Improving structural damage tolerance and fracture energy via bamboo-inspired void patterns.

IF 3.1 3区计算机科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Bioinspiration & Biomimetics Pub Date : 2024-07-09 DOI:10.1088/1748-3190/ad5ba2

Xiaoheng Zhu, Jiakun Liu, Yucong Hua, Ottman A Tertuliano, Jordan R Raney

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Abstract

Bamboo has a functionally-graded microstructure that endows it with a combination of desirable properties, such as high failure strain, high toughness, and a low density. As a result, bamboo has been widely used in load-bearing structures. In this work, we study the use of bamboo-inspired void patterns to geometrically improve the failure properties of structures made from brittle polymers. We perform finite element analysis and experiments on 3D-printed structures to quantify the effect of the shape and spatial distribution of voids on the fracture behavior. The introduction of periodic, uniformly distributed voids in notched bend specimens leads to a 15-fold increase in the fracture energy relative to solid specimens. Adding a gradient to the pattern of voids leads to a cumulative 55-fold improvement in the fracture energy. Mechanistically, the individual voids result in crack blunting, which suppresses crack initiation, while neighboring voids redistribute stresses throughout the sample to enable large deformation before failure.

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通过竹子启发的空隙模式提高结构损伤耐受性和断裂能。

竹子具有功能分级的微观结构，使其兼具高破坏应变、高韧性和低密度等理想特性。因此，竹子被广泛应用于承重结构中。在这项工作中，我们研究了如何利用竹子启发的空隙模式从几何角度改善脆性聚合物结构的破坏特性。我们对三维打印结构进行了有限元分析和实验，以量化空隙的形状和空间分布对断裂行为的影响。在凹槽弯曲试样中引入周期性、均匀分布的空隙会导致断裂能相对于实体试样增加 15 倍。在空隙模式中加入梯度，可使断裂能累计提高 55 倍。从机理上讲，单个空隙会导致裂纹钝化，从而抑制裂纹的产生，而相邻空隙则会重新分配整个试样的应力，使试样在断裂前产生较大的变形。此外，我们还在具有激光切割空隙图案的 PMMA 板上进行了定性低能冲击实验，说明这种策略在提高各种材料系统的损伤容限和能量吸收方面具有更广泛的潜力。

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

Bioinspiration & Biomimetics 工程技术-材料科学：生物材料

CiteScore

5.90

自引率

14.70%

发文量

132

审稿时长

3 months

期刊介绍： Bioinspiration & Biomimetics publishes research involving the study and distillation of principles and functions found in biological systems that have been developed through evolution, and application of this knowledge to produce novel and exciting basic technologies and new approaches to solving scientific problems. It provides a forum for interdisciplinary research which acts as a pipeline, facilitating the two-way flow of ideas and understanding between the extensive bodies of knowledge of the different disciplines. It has two principal aims: to draw on biology to enrich engineering and to draw from engineering to enrich biology. The journal aims to include input from across all intersecting areas of both fields. In biology, this would include work in all fields from physiology to ecology, with either zoological or botanical focus. In engineering, this would include both design and practical application of biomimetic or bioinspired devices and systems. Typical areas of interest include: Systems, designs and structure Communication and navigation Cooperative behaviour Self-organizing biological systems Self-healing and self-assembly Aerial locomotion and aerospace applications of biomimetics Biomorphic surface and subsurface systems Marine dynamics: swimming and underwater dynamics Applications of novel materials Biomechanics; including movement, locomotion, fluidics Cellular behaviour Sensors and senses Biomimetic or bioinformed approaches to geological exploration.