Author(s)

T. Umeda, S. Murakami & M. Itolf

Abstract

A systematic method to predict spall damage of plate impact based on continuum damage mechanics(CDM) was proposed. By representing the damage state by use of a scalar damage variable, the viscoplastic constitutive equation of Perzyna^ together with the damage evolution equation of Lemaitre & Chaboche^ were incorporated into the commercial finite-difference program MANJUSRI- 3D for non-linear dynamic analysis. The effect of the surface energy due to the nucleation and growth of microvoids was included into the energy conservation law. The numerical results, such as particle velocity-time profiles at the center of the target rear surface and damage distribution, were compared with the corresponding results of the experiments. The differences between one- dimensional and two-dimensional analysis were dis

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