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Mean in-plane plateau stresses of hexagonal honeycomb cores under impact loadings

机译:冲击载荷下六角形蜂窝芯的平均平面内平台应力

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摘要

Double-walled hexagonal honeycomb cores (DHHCs) are important cushioning materials and their configuration parameters and impact velocities have effects on their impact properties. In this paper, the finite element (FE) model by using ANSYS/LS-DYNA was to investigate the relations between configuration parameters of DHHCs and their mean in-plane plateau stresses at impact velocities from 3 to 250 m/s. When all configuration parameters are kept constant, mean in-plane dynamic plateau stresses are proportional to the square of impact velocities. For the given impact velocity, mean in-plane dynamic plateau stresses are related to the ratios between cell wall thicknesses and cell edge length by power laws, to cell edge length ratios by exponential laws and to expanding angels by conic curves. Based on the FE calculated results, many empirical formulas and a feasible method to be used to calculate mean in-plane dynamic and static plateau stresses of DHHCs are suggested.
机译:双壁六边形蜂窝状芯材(DHHC)是重要的缓冲材料,其结构参数和冲击速度会影响其冲击性能。本文利用ANSYS / LS-DYNA有限元(FE)模型研究了DHHC的构型参数与其在3至250 m / s的冲击速度下的平均平面内平台应力之间的关系。当所有配置参数保持恒定时,平均平面内动态平稳应力与冲击速度的平方成比例。对于给定的冲击速度,平均平面内平台平稳应力与幂律相关的孔壁厚度与孔边缘长度的比值,与幂律相关的孔边缘长度比与圆锥曲线相关的展开角度有关。根据有限元的计算结果,提出了许多经验公式和可行的方法来计算DHHC的平均平面内动和静态平台应力。

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