内凹三角形负泊松比材料的面内冲击动力学性能

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (17) : 81-87.

论文

马芳武，梁鸿宇，赵颖，陈实现，蒲永锋

作者信息 +

In-plane impact dynamic performance of concave triangle material with negative Poisson’s ratio

MA Fangwu, LIANG Hongyu, ZHAO Ying, CHEN Shixian, PU Yongfeng

Author information +

文章历史 +

摘要

本文提出了一种内凹三角形负泊松比材料，在保证元胞其他几何参数不变的前提下，通过改变三角形侧边内凹角度，建立了不同内凹形式的内凹三角形负泊松比材料模型。通过显式动力有限元软件LS-DYNA具体分析了内凹形式与冲击速度对内凹三角形负泊松比材料面内冲击变形和能量吸收能力的影响。研究结果表明：冲击载荷作用下，在冲击端，相对于三边内凹的情况，单边内凹的平台应力更大；在固定端，侧边内凹程度越小，输出应力滞后时间越长。相比于内凹六边形负泊松比材料，内凹三角形负泊松比材料吸能更平稳，压缩量也更大，并随着冲击速度的提高，内凹三角形负泊松比材料表现出更强的能量吸收能力。

Abstract

A concave triangle material with negative Poisson’s ratio was proposed.Under the premise of other geometric parameters of cellular being unchanged, models of this material with different concave forms were established through changing side concave angle of triangle.Using the explicit dynamic finite element software LS-DYNA, effects of concave form and impact velocity on in-plane impact deformation and energy absorption ability of this material were analyzed.Results showed that under in-plane impact loads, plateau stress at impacted end with single side being concave is larger than that with all sides being concave; at fixed end, the smaller the side’s concave degree, the longer the output stress delay time; compared to concave hexagon material with negative Poisson’s ratio, this material absorbs energy more smoothly and its compression amount is larger; with increase in impact velocity, this material reveals a stronger energy absorption ability.

导出引用

马芳武，梁鸿宇，赵颖，陈实现，蒲永锋. 内凹三角形负泊松比材料的面内冲击动力学性能[J]. 振动与冲击, 2019, 38(17): 81-87

MA Fangwu, LIANG Hongyu, ZHAO Ying, CHEN Shixian, PU Yongfeng. In-plane impact dynamic performance of concave triangle material with negative Poisson’s ratio[J]. Journal of Vibration and Shock, 2019, 38(17): 81-87

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