DEM/FEM simulation for impact response of binary granular target and projectile
DEM/FEM simulation for impact response of binary granular target and projectile
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DOI：
10.1140/epjst/e2018-00071-3
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发表时间：
2018-09
期刊：
影响因子：
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通讯作者：
Shinnosuke Takeda;K. Ogawa;K. Tanigaki;Keitaro Horikawa;Hidetoshi Kobayashi
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文献类型：
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作者：
Shinnosuke Takeda;K. Ogawa;K. Tanigaki;Keitaro Horikawa;Hidetoshi Kobayashi
分别对随机分布的二元颗粒材料和圆柱形弹丸进行了三维动态离散元法（DEM）和有限元法（FEM）模拟，以阐明靶颗粒尺寸分布对低密度颗粒材料动力学行为的影响。结果表明，弹丸侵彻过程中的峰值阻力与颗粒材料的堆积密度和弹丸的撞击速度有关。阻力的变化与应力波在弹丸中的传播和反射有关。粒径的变化对弹丸阻力几乎没有影响。颗粒材料撞击后在弹丸前方产生致密区。致密区沿深度方向扩展，其扩展速度取决于靶颗粒材料的堆积密度和弹丸的撞击速度。也就是说，颗粒材料的弹丸冲击行为可以由颗粒材料的冲击速度和堆积密度均匀地处理，而不依赖于颗粒尺寸的变化。
Three-dimensional dynamic discrete element method (DEM) and finite element method (FEM) simulation using LS-DYNA were, respectively, applied to the randomly distributed binary granular material and to the cylindrical projectiles in order to clarify the effect of size distribution of target particles on the dynamic behaviour of low density granular material. It was found that the peak resistance force of projectile during penetration depends on the packing density of the granular materials and on the impact velocity of projectile. The change of resistance force was well understood in connection with the propagation and the reflection of stress wave in projectile. The variety of particle size almost did not affect the resistance force of projectile. Densified region in granular material was generated ahead of projectile after impact. The densified region propagated in the depth direction and its propagation speed depended on the packing density of target granular material and impact velocity of projectile. That is, projectile impact behaviours of granular materials can be uniformly handled by impact velocity and packing density of the granular material, not depending on the variety of the particle size.