Yaw 를 가진 긴 관통자와 경사판재의 고속충돌 수치해석

Abstract

Using the Lagrangian explicit time-integration finite element code NET3D which can treat three­dimensional high-velocity impact problems, oblique penetration processes of long rod projectile with yaw against thin plate are simulated. Through the comparison of simulation result with experimental result and other code's computational result. the adaptability and accuracy of NET3D is evaluated under the complex situation in which yaw angle and oblique angle exist simultaneously. Main research contents to be handled in this paper include the followings. First. the accuracy and efficiency estimation of NET 3D code result obtained from the oblique penetration simulations of long rod projectile with yaw against thin plate. Second, the cffect of increasing impact velocity. Third, the effect of initial yaw for the spaced-plate target. Residual velocities, residual lengths, angular velocities, and final deformed configurations obtained from the NET3D computations are compared with the experimental results and other code's computational results such as Eulerian code MESA and Lagrangian code EPIC. As a result of comparisons, it has been found that NET3D code is superior to EPIC code and MESA code in the prediction capability of residual velocity and residual length of penetrator. The key features obtained from the experiment can be successfully reproduced through NET3D simulations. Throughout the study. the applicability and accuracy of NET3D as a metallic armor system design tool is verified.