Achieving enhanced adhesion through optimal stress distributions
Achieving enhanced adhesion through optimal stress distributions
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DOI：
10.1016/j.jmps.2021.104610
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发表时间：
2021-08
影响因子：
5.3
通讯作者：
Aoyi Luo;K. Turner
中科院分区：
文献类型：
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作者：
Aoyi Luo;K. Turner
依赖于表面力介导的粘附（例如货车范德华力）的干粘合剂在从机器人到制造的应用中是重要的。当应力均匀分布在整个接触区域上时，实现了接触的最大理论粘附强度，因为在这种情况下，实现了界面处所有键的全部电势。大多数干粘合剂结构由形成接触的尖端层和将载荷从远场传递到该尖端结构的支撑结构组成。在这里，我们确定的位移分布，必须施加在尖端层，以产生最佳的界面应力分布。我们实现这一点，通过一个线性的，封闭形式的优化框架，使用从有限元分析获得的数据为几个基本情况。结果发现，可以通过在尖端层上施加最佳位移来最大化粘附，所述最佳位移包括中心处的均匀张力、中心与边缘之间的峰值张力以及边缘附近的压缩。然后对蘑菇形、复合材料和新型分段复合材料结构的尖端层施加的位移进行分析，并与最优情况进行比较，以指导干胶的设计。
Dry adhesives that rely on surface force mediated adhesion, such as van der Waals forces, are important in applications ranging from robotics to manufacturing. The maximum theoretical adhesion strength of a contact is achieved when the stress is uniformly distributed over the entire contact area as the full potential of all the bonds at the interface is realized in this scenario. Most dry adhesive structures are composed of a tip layer that forms contact and a support structure that transfers load from the far field to this tip structure. Here, we determine the displacement distribution that must be applied on the tip layer to generate an optimum interfacial stress distribution. We realize this through a linear, closed-form optimization framework that uses data obtained from finite element analysis for a few basis cases. It was found that adhesion can be maximized by applying an optimum displacement on the tip layer that consists of uniform tension in the center, a peak tension between the center and the edge, and compression near the edge. The displacement applied on the tip layer of a mushroom-shaped, composite, and novel segmented composite structures are then analyzed and compared with the optimal case to guide the design of dry adhesives.