Three-dimensional Elastic-Plastic Deformation Analysis of Composite Sandwich Panel under blast loading

In this paper, the elastic-plastic deformation response of cylindrical sandwich panels using ship hulls under the action of external blast loading has been obtained. It is assumed that the sandwich panel has simply supported boundary at all edges and consist of elastic orthotropic face sheets and a foam core layer with elastic-perfectly plastic behavior. Three-dimensional equations of motions based on the non-linear high-order theory have been used to describe the sandwich panel core deformations. The effects of various parameters including the panel span, core and facing thickness, pulse duration and maximum pressure on the plastic deformation of the core and sandwich panel facesheet fracture are studied. The results obtained from the present method are compared with finite element solutions using commercial software ANSYS and a good agreement among the results could be observed. It concluded that there is different blast resistant for sandwich panels with core pure elastic and elastic-plastic behavior. Also, it can be seen that inner facesheet of sandwich panels carried larger stresses than outer ones and causes panel fracture that for various foams occur in different place.