Mechanics of Tunable Adhesion With Surface Wrinkles
Mechanics of Tunable Adhesion With Surface Wrinkles
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具有表面皱纹的可调粘合力的力学
DOI：
10.1115/1.4062699
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Zhang, Teng
中科院分区：
文献类型：
--
作者：
Zhang, Teng
表面皱纹已经成为开发具有动态可调附着力的智能胶粘剂的一条很有前途的途径，在软机器人和医疗器械等不同领域得到了应用。尽管有大量的研究和成果，但由于表面粗糙的表面拓扑结构和材料内部的预应力，对带有表面皱纹的可调粘着进行建模和模拟仍然是具有挑战性的。缺乏对机械原理的了解阻碍了这些智能粘合剂的合理设计。在这里，我们在分子动力学的框架下，将固体非线性变形的格子模型和非局域相互作用势结合起来，以探讨表面皱纹对粘着行为的影响。我们通过比较Neo-Hookean双层膜中的褶皱与基准结果，并再现圆柱形附着力的解析解来验证所提出的模型。然后，我们系统地研究了不同压缩应变和不同粘着能下皱纹表面的拉拔力。我们的结果揭示了粘着诱导接触和皱纹引起的粗糙度在增强或削弱附着力方面的竞争效应。这样的理解为定制材料和几何图形以及为不同应用加载起皱表面提供了指导。
Surface wrinkles have emerged as a promising avenue for the development of smart adhesives with dynamically tunable adhesion, finding applications in diverse fields, such as soft robots and medical devices. Despite intensive studies and great achievements, it is still challenging to model and simulate the tunable adhesion with surface wrinkles due to roughened surface topologies and pre-stress inside the materials. The lack of a mechanistic understanding hinders the rational design of these smart adhesives. Here, we integrate a lattice model for nonlinear deformations of solids and nonlocal interaction potentials for adhesion in the framework of molecular dynamics to explore the roles of surface wrinkles on adhesion behaviors. We validate the proposed model by comparing wrinkles in a neo-Hookean bilayer with benchmarked results and reproducing the analytical solution for cylindrical adhesion. We then systematically study the pull-off force of the wrinkled surface with varied compressive strains and adhesion energies. Our results reveal the competing effect between the adhesion-induced contact and the roughness due to wrinkles on enhancing or weakening the adhesion. Such understanding provides guidance for tailoring material and geometry as well as loading wrinkled surfaces for different applications.