Perforation of rigid-plastic plate by blunt missile

Three rigid plastic models are presented to treat circular plate deformation during perforation by a rigid missile; these models are based on different assumptions for yield. The analysis considers plate bending, stretching and also shear around the periphery of a central plug. An equivalent strain failure criterion is developed that includes the influence of both shear and radial tensile strain on localized failure of the plate. Both this and a pure shear failure criterion of Shadbolt et al. [1] are used together with three structural deformation models to calculate the ballistic limit and final deformed profiles of plates. These calculations are compared with some experimental results for plates of different materials.