冲击载荷下孔隙塌缩过程的数值模拟

Numerical simulation of the process of pore collapse under shock load

1.
College of Power Engineering, Nanjing University of Science & Technology,Nanjing 210094, Jiangsu, China;
2.
Department of Engineering Mechanics, Dalian University of Technology,The State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian 116024, Liaoning, China

摘要: 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。
- 爆炸力学 /
- 孔隙塌缩 /
- LS-DYNA有限元程序 /
- 冲击载荷 /
- 爆炸压实
Abstract: 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 strength of the block materials obtained by explosive compaction possess.
- mechanics of explosion /
- pore collapse /
- numerical simulation /
- shock load /
- explosive compaction