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Experimental and Numerical Investigation on In-plane Impact Behaviour of Chiral Auxetic Structure by Dianwei Gao; Shuhong Wang; Mingzhong Zhang; Chunwei Zhang is a Engineering article available to read on EtoBox.

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This paper presents an experimental study on impact behaviour and plastic evolution of chiral structure subjected to in-plane impact loading using a Split Hopkinson pressure bar (SHPB). The finite element (FE) model developed in ABAQUS/Explicit was validated and utilized for parametric study, and further developed as an extension of experimental work. The impact scenarios from both structure itself and external input are considered, including relative density, topology parameter r/R and initial impact energy. Results indicate that chiral structure exhibits three critical failure modes corresponding to various impact velocities ranging from 5 m/s to 50 m/s. Interestingly, chiral structure occurs with two densification stages induced by ligaments-dominated and nodes-dominated crushing deformation, respectively, proving the capability of independent energy management mechanism. Increasing the value of relative density from 0.19 to 0.39 contributes to a maximum of 250% increase in the specific energy absorption (SEA). Although increasing the value of r/R from 0.04 to 0.2 can dramatically decrease Poisson's ratio (PR) from 0.07 to -0.63 (significant negative PR), high strainrate depende

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Author

Dianwei Gao; Shuhong Wang; Mingzhong Zhang; Chunwei Zhang

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Engineering (Physical Sciences)