the displacements and stress variation throughout the laminate at any time. The graphs presented show the variation of stresses and displacements along the plate surfaces and at the ply interfaces at fixed times. The analytical solutions illustrate the variation in the nature of the transmission with the direction of propagation and with ply lay-up. Surface impacts will initiate Rayleigh type surface waves propagating with a specified range of angles on any laminate. Outside this range of angles, the existence of the surface wave depends on the overall laminate depth. The study of these wave effects has thrown light on the way in which stress waves are channelled in the various layers of the laminate and on the manner in which this channelling is dependent on the angle between the fibre direction and the propagation direction in each layer

• Creator/s: Defense Technical Information Center
• Date: 2/1/1992
• Year: 1992
• Book Topics/Themes: DTIC Archive, Green, W A, NOTTINGHAM UNIV (UNITED KINGDOM) DEPT OF THEORETICAL MECHANICS, *VIBRATION, *LAMINATES, *FIBER REINFORCED COMPOSITES, *IMPULSE LOADING, *WAVE PROPAGATION, STRESSES, ANGLES, SURFACE WAVES, PREDICTIONS, LAYERS, LIGHT, DETERMINATION, ACOUSTIC EMISSIONS, ACOUSTICS, RESPONSE, PLATES, SURFACES, VARIATIONS, TIME, DEPTH, RAYLEIGH WAVES, STRESS WAVES, GRAPHS, DISPLACEMENT, MATERIALS, INTERFACES, IMPACT, EMISSION, PROPAGATION

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