Impact resistance of new cross negative Poisson&rsquo;s ratio honeycomb structure

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (11) : 183-192.

Impact resistance of new cross negative Poisson’s ratio honeycomb structure

LIU Tao1, XIAO Zhengming1, HUANG Jiangcheng1, LIU Weibiao2

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Abstract

Negative Poisson's ratio mechanical metamaterials have attracted the attention of scholars because of their advantages in high designability, lightweight and impact resistance. Classical configurations such as concave hexagonal structure and chiral structure have been extensively studied. In this paper, a new type of cross negative Poisson's ratio honeycomb structure is proposed. Based on the energy method, the Poisson's ratio of the structure is derived. The analytical solution is in good agreement with the finite element results, which proves the effectiveness of the derivation method. The deformation mode, nominal stress-strain curve and energy absorption characteristics of cross honeycomb structure with different impact velocity and rod length ratio coefficient are studied. The results show that the smaller the ratio coefficient of rod length is, the smaller the Poisson's ratio is. The impact velocity and rod length ratio coefficient affect the deformation mode, the nominal stress-strain curve and the platform stress of the cross honeycomb structure under impact load. The body energy absorption of cross honeycomb structure will accelerate with the increase of strain at medium speed, while the growth trend of energy absorption is no longer accelerated with the increase of strain at high speed but shows regular wavy growth.

Key words

negative Poisson’s ratio / cross-shaped cellular structure / energy method / deformation modes / energy absorption

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LIU Tao1, XIAO Zhengming1, HUANG Jiangcheng1, LIU Weibiao2. Impact resistance of new cross negative Poisson’s ratio honeycomb structure[J]. Journal of Vibration and Shock, 2023, 42(11): 183-192

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