Accession Number : ADA194144

Title :   Wave Propagation and Vibration of Fibre Reinforced Laminates.

Descriptive Note : Final rept. 31 Aug 86-31 Aug 87,

Corporate Author : NOTTINGHAM UNIV (ENGLAND) DEPT OF THEORETICAL MECHANICS

Personal Author(s) : Green, W A ; Baylis, E R

PDF Url : ADA194144

Report Date : 31 Aug 1987

Pagination or Media Count : 64

Abstract : This paper deals with wave propagation in a symmetric cross-ply laminated plate due to an impulsive normal line load acting on the upper surface of the plate. The fibre-reinforced composite forming each of the four layers is modelled as a transversely isotropic homogenous elastic continuum which is inextensible in the fibre direction. Transform methods are employed to obtain solutions of the equations of motion in each layer in terms of propagator matrices. These general solutions are combined through the interface conditions to yield expressions for the displacement and stress transforms corresponding to the impact problem. Inversion of these transforms involves numerical integration along each branch of the plate dispersion equation and summation over a total of 18 branches. Graphical results are presented which show the variation of displacement and stresses at the upper and lower surfaces of the plate as functions of position at various times after impact. Keywords: Stress wave propagation, Impact, Fibre composites, Laminates, Transverse isotropy.

Descriptors :   *FIBER REINFORCED COMPOSITES, *LAMINATES, DISPLACEMENT, EQUATIONS OF MOTION, FIBER REINFORCEMENT, FIBERS, GRAPHICS, IMPACT, IMPULSE LOADING, INTERFACES, LAYERS, NUMERICAL INTEGRATION, PLATES, SOLUTIONS(GENERAL), STRESS WAVES, STRESSES, SURFACES, SYMMETRY, VARIATIONS, VIBRATION, WAVE PROPAGATION, DISPERSING, TRANSFORMATIONS(MATHEMATICS), MATHEMATICAL MODELS, GREAT BRITAIN

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE