Analysis of Mixed-mode Adhesion Failure of Polyurethane Bio-inspired Mushroom-shaped Microfibers
LU Wenyu1, NING Zhihua1,*, 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
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.
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
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