关于弹体冲击和贯穿混凝土的三维数值模拟

利用FEM和SPH算法相结合给出弹体冲击和贯穿混凝土的三维数值模拟。将弹体划分为四面体有限元网格，混凝土划分为光滑粒子。为形成单元方便，将弹体划分成三个独立的模块并且这三个独立的模块具有拼凑功能。给出光滑粒子-有限元界面的滑移面算法。为了提高计算效率，在程序的前处理中预设界面的从属点和每个光滑粒子的关联点。计算结果与实验结果对比表明，FEM和SPH算法相结合及编制的程序能有效模拟弹体对混凝土的三维冲击和贯穿过程。同时给出在垂直冲击中二维计算与三维计算的差别。

3D-numerical simulations on impact and perforation of concrete targets by projectiles

Three-dimensional(3D) numerical simulations of impact and perforation of concrete targets by projectiles have been performed by incorporating FEM with SPH algorithm.The projectile is divided into quadrilateral elements,and the concrete target is divided into smooth particles.In order to form the elements conveniently,the projectile element consists of three characteristic parts with assembly functions.The sliding surface algorithm for interfaces of SP-FE(smooth particles-finite elements) has been formulated,and to raise the computational efficiency,the slave particles and their connected particles are defined in the pre-processing subroutine.The calculated examples have shown that the combination algorithm of FEM with SPH and the related code could be used to simulate the impact and perforation of concrete targets by projectiles.The differences between 3D and 2D computations for vertical impact as well as the comparison with experimental data are presented here.