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Dynamic crushing analysis of a circular honeycomb with leaf vein branched characteristic
Mechanics of Materials ( IF 3.9 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.mechmat.2020.103566
Qiang He , Yonghui Wang , Hang Gu , Jun Feng , Honggen Zhou

Abstract For further improving the mechanical properties of the traditional honeycomb structure, a new excellent energy absorption structure named as the leaf vein branched honeycomb (LVBH) is proposed based on lotus leaf vein branched structure. The in-plane dynamic crushing of LVBH is numerically studied by LS-DYNA. Meanwhile, the crushing behavior of the regular circular honeycomb is carried out for comparison. The introduction of leaf vein branched characteristics affects the local deformation zone and the deformation mechanism of LVBHs can be classified into three categories: quasi-static mode, transition mode and dynamic mode. The mode classification map is further given. The comparison indicates that LVBH has better energy absorption performance with 79.94% higher specific energy absorption per unit mass ( S E A m ) than regular circular honeycomb (RCH). Following that, the influence of microstructure, relative density and crushing velocity on the energy absorbing characteristics of LVBH is systematically studied. The LVBHs with moderate structural parameters exhibit better mechanical properties. The quasi-static plateau stress depends upon the unit-cell configuration. Based on one-dimensional shock theory, the empirical equations of dynamic plateau stress for LVBHs with different relative densities are given by using least-square fitting. Furthermore, the numerical results show that the part of the outer-circle and branch-vein cell walls have higher energy absorption efficiency. The specific energy absorption per unit mass ( S E A m ) of LVBH can increase by 12.4% through the thickness matching between main-vein and the branch-vein cell walls. The results of this study will be helpful to design a novel honeycomb structure with better energy absorption ability.

中文翻译:

具有叶脉分支特征的圆形蜂窝的动态破碎分析

摘要 为进一步提高传统蜂窝结构的力学性能,基于荷叶静脉分支结构提出了一种新型的优良吸能结构,称为叶静脉分支蜂窝(LVBH)。LS-DYNA对LVBH的面内动态破碎进行了数值研究。同时,对规则圆形蜂窝的破碎行为进行了比较。叶脉分支特征的引入会影响局部变形区,LVBHs的变形机制可分为三类:准静态模式、过渡模式和动态模式。进一步给出了模式分类图。对比表明LVBH的能量吸收性能更好,为79。每单位质量的比能量吸收 (SEA m) 比常规圆形蜂窝 (RCH) 高 94%。随后,系统研究了微观结构、相对密度和破碎速度对LVBH能量吸收特性的影响。具有中等结构参数的 LVBHs 表现出更好的机械性能。准静态平台应力取决于晶胞结构。基于一维冲击理论,采用最小二乘法拟合给出了不同相对密度下LVBHs动态平台应力的经验方程。此外,数值结果表明,外圆和分支静脉细胞壁的部分具有更高的能量吸收效率。LVBH 的单位质量比能量吸收 (SEA m) 可增加 12。4% 通过主静脉和分支静脉细胞壁之间的厚度匹配。该研究结果将有助于设计一种具有更好能量吸收能力的新型蜂窝结构。
更新日期:2021-02-01
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