Bending performance and failure mechanism of 3D-printed hybrid geometry honeycombs with various poisson’s ratios

IF 3.5 3区材料科学 Q1 ENGINEERING, MECHANICAL

Journal of Sandwich Structures & Materials Pub Date : 2023-08-09 DOI:10.1177/10996362231194713

Amin Montazeri, Amirhosein Hasani, M. Safarabadi

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引用次数: 2

Abstract

By utilizing 3D printing technology, experimental three-point bending (TPB) tests, and finite element analysis, six honeycomb structures with a variety of overall Poisson’s ratios (PR) are studied and compared in terms of bending properties and failure mechanisms. Four novel honeycombs that are designed by hybridizing hexagonal and re-entrant units outperform benchmark conventional honeycombs in terms of load-carrying capacity. Architected hybrid geometry honeycombs with zero PR show excellent specific energy absorption capability in comparison to benchmark honeycombs, absorbing approximately 136.9% and 475.1% more energy under TPB. 3D-printed honeycombs consisting of hexagonal units face layer separation damage mode under bending, while honeycombs with re-entrant cells in their lattice fail with joint shear due to the angle of their struts towards loadings. Designing honeycombs with a hybrid geometry lattice can enhance the load-carrying capacity, specific energy absorption, flexibility, and flexural modulus of the structure under bending. Due to their superior performance, the proposed architected hybrid geometry honeycombs with various Poisson’s ratios own promising applications in automotive, protective, and construction industries.

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不同泊松比3d打印混合几何蜂窝弯曲性能及破坏机理

利用3D打印技术、实验三点弯曲(TPB)试验和有限元分析，对6种具有不同总体泊松比(PR)的蜂窝结构的弯曲性能和破坏机制进行了研究和比较。由杂交六边形和可重入单元设计的四个新型蜂窝在承载能力方面优于基准传统蜂窝。与基准蜂巢相比，零PR的混合几何蜂巢表现出出色的比能量吸收能力，在TPB下吸收的能量分别增加了136.9%和475.1%。由六角形单元组成的3d打印蜂窝在弯曲作用下呈现层分离损伤模式，而晶格中含有可重入单元的蜂窝由于其支柱与荷载的夹角而发生节理剪切破坏。采用混合几何点阵设计蜂窝结构，可以提高结构的承载能力、比能吸收、柔度和弯曲模量。由于其优越的性能，所提出的具有各种泊松比的混合几何蜂巢在汽车、防护和建筑行业中有着广阔的应用前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Sandwich Structures & Materials 工程技术-材料科学：表征与测试

CiteScore

9.60

自引率

2.60%

发文量

审稿时长

7 months

期刊介绍： The Journal of Sandwich Structures and Materials is an international peer reviewed journal that provides a means of communication to fellow engineers and scientists by providing an archival record of developments in the science, technology, and professional practices of sandwich construction throughout the world. This journal is a member of the Committee on Publication Ethics (COPE).