Analysis of Displacement Wave Propagation in Laminated Plates Subjected to Impact Force

In this paper¡ the propagation of the waves in the laminated composite plates which is subjected to low velocity impact is investigated using the finite element method. Considering a finite element model the governing equations of the problem are discretized and the mass¡ stiffness and force matrix are obtained. The governing equations of the plate and the projectile are solved in the time domain using the Newmark and Nicolson numerical integration method. The contact force is modeled using the modified Hertz contact law. The propagation of the waves in the plate with different sets of edge boundary conditions are studied in the numerical results. The node dependency of the results is investigated and the effects of boundary conditions of the plate on the maximum impact load are studied. Various results for the propagation of the wave in the time domain are presented and the time history of the contact force¡ impact time duration and second impacts are studies in the numerical results. The analysis of results indicates that the wave propagation depends on the boundary conditions of the plate and the layer stacking of the composite plate.