Mechanical and Energy-Absorption Properties of a 3D-Printed Star-Shaped Auxetic Honeycomb under Combined Compression-Shear Loading

Geng Luo; Duanyu Mo; Chengpeng Chai; Junzhe Liu; Yisong Chen

doi:10.1590/1679-78257624

Mechanical and Energy-Absorption Properties of a 3D-Printed Star-Shaped Auxetic Honeycomb under Combined Compression-Shear Loading

Authors

Geng Luo School of Automobile, Chang’an University, Xi’an, 710064, China https://orcid.org/0000-0002-2498-7685
Duanyu Mo School of Automobile, Chang’an University, Xi’an, 710064, China https://orcid.org/0009-0006-0869-8484
Chengpeng Chai School of Automobile, Chang’an University, Xi’an, 710064, China https://orcid.org/0009-0003-1492-3789
Junzhe Liu School of Automobile, Chang’an University, Xi’an, 710064, China https://orcid.org/0009-0001-5118-0334
Yisong Chen School of Automobile, Chang’an University, Xi’an, 710064, China https://orcid.org/0000-0002-7093-2597

DOI:

https://doi.org/10.1590/1679-78257624

Abstract

In this study, we investigated the mechanical and energy-absorption properties of a star-shaped auxetic honeycomb under combined compression-shear loading. Novel fixtures were designed to conduct quasi-static combined compression-shear loadings. Experimental and numerical results show that the honeycomb undergoes an overall deformation based on cell rotation under quasi-static loading, producing an inclined deformation band. The normal yield stress decreased, and the shear yield stress increased with an increase in the loading angle. The extrusion deformation between meso-structures became more sufficient under dynamic combined loadings. The material deformation mode changed from overall deformation to local deformation accompanied by the formation of a shock wave. The yield criteria were established based on the ellipse equation. With an increase in the loading angle, the energy absorption in the normal and shear directions of the materials showed downward and upward trends, respectively. A theoretical model was proposed based on the 1D shock wave model to predict the energy-absorption behaviour under dynamic loading.

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Published

2023-04-20

Issue

Vol. 20 No. 3 (2023)

Section

Articles

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