Dynamic Response in an Elastic-Plastic Projectile Due to Normal Impact

摘要

A numerical study of the dynamic response of an elastic-plastic projectile due to normal impact has been made using the finite element structural response code ADINA. The projectile is a finite length circular cylindrical bar striking a rigid target. First, three (central-difference, Newmark, Wilson) direct integration schemes have been used for the uniaxial stress wave problem in a linear-hardening material, and the results are compared with an exact analytical solution in order to evaluate accuracy and stability. Then, additional numerical results for perfectly-plastic materials are discussed in order to show the effect of strain-hardening. Finally, some results for a multi-linear material model based on two-dimensional elements are presented in order to show the lateral effect.