微元胞缺失下三星型微结构面内动态性能分析

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (10) : 115-123.

论文

赵颖，王凯锋，施劲余，桑叶，李云伍，陈宇，殷举伞

作者信息 +

In-plane dynamic performances of a tristar cellular structure under the lack of unit cell

ZHAO Ying，WANG Kaifeng，SHI Jinyu，SANG Ye，LI Yunwu，CHEN Yu，YIN Jusan

Author information +

文章历史 +

摘要

由于制造精度和生产工艺等原因，微结构材料内部往往会出现胞元缺失，从而对其整体性能产生影响。本文以三星型微结构为研究对象，首先采用准静态压缩试验对模型可靠性进行了验证，其次，通过有限元软件Hyperworks和显示动力有限元软件LS-DYNA对其进行联合仿真分析，得到了不同冲击速度和不同微元胞缺失数目下该三星型微结构的变形模式、应力-应变曲线、吸能曲线和平台应力对比曲线。结果表明，当冲击速度处于一定范围（20-80m/s）时，微元胞缺失数目越多,三星型微结构的负泊松比效应越弱，从而平台应力显著降低，吸能特性减弱。而在微元胞缺失数目相同的条件下，冲击速度越高，平台应力越大，吸能量越多。该研究为其在车辆吸能件中的应用提供数据支持。

Abstract

Due to the reasons of manufacturing precision and production technology, the phenomenon of lacking unit cell always comes up in cellular structure inside, which can affect overall performances of cellular structure. This paper puts forward a tristar cellular structure with the characteristic of negative Poisson’s ratio (NPR). Firstly, the reliability of finite element model is verified by quasi-static compression test. Then, the joint-simulation analysis is carried out with the adoption of Hyperworks and LS-DYNA software. Eventually, deformation modes, stress-strain curves, energy absorption curves and platform stress curves of this cellular structure are obtained under the conditions of various impact velocities and different numbers of lacking unit cells. The results indicate that as the impact velocity is within the range from 20m/s to 80 m/s, the NPR characteristics turn to be less obvious with the increase of the number of lacking unit cells, energy absorption performances become weakened and the platform stress significantly decreases. The higher impact velocity is, higher energy absorption and platform stress can be acquired under the same number of lacking unit cells. This study can provide data support for its further application on energy absorber.

导出引用

赵颖，王凯锋，施劲余，桑叶，李云伍，陈宇，殷举伞. 微元胞缺失下三星型微结构面内动态性能分析[J]. 振动与冲击, 2022, 41(10): 115-123

ZHAO Ying，WANG Kaifeng，SHI Jinyu，SANG Ye，LI Yunwu，CHEN Yu，YIN Jusan. In-plane dynamic performances of a tristar cellular structure under the lack of unit cell[J]. Journal of Vibration and Shock, 2022, 41(10): 115-123

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