冲击下材料质量混合的实验研究及离散元模拟

龚平; 唐志平; 沈兆武

doi:10.11858/gywlxb.2004.01.005

冲击下材料质量混合的实验研究及离散元模拟

doi: 10.11858/gywlxb.2004.01.005

中国科学技术大学力学和机械工程系，中国科学院材料力学行为和设计重点实验室，安徽合肥 230026

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通讯作者:
龚平

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出版历程
- 收稿日期: 2003-06-18
- 修回日期: 2003-08-25
- 刊出日期: 2004-03-05

Experimental Investigation and DEM Simulation of Mass Mixing under Shock Loading

Department of Modern Mechanics, Key Laboratory of Mechanical Behavior and Design of Materials (LMBD), University of Science and Technology of China, Hefei 230026, China

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Corresponding author: GONG Ping

摘要

摘要: 利用化爆驱动飞片对铅-锡和铜-铝的颗粒混合物进行冲击加载。回收样品的金相分析发现，在锡颗粒边界有明显的铅锡质量混合带，带宽约60~80 m。利用扫描电镜对混合带进行点扫描，得到带内铅和锡质量分布。计算出的铅锡动态扩散系数为D=0.9 cm2/s，远高于准静态。利用离散元方法进行了数值模拟，定性的显示了高速冲击下材料细观混合的过程和机理。
- 质量混合 /
- 冲击加载 /
- 铅-锡 /
- 动态扩散系数 /
- 离散元
Abstract: Tin and lead beads are chosen to conduct the high velocity impact experiments with an explosive plane wave generator. The impact velocity is about 2 km/s. A metallurgic picture of the recovered specimen shows that there are four bands along the interfaces between tin and lead. The width across the bands is about 60~80 m. The SEM examination discloses that these bands are the mass mixing regions of tin and lead. The dynamic diffusion coefficient of the experiments is 0.9 cm2/s, which is much higher than that at quasi-static case. A discrete element simulation (DEM) demonstrates the process and mechanisms of the observed mass mixing for Pb-Sn beads under shock loading at meso-scale qualitatively.
- mass mixing /
- shock loading /
- Pb-Sn /
- dynamic diffusion coefficient /
- DEM

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参考文献(15)

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