负泊松比曲边内凹蜂窝结构的面内冲击动力学数值研究

doi:10.3969/j.issn.1004-132X.2020.16.013

摘要/Abstract

摘要： 利用数值方法研究了具有负泊松比效应的可变弧角曲边内凹蜂窝结构的面内冲击动力学性能，讨论了冲击速度和弧角对曲边内凹蜂窝结构的变形模式与吸能能力的影响。研究结果表明：改变冲击速度和弧角的大小会影响曲边内凹蜂窝结构的变形失效模式；当冲击速度较高时，蜂窝结构内的应力波动范围较大，结构的体能量吸收值随弧角的增大逐渐增大；当冲击速度较低时则不存在上述现象。当弧角大于120°时，曲边内凹蜂窝结构具有负泊松比效应，该结构的吸能能力高于其他弧角所对应的正泊松比蜂窝结构的吸能能力，该现象与冲击速度无关。

关键词: 负泊松比, 曲边内凹蜂窝结构, 可变弧角, 数值模拟, 变形失效模式

Abstract: The in-plane impact dynamics properties of the negative Poisson's ratio effect honeycomb structures with variable arc angle curved concave sides were studied by using numerical method. The effects of the impact velocities and arc angles on the deformation failure mode and the energy absorption capacity of the honeycomb structures with curved concave sides were discussed. The results show that changing the impact velocities and arc angles has effects on the deformation failure mode of the honeycomb structures with curved concave sides. When the impact velocity is high, the stress fluctuation ranges of the honeycomb structures are large and the energy absorption value per unit volume of the structures increases with the increasing of the arc angles. The above phenomenon does not exist when the impact velocity is low.When the arc angle is larger than 120°, the honeycomb structures with curved concave sides have negative Poisson's ratio effect, and the energy absorption capacity of the structures are higher than that with positive Poisson's ratio honeycomb structures corresponding to other arc angles, where the phenomenon is independent of the impact velocity.

Key words: negative Poisson's ratio, honeycomb structure with curved concave side, variable arc angle, numerical simulation, deformation failure mode

中图分类号:

O342
TB383

沈建邦;肖俊华;梁希;徐耀玲. 负泊松比曲边内凹蜂窝结构的面内冲击动力学数值研究[J]. 中国机械工程, DOI: 10.3969/j.issn.1004-132X.2020.16.013.

SHEN Jianbang;XIAO Junhua;LIANG Xi;XU Yaoling. Numerical Study on In-plane Impact Dynamics of Negative Poisson's Ratio Honeycomb Structures with Curved Concave Sides[J]. China Mechanical Engineering, DOI: 10.3969/j.issn.1004-132X.2020.16.013.

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http://www.cmemo.org.cn/CN/Y2020/V31/I16/1998

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