冲击载荷下孔隙塌缩过程的数值模拟

爆炸压实过程中多孔体的孔隙闭合程度对压实效果起着决定性作用。利用LS-DYNA有限元程序，对无氧铜中的圆形孔隙塌缩过程进行了数值模拟。根据模拟结果分析得出，在6 GPa的冲击压力下，孔隙闭合时不同边界区域会发生爆炸焊接和射流侵彻，这2种结合机理可以使材料结合更牢固，提高材料的致密度和机械强度，实现高质量的爆炸压实。

Numerical simulation of the process of pore collapse under shock load

To explore the compaction mechanism of porous materials under explosive loading,the process of the circular shape pore collapse in oxygen-free copper was numerically simulated by using the LS-DYNA finite element code.Simulated results indicate that explosive welding and jet penetration can appear in the different boundary regions during pore collapse under the shock pressure of 6 GPa.These two bonding modes can improve the bonding compactness of the boundary material and enhance the density and mechanical s...