Crack-driving force and toughening mechanism in crustacean-inspired helicoidal structures

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:208

Article

Yang, Fan¹  Xie, Weihua¹  Meng, Songhe¹ 

[1] Harbin Inst Technol, Sci & Technol Adv Composites Special Environm Lab, 2 Yikuang St, Harbin 150080, Peoples R China

关键词: Configurational forces;    Fracture performance;    Toughening mechanism;    Crack kinking;    Crustacean-inspired composite laminates;   

DOI  :  10.1016/j.ijsolstr.2020.10.016

来源: Elsevier

【 摘 要 】

The helicoidal fibril structures are identified in a variety of naturally occurring species, like the crustaceans. This paper describes a theoretical modelling approach to study the fracture properties and toughening mechanism of the crustaceans-inspired helicoidal structures. First, due to the low fracture resistance of the commonly used carbon fibre reinforced polymers (CFRPs) cross-ply laminates, this research explains the feasibility for improving the fracture toughness of CFRPs based on the bionic design concept. Then, the biomimetic architected CFRPs mimicking the exoskeleton of crustacean structures are analysed for fracture performance. The configurational force theory is utilised to estimate the crack-driving force in crustacean-inspired structures, and a theoretical model is also developed to characterise the strain energy release rates in the bio-inspired structures based on crack kinking/twisting observations. Finally, simulations on the proposed computational model of the crack-driving force are conducted to predict the fracture toughness of the bio-inspired specimens under Mode I loading, and the toughening mechanism is further explored. The results show that elastic modulus and orientations of helix fibres played important roles in the fracture performance of helicoidal fibre structures. This work deepens the understanding of the structure-performance relationship of the helicoidal composites in bionic design, and it inspires more applications that require CFRP laminates with enhanced toughness. (C) 2020 Published by Elsevier Ltd.

【 授权许可】

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