Investigation on the dynamic response characteristics of hexagonal chiral honeycombs

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (8) : 1-7.

Zhang Xin-chun, Zhu Xiao-yan, Li Na

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Abstract

The in-plane dynamic crushing behaviors of hexachiral honeycombs have been numerically studied by means of explicit dynamic finite element (EDFE) simulations using ANSYS/LS-DYNA. Under the assumption that the circular radii are all the same, the FE models of hexachiral honeycombs are firstly established by the variation of ligament length and cell-wall thickness. The respective influences of the impact velocity and micro-cell structural parameters on the in-plane macro-/micro-deformation behaviors, densification strains, the dynamic plateau stresses and the specific energy absorption of chiral honeycombs are discussed in detail. Numerical results show that there will appear three different types of deformation modes for hexachiral honeycombs with increasing the impact velocity, that is, “> <” mode, “transition” mode and “I” mode. Under low or moderate velocity crushing, the hexachiral honeycombs display the particular lateral compression “shrinkage” phenomenon of auxetic materials, which mainly depends upon the rotation deformation of the ligament on the central node. By introducing a non-dimensional “dynamic sensitivity index”, the in-plane dynamic enhancement effect of hexachiral honeycombs is also investigated in this paper.

Key words

hexachiral honeycomb / plateau stress / deformation modes / dynamic enhancement / negative Poison’s ratio (NPR)

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Zhang Xin-chun, Zhu Xiao-yan, Li Na . Investigation on the dynamic response characteristics of hexagonal chiral honeycombs[J]. Journal of Vibration and Shock, 2016, 35(8): 1-7

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