Toughening mechanism of crack bridging in bioinspired Bouligand structures

IF 4.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Acta Mechanica Sinica Pub Date : 2026-05-07 DOI:10.1007/s10409-025-25650-x

Yunqing Nie (, ), Dongxu Li (, )

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引用次数: 0

Abstract

The bioinspired Bouligand structure is a hierarchical and non-homogeneous architecture, which has been observed in lamellar bone and the exoskeleton of lobsters. It exhibits excellent damage-resistant performance. However, toughening mechanisms in this structure are still not clear. This paper presents a multiscale fracture model to reveal the toughening mechanisms of crack bridging. Firstly, the anisotropic property is derived based on the micro-structural parameters. Then, the crack-bridging model is established, which systematically considers the toughening effect of the in-plane normal stress and the out-of-plane shear stress in the bridging zone. Finally, the toughening mechanism is investigated. The results demonstrate that the initiation fracture toughness predominantly arises from the enhancement of the intrinsic matrix fracture toughness due to the material anisotropy and heterogeneity. The ascending crack resistance curve is principally associated with the in-plane closing normal stress within the bridging zone. The periodic micro-fluctuations observed in the crack propagation resistance curve are primarily attributed to the out-of-plane shear forces present in the bridging zone. Increasing the fiber slenderness ratio and toughening the interfacial matrix can significantly improve the toughness. These results can not only reveal the toughening mechanism of the Bouligand structure but also provide guidelines for the design of high-performance composites.

The alternative text for this image may have been generated using AI.

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仿生Bouligand结构中裂缝桥接的增韧机制

受生物启发的Bouligand结构是一种分层和非均匀的结构，已经在龙虾的板层骨和外骨骼中观察到。它具有优异的抗损伤性能。然而，这种结构的增韧机制尚不清楚。本文提出了一个多尺度断裂模型来揭示裂纹桥接的增韧机理。首先，基于微观结构参数推导了其各向异性；然后，系统地考虑了桥接区面内法向应力和面外剪应力的增韧作用，建立了桥接模型；最后，对增韧机理进行了研究。结果表明，材料的各向异性和非均质性提高了基体的本征断裂韧性，从而提高了材料的起裂韧性。上升的抗裂曲线主要与桥接区内的面内闭合法向应力有关。在裂纹扩展阻力曲线上观察到的周期性微波动主要归因于桥接区存在的面外剪切力。提高纤维长细比和界面基体增韧可以显著提高纤维的韧性。这些结果不仅可以揭示布利甘组织的增韧机理，而且可以为高性能复合材料的设计提供指导。此图像的替代文本可能是使用AI生成的。

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

Acta Mechanica Sinica 物理-工程：机械

CiteScore

5.60

自引率

20.00%

发文量

1807

审稿时长

4 months

期刊介绍： Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences. Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences. In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest. Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics