Open Access

ARTICLE

In-Plane Impact Dynamics Analysis of Re-Entrant Honeycomb with Variable Cross-Section

Yuanxun Ou^1,2, Shilin Yan^1,2, Pin Wen^1,2,*
1 Department of Engineering Structure and Mechanics, Wuhan University of Technology, Wuhan, 430070, China
2 Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics, Wuhan, 430070, China
* Corresponding Author: Pin Wen. Email:
(This article belongs to this Special Issue: Modeling of Heterogeneous Materials)

Computer Modeling in Engineering & Sciences 2021, 127(1), 209-222. https://doi.org/10.32604/cmes.2021.014828

Received 02 November 2020; Accepted 11 December 2020; Issue published 30 March 2021

Abstract

Due to the unique deformation characteristics of auxetic materials (Poisson’s ratio ), they have better shock resistance and energy absorption properties than traditional materials. Inspired by the concept of variable cross-section design, a new auxetic re-entrant honeycomb structure is designed in this study. The detailed design method of re-entrant honeycomb with variable cross-section (VCRH) is provided, and five VCRH structures with the same relative density and different cross-section change rates are proposed. The in-plane impact resistance and energy absorption abilities of VCRH under constant velocity are investigated by ABAQUS/EXPLICIT. The results show that the introduction of variable cross-section design can effectively improve the impact resistance and energy absorption abilities of auxetic re-entrant honeycombs. The VCRH structure has better Young’s modulus, plateau stress, and specific energy absorption (SEA) than traditional re-entrant honeycomb (RH). The influence of microstructure parameters (such as cross-section change rate ) on the dynamic impact performance of VCRH is also studied. Results show that, with the increase in impact velocity and , the plateau stress and SEA of VCRH increase. A positive correlation is also found between the energy absorption efficiency, impact load uniformity and under both medium and high impact speeds. These results can provide a reference for designing improved auxetic re-entrant honeycomb structures.

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Keywords

Auxetic re-entrant honeycombs; variable cross-section design; in-plane impact; finite element simulation

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