Open Access

ARTICLE

Impact Performance Research of Re-Entrant Octagonal Negative Poisson’s Ratio Honeycomb with Gradient Design

Yiyuan Li¹, Yongjing Li^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, School of Science, Wuhan University of Technology, Wuhan, 430070, China

* Corresponding Authors: Shilin Yan. Email: ; Pin Wen. Email:

(This article belongs to the Special Issue: Advanced Structural Optimization Methods and their Applications in Designing Metamaterials)

Computer Modeling in Engineering & Sciences 2024, 140(3), 3105-3119. https://doi.org/10.32604/cmes.2024.051375

Received 04 March 2024; Accepted 21 May 2024; Issue published 08 July 2024

Abstract

Based on the traditional re-entrant honeycomb, a novel re-entrant octagon honeycomb (ROH) is proposed. The deformation mode of the honeycomb under quasi-static compression is analyzed by numerical simulation, and the results are in good agreement with the experimental ones. The deformation modes, mechanical properties, and energy absorption characteristics of ROH along the impact and perpendicular directions gradient design are investigated under different velocities. The results indicated that the deformation mode of ROH is affected by gradient design along the direction of impact and impact speed. In addition, gradient design along the direction of impact can increase the initial peak stress of ROH and accelerate its densification phase. Gradient design perpendicular to the impact direction can enhance the energy absorption performance of ROH, especially for ROH, with wall thickness increasing from the inside outwards. Compared to ROH with uniform wall thickness at the same relative density, ROH with a gradient design can increase the plateau stress by over half. With the elevation of impact velocity, the plateau stress and specific energy absorption exhibit an upward trend, aligning with the dynamic performance pattern observed in conventional honeycombs. The results can be used as a reference for the design and application of honeycomb and provide a new idea for developing more efficient and reliable energy-absorbing materials.

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Keywords

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