In-plane characteristics of a multi-arc re-entrant auxetic honeycomb with enhanced negative Poisson's ratio effect and energy absorption

IF 4.4 2区 工程技术 Q1 MECHANICS European Journal of Mechanics A-Solids Pub Date : 2024-10-19 DOI:10.1016/j.euromechsol.2024.105473
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Abstract

Based on conventional re-entrant auxetic honeycomb (CRAH), a multi-arc re-entrant auxetic honeycomb (MARAH) is proposed. The mechanical properties of the honeycomb can be significantly improved by introducing multiple arcs. Through theoretical analysis, finite element analysis, and experiment, the influence of arc radius, arc angle, and cell wall thickness on effective Poisson's ratio, effective Young's modulus, energy absorption, and stress level are investigated. There are significant differences between MARAH and CRAH in Poisson's ratio, deformation mode, stress level, and energy absorption. Compared with CRAH, MARAH has a better negative Poisson's ratio effect, wider Poisson's ratio adjustable range, better energy absorption, and superior stability. In addition, the reduction of the yield stress can effectively reduce the damage of impact load on the honeycomb. The research results can provide new ideas for the design and application of new metamaterials.
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具有增强负泊松比效应和能量吸收功能的多弧重入式辅助蜂窝的面内特性
在传统的重入射辅助蜂窝(CRAH)基础上,提出了一种多弧重入射辅助蜂窝(MARAH)。通过引入多弧,蜂窝的力学性能可得到显著改善。通过理论分析、有限元分析和实验,研究了圆弧半径、圆弧角度和蜂窝壁厚对有效泊松比、有效杨氏模量、能量吸收和应力水平的影响。MARAH 和 CRAH 在泊松比、变形模式、应力水平和能量吸收方面存在明显差异。与 CRAH 相比,MARAH 具有更好的负泊松比效应、更宽的泊松比可调范围、更好的能量吸收能力和更高的稳定性。此外,屈服应力的降低能有效减少冲击载荷对蜂窝的破坏。这些研究成果可为新型超材料的设计和应用提供新思路。
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来源期刊
CiteScore
7.00
自引率
7.30%
发文量
275
审稿时长
48 days
期刊介绍: The European Journal of Mechanics endash; A/Solids continues to publish articles in English in all areas of Solid Mechanics from the physical and mathematical basis to materials engineering, technological applications and methods of modern computational mechanics, both pure and applied research.
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