基于FEM/SPH算法的弹丸侵彻土体数值模拟

摘要

基于有限元法（FEM）和光滑粒子流体动力学（SPH）结合的算法，用数值模拟了钢质弹丸对钢筒约束土体的侵彻过程。基于ANSYS/LS-DYNA显式动力分析和LS-PrePost后处理软件，形象再现了钢质弹丸冲击作用下土体飞溅形成漏斗坑和直线通道的物理过程。侵彻深度计算结果与实验数据吻合较好，钢质弹丸的速度和加速度时程曲线图与理论分析一致，体现了FEM/SPH算法的精确性。研究结果表明FEM/SPH算法在模拟侵彻土体方面具有可行性和有效性。%Based on the combination of the finite element method(FEM)and the smooth particle hydrodynamics(SPH), nu-merical simulation of steel projectile penetration into soil constrained by steel cylinder is carried out. Based on the ANSYS/LS-DYNA explicit dynamic analysis software and the LS-PrePost post-processing software, the process of projectile impact splash, forming a funnel pit and linear channel is recreated visually. Penetration depth calculation results are consistent with experiment results and velocity-time history and acceleration-time history curve is in good agreement with theory, indicating the accuracy of the FEM/SPH algorithm. The results prove the validity and feasibility of the FEM/SPH algorithm in simulating penetration into soil.