A numerical exploration of the role of void geometry on void collapse and hot spot formation in ductile materials

An Eulerian hydrocode was used to simulate the dynamic void collapse in OFH C copper, modeled with the Johnson-Cook (Johnson, G.R., Cook, W.H., 1985. E ngineering Fracture Mechanics 21(1), 31) material model and the Cruneisen e quation of state, to study hot spot formation and jetting. The computationa l techniques were first validated by a comparison to a series of two-dimens ional experiments. The effect of the planar and axisymmetric geometries on the hot spot temperature and jet velocity in circular voids is explored. In addition, the effect of the apex angle in triangular voids on jetting and hot spot formation is studied. An effective apex angle for the highly nonsp herical voids formed in closely packed circular particles is calculated. (C ) 2000 Published by Elsevier Science Ltd. All rights reserved.