Study of the Dynamic Response of Strain-Hardening Target in High-Velocity Impact

A dynamic cylindrical cavity expansion penetration model for compressible, elastic-plastic, rate-independent materials with power-law strain-hardening was presented. A fortran code using this model was written. We used the code to calculate the stress distribution in the target. We also used the code to predict residal velocities and ballistic limits for rigid, conical-nose projectile perforating strain-hardening target plates, and to predict the penetration depth for the same projectile penetrating into strain-hardening targets with semi-infinite thickness. We compared the model predictions of residal velocities and ballistic limits with the data from experiments with 0.026 kg tungsten projectiles impacting normally 5083-H131 aluminum armor plates. We also compared the predicted penetration depths with the experimental data or the 2-D numerically simulated results by LTZ-2D code for the 0.024 kg and the 2.96 kg maraging steel projectiles impacting normally semi-infinite 6061-T651 aluminum armor targets. Good agreements were obtained in both comparisons.