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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Shock Loading of Granular Ni/AI Composites. Part 1: Mechanics of Loading
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Shock Loading of Granular Ni/AI Composites. Part 1: Mechanics of Loading

机译：Ni / Al颗粒状复合材料的冲击载荷。第1部分：加载力学

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摘要

We present molecular dynamics simulations of the thermomechanical response under shock loading of a granular material consisting of laminated Ni/Al grains. We observe two regimes: At low piston velocities (u_p < lkm/s), the shock wave is diffuse, and the width of the shock front decreases with increasing piston velocity. Beyond a critical shock strength, however, the width remains relatively constant at approximately the mean grain radius. This change in behavior follows from an evolution of the mechanism of compaction with increasing insult strength. The mechanism evolves from plastic deformation-mediated pore collapse for relatively weak shocks, to solid extrusion and fluid ejecta filling pores ahead of the shock front at intermediate strengths, and finally to atomic jetting into the pore for very strong shocks (u_p >2 km/s). High-energy fluid ejecta into pores leads to the formation of flow vorticity and can. result in a large fraction of the input energy localizing into translational kinetic energy components in addition to the formation of hot spots. This has implications for the mechanical mixing of Ni and Al in these reactive composites.
机译：我们介绍了由镍/铝层压颗粒组成的粒状材料在冲击载荷下的热力学响应的分子动力学模拟。我们观察到两种情况：在低活塞速度（u_p 2 km / s）。高能流体喷射到孔隙中会导致形成流动涡流和罐头。除了形成热点外，还会导致很大一部分输入能量局限于平移动能分量。这对这些反应性复合物中Ni和Al的机械混合具有影响。

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