Numerical Analysis of Penetration Reduction of a Long Rod Penetrator Impacted by a Linear Explosively Formed Penetrator

Abstract

In this study, the collision effect against a long rod penetrator by a linear explosively formed penetrator (LEFP) was investigated through a series of numerical analyses. LS-DYNA, a nonlinear finite element analysis code, and the multi-material ALE technique were used to conduct the analysis containing a collision into a long rod penetrator with L/D=10.7 and an initial velocity of 1,600 m/s by an LEFP and subsequent residual penetration into RHA steel by the long rod penetrator. Some combinations of hit locations and hit angles by the LEFP against the long rod penetrator were composed to formulate possible collision conditions. Under such conditions, DOP reductions by the rod penetrator damaged by the LEFP were predicted as considerable, and the reasons why such DOP reductions were achieved were discussed on the basis of the behavior of the deformed rod penetrator after impact by an LEFP.