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The adaptive finite element material point method for simulation of projectiles penetrating into ballistic gelatin at high velocities
Engineering Analysis With Boundary Elements ( IF 3.3 ) Pub Date : 2020-05-23 , DOI: 10.1016/j.enganabound.2020.03.022
Feng Chen , Rong Chen , Banghai Jiang

The adaptive finite element material point method (AFEMP) takes advantages of both finite element method (FEM) and material point method (MPM), suitable for dealing with extreme deformation problems. Use AFEMP to simulate the penetration of steel spheres and bullets into ballistic gelatin at high velocities to better understand the damage effects caused by the projectiles to biological soft tissue. Gelatin are initially divided into finite elements and then the elements are converted into MPM particles using the characteristic length ratio and the main direction maximum stretch ratio of element as conversion criteria in order to avoid elements distortion during the solution process. The effect of the background grid size on the calculation results is studied, and the background grid should be slightly smaller than finite element so that it can better describe the severely compressed gelatin. Numerical results are presented to validate the accuracy of AFEMP program of this work, and it can better simulate the temporary cavity than the commercial software LS-DYNA. The propagation of pressure wave can cause crushing and tearing damage of the gelatin. The damaged area caused by pressure wave is larger than the temporary cavity, and its shape is closer to the cylinder with the increase of the speed of the steel sphere. The velocity and shape of projectile play a decisive role in the damage effects.



中文翻译:

高速射弹弹道明弹模拟的自适应有限元材料点方法

自适应有限元材料点方法(AFEMP)充分利用了有限元方法(FEM)和材料点方法(MPM)的优势,适用于处理极端变形问题。使用AFEMP模拟钢球和子弹在高速情况下向弹道明胶的渗透,以更好地了解弹丸对生物软组织的破坏效果。明胶首先被分为有限元素,然后使用元素的特征长度比和主方向最大拉伸比作为转换标准将元素转换为MPM颗粒,以避免在固溶过程中元素变形。研究了背景网格尺寸对计算结果的影响,并且背景网格应略小于有限元,以便可以更好地描述严重压缩的明胶。数值结果证明了该程序的准确性,并且比商用软件LS-DYNA可以更好地模拟临时腔。压力波的传播会引起明胶的压碎和撕裂损坏。随着钢球速度的增加,压力波引起的损伤面积大于临时腔,其形状更接近圆柱体。弹丸的速度和形状在破坏效果中起决定性作用。与商用软件LS-DYNA相比,它可以更好地模拟临时空腔。压力波的传播会引起明胶的压碎和撕裂损坏。随着钢球速度的增加,压力波引起的损伤面积大于临时腔,其形状更接近圆柱体。弹丸的速度和形状在破坏效果中起决定性作用。与商用软件LS-DYNA相比,它可以更好地模拟临时空腔。压力波的传播会引起明胶的压碎和撕裂损坏。随着钢球速度的增加,压力波引起的损伤面积大于临时腔,其形状更接近圆柱体。弹丸的速度和形状在破坏效果中起决定性作用。

更新日期:2020-05-23
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