Analytical Approach for Elucidation of Unique Deformation and Fracture Phenomena of Porous Metal under High-Speed Impact

Abstract

When a small, high-speed object at a rate of several kilometers per second collides against porous metal, it is known from previous studies that a unique, turnip-shaped crater with a narrow entrance and a large cavity is formed. The approach of numerical simulation is indispensable in elucidating the unique fracture phenomenon; however, this unique fracture will not occur unless the actual porous structure is replicated. Therefore, it is necessary to create a 3D FEM model of the porous structure. In this research, programming methods called Poisson disk sampling and Voronoi tessellation were used to create the 3D porous model. The characteristics of these models were compared and discussed.