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

材料导报

2024, Vol. 38

Issue (10): 22120085-7 https://doi.org/10.11896/cldb.22120085

高分子与聚合物基复合材料

聚氨酯蘑菇状仿生微纤维的混合黏附破坏分析

鲁雯雨¹, 宁志华^1,*, 彭焘¹, 陈海燕¹, 金延²

1 暨南大学力学与建筑工程学院,“重大工程灾害与控制”教育部重点实验室,广州 510632
2 沈阳市建设工程质量监督站,沈阳 110071

Analysis of Mixed-mode Adhesion Failure of Polyurethane Bio-inspired Mushroom-shaped Microfibers

LU Wenyu¹, NING Zhihua^1,*, PENG Tao¹, CHEN Haiyan¹, JIN Yan²

1 MOE Key Laboratory of Disaster Forecast and Control in Engineering, School of Mechanics and Construction Engineering, Jinan University, Guangzhou 510632, China
2 Shenyang Construction Engineering Quality Supervision Station, Shenyang 110071, China

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摘要在仿生学领域壁虎因具有优越的攀爬能力而被广泛研究。为对壁虎仿生微结构的垂直攀爬功能进行设计,本工作对壁虎仿生微纤维与垂直表面之间的黏附机制进行了深入研究。采用双线性内聚力模型对聚氨酯(PU)蘑菇状仿生微纤维与刚性基体之间的界面黏附行为进行研究。运用压缩+剪切、剪切加载、拉伸+剪切分别模拟壁虎足部的附着、滑移及分离等爬行动作,探讨壁虎爬行过程中的黏附破坏机理。结果表明,在剪切加载、拉伸+剪切混合加载下,界面均发生法向和切向的混合黏附破坏;在压缩+剪切混合加载下,界面发生切向脱黏或混合黏附破坏取决于压缩载荷的大小。法向载荷通过改变微纤维与基体的接触面积来实现对切向黏附承载力的调控。斜向加载下界面的黏附承载力与载荷倾角有关,对于所选用的聚氨酯蘑菇状仿生微纤维,当斜向压力的倾角小于52°时,界面的切向黏附承载力随着斜向压力倾角的增大而增大;最优的斜向拉力方向为17°,沿该方向可用最小的拉力实现界面的脱黏。

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关键词: 壁虎仿生黏附聚氨酯(PU)蘑菇状微纤维黏附机制混合黏附破坏

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

出版日期: 2024-05-25 发布日期: 2024-05-28

ZTFLH:

Q692

基金资助: 广东省普通高校重点专项(2020ZDZX2044)

通讯作者: *宁志华,暨南大学力学与建筑工程学院副教授、硕士研究生导师。1999年湖南大学工程力学专业本科毕业,2002年固体力学专业硕士毕业后到暨南大学工作至今,2011年暨南大学工程力学专业博士毕业。主要从事复合材料损伤分析、压力容器疲劳与断裂及仿生力学方面的研究工作。发表论文30多篇,包括Composites Part B、International Journal of Pressure Vessels and Piping、ASME Journal of Pressure vessel Technology和Mechanics of Time-Dependent Material等。tningzhihua@jnu.edu.cn

作者简介: 鲁雯雨,2019年6月获得中北大学本科学位,现为暨南大学力学与建筑学院硕士研究生,在宁志华教授的指导下进行研究。目前主要从事复合材料损伤分析、断裂力学以及仿生力学方面的研究工作。

引用本文:

鲁雯雨, 宁志华, 彭焘, 陈海燕, 金延. 聚氨酯蘑菇状仿生微纤维的混合黏附破坏分析[J]. 材料导报, 2024, 38(10): 22120085-7.
LU Wenyu, NING Zhihua, PENG Tao, CHEN Haiyan, JIN Yan. Analysis of Mixed-mode Adhesion Failure of Polyurethane Bio-inspired Mushroom-shaped Microfibers. Materials Reports, 2024, 38(10): 22120085-7.

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http://www.mater-rep.com/CN/10.11896/cldb.22120085 或 http://www.mater-rep.com/CN/Y2024/V38/I10/22120085

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