analysis of propagation of displacement wave in laminated plates subjected to impact

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. a rigid metallic projectile with spherical nose is considered and the impact of this projectile with laminated composite is studied in this study. considering a finite element model the governing equations of the problem is 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 nikolson numerical integration method. the contact force is modeled using the modified hertz contact law. probable loading and unloading could be considered during the impact. the predictions of the finite element model are compared with the other results which are available in the literature and good agreement is seen. the propagation of the waves in the plate with different sets of edge boundary conditions are studied in the numerical results. various results for the propagation of the wave in the time domain is presented and the reflection of the waves from the boundaries, 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 is highly dependent on the boundary conditions of the plate and the layer stacking of the composite plate.