Study on terminal effects of dense fragment cluster impact on armor plate. Part II: numerical simulations

In the paper of analytic modelling, i.e. Part I of this project, the phenomena and the test results of dense fragment cluster impacting armor plate are introduced. The analytical method is used to investigate the cumulative and additive effects. The extrusion-shear damage model of the target impacted by the fragment cluser is developed, and two criteria of the cumulative effect are proposed. This article describes numerical study of the problem in order to examine the analytical model and to study the target damage pattern. The numerical simulations of multi-fragment impact reproduce the experimental phenomena of fragment cluster penetrating into a target plate. It shows that the cumulative and additive damage phenomena can be identified by the fragment density and the fragment hit-time interval. Meanwhile, the fragment density is more sensitive than the hit-time interval to the target damage pattern.