Mechanical properties of star-shaped auxetic honeycomb material under compression-shear composite loading

被引：0
|
作者：
Luo G. [1 ,2 ]
Mo D. [1 ]
Liu J. [1 ]
Chai C. [1 ]
Chen Y. [1 ]
机构：
[1] School of Automobile, Chang’an University, Xi’an
[2] State Key Lab of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2023年 / 42卷 / 13期
关键词：
auxetic material; complex loading; energy absorptionproperty; star honeycomb; yield surface;
D O I：
10.13465/j.cnki.jvs.2023.13.022
中图分类号：
学科分类号：
摘要：
Because of its good mechanical properties and stable energy absorption properties, auxetic honeycomb material is widely used in various protective structures. Here, mechanical properties of star-shapedauxetic honeycomb material under compression-shear composite loading were studied. Firstly, the numerical model of star-shapedauxetic honeycomb material was established based on the finite element method, verification tests were conducted based on additive material manufacturing technique and universal testing machine, and simulation study on mechanical properties and deformation modes ofstar-shaped auxetic honeycomb material under various loading conditions, such as, different compression-shear loading angles and speedswas performed. The results showed that under quasi-static composite loading, star-shaped auxetic honeycomb material undergoes overall deformation relying on cell rotation, and produces inclined deformation band collapse ; with increase in loading speed, due to enhancement of inertial effect, extrusion deformation among micro-structures is more sufficient, and material deformation mode changes from overall deformation to local deformation to form shock waves ; based on the elliptic equation, initial yield stress of star-shaped auxetic honeycomb material is fitted to establish quasi-static/dynamic yield surface of star-shaped auxetic honeycomb material ; with increase in loading speed, yield surface has obvious strengthening. Finally, study on energy absorption property of star-shaped auxetic honeycomb material showedthat with increase in loading angle, normal and tangential total energy absorptions of the material have downward and upward trends, respectively ; tangential energy absorption propertyis more sensitive to change of loading angle than normal energy absorption property be. © 2023 Chinese Vibration Engineering Society. All rights reserved.
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页码：183 / 192
页数：9
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