DYNAMIC DUCTILE FRAGMENTATION AND THE DAMAGE FUNCTION MODEL

A new damage function suitable for metals under dynamic loading, based on the physical statistics of microvoids in metals and the law of con servation of energy, is presented in this article. This new damage mod el has a sound physical or theoretical foundation and fewer adjustable or empirical parameters than most existing models. Several hydrodynam ic elastic-plastic numerical modeling experiments that use this damage function combined with the proper constitutional equations have been conducted by us and the results are in good agreement with previously published experimental results on different metals with different geom etries. (C) 1997 American Institute of Physics.