内凹-反手性蜂窝结构的面内动态压溃性能研究

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Abstract A re-entrant anti-trichiral honeycomb(RATH) was designed by combining the re-entrant honeycomb and the anti-chiral honeycomb(ATH).The deformation modes, impact resistance, and auxetic performances of RATH with different impact velocities and relative densities were studied by using the dynamic explicit simulation software LS-DYNA.The results show that introducing the re-entrant structure can enhance the localized “necking” phenomenon of ATH under medium- and low-velocity impact and that a V-shaped deformation band appears near the impact end of RATH.Compared with the ATH and conventional honeycomb, the RATH has better energy absorption capacity and negative Poisson’s ratio effect.The empirical formulas for critical impact velocity and plateau stress were deduced based on the 1D shock theory and numerical simulation.In addition, the effects of the cell-wall thicknesses and crushing velocity on the plateau stress and plateau strain were systematically explored.This study is expected to provide a novel path for design of auxetic honeycombs with hybrid deformation mechanism.

Key words： re-entrant anti-trichiral honeycomb（RATH） deformation modes plateau stress specific energy absorption negative Poisson’s ratio

Received: 15 October 2019 Published: 28 February 2021

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	Articles by authors
	WEI Lulu
	YU Qiang
	ZHAO Xuan
	ZHU Guohua

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WEI Lulu,YU Qiang,ZHAO Xuan, et al. In-plane dynamic crushing characteristics of re-entrant anti-trichiral honeycomb[J]. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(4): 261-269.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2021/V40/I4/261

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