爆炸压实过程中颗粒碰撞问题的SPH法数值模拟

Numerical Simulation of Particles Impact in Explosive-Driven Compaction Process Using SPH Method

目前采用SPH无网格方法对大变形问题进行数值模拟已成为计算机仿真技术的研究热点。利用LS-DYNA程序中的SPH法对粉末爆炸压实过程中颗粒的碰撞问题进行了数值模拟。在二维及三维模型下,模拟出了微射流的产生及孔隙塌缩闭合过程,验证了粉末压实理论。另外还利用三项式状态方程及Rankine-Hugoniot关系推导得出了LS-DYNA中采用的高压下固体材料的Grüneisen状态方程。

Numerical simulation of large deformation using SPH meshless method has recently become a research hotspot. In this work, we used SPH of LS-DYNA to simulate particles impact in explosivedriven compaction process. Micro-jet flow and void collapse phenomena were mapped, supporting the theory of explosive-driven compaction. Additionally, Grüaneisen equation of state used in LS-DYNA code was obtained by the three-term equation of state and Rankine-Hugoniot relation.