Author(s)

L.I. Slepyan

Abstract

Structures under Shock and Impact 281 Impact and penetration: rigid and extensible structures L.I. Slepyan Department of Solid Mechanics, Materials and Structures, Faculty of Engineering, Tel Aviv University, P.O. Box 39040, Ramat Aviv, ABSTRACT High-speed penetration is considered as well as a collision under a moderate speed. The rigid rod penetration into a deformable plate is represented as a two-stage process. The first one is a rigid body movement in a half-space when the rear surface has no influence on the deformation and flow of the material. A simple hydro dynamic model is proposed for this stage, permit- ting an estimate of the resistance to movement and the size of the crater created by the moving body. It is shown that the resistance to movement reaches a minimum at a certain speed differing from zero, its value depends on the properties of the medium and the shape of the leading tip of the rod. The second stage comes when the crac

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