聚氨酯蘑菇状仿生微纤维的混合黏附破坏分析

doi:10.11896/cldb.22120085

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Abstract Geckos have been extensively studied in the field of bionics due to their superior climbing ability. The adhesion mechanism between the gecko biomimetic microfibers and the vertical surface was thoroughly investigated in order to design the vertical climbing function of the gecko bionic microstructure. A bilinear cohesion model was used to analyze the interfacial adhesion behavior of polyurethane(PU) mushroom-shaped biomi-metic microfibers and rigid substrates. To understand the failure mechanism during the process of gecko climbing, the crawling actions of gecko feet such as attachment, sliding and separation, were simulated by compression-shear combined loading, pure shear loading and tension-shear combined loading, respectively. The results show that, normal-tangential mixed mode adhesion failure occurs when subject to pure shear loading or tension-shear combined loading. However, the occurrence of tangential debonding or mixed-mode adhesion failure depends on the magnitude of compressive load. The normal loading can regulate the tangential adhesion bearing capacity by changing the contact area between the microfibers and the substrates. The adhesion bearing capacity of the interface under oblique loading is related to the loading inclination angle. For the selected polyurethane mushroom-like biomimetic microfibers, the tangential adhesion bearing capacity increases with the increase of oblique pressure inclination angle for an oblique pressure inclination angle less than 52°. The optimal peeling angle is 17°, which allows the interface to be debonded with the least amount of tension.

Key words： gecko bionic adhesion polyurethane mushroom-shaped microfibers adhesion mechanism mixed-mode adhesion failure

Published: 25 May 2024 Online: 2024-05-28

CLC number:

Q692

Fund:Key Specialty for Ordinary Universities in Guangdong Province(2020ZDZX2044).

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	Articles by authors
	LU Wenyu
	NING Zhihua
	PENG Tao
	CHEN Haiyan
	JIN Yan

Cite this article:

LU Wenyu,NING Zhihua,PENG Tao, et al. Analysis of Mixed-mode Adhesion Failure of Polyurethane Bio-inspired Mushroom-shaped Microfibers[J]. Materials Reports, 2024, 38(10): 22120085-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22120085 OR http://www.mater-rep.com/EN/Y2024/V38/I10/22120085

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