A numerical simulation of the blast impact of square metallic sandwich panels

This paper presents details and brief results of an experimental investigation on the response of square metallic sandwich panels with a cellular core under blast loading. Based on the experiments, corresponding finite element simulations have been undertaken using the LS-DYNA software. Detailed description of the models and simulation results is presented. In the simulation work, the loading process of explosive and response of the sandwich panels have been investigated. The blast loading process includes both the explosion procedure of the charge and the interaction with the panel. The structural responses of sandwich panels are studied in terms of two aspects: (1) deformation/failure patterns of the specimens; and (2) quantitative assessment, which mainly focuses on the permanent centre point deflection of the back face of the panels. In addition, a parametric study has been carried out to examine the contribution of plastic stretching and bending on the deformation history of the sandwich panels, as well as the effect of boundary conditions. A good agreement has been obtained between the numerical and experimental results, and thus the proposed FE model can be considered as a valuable tool in assessing and understanding the deformation/failure mechanism and predicting the dynamic response of square metallic sandwich structures subjected to blast loading.