Achieving enhanced and tunable adhesion via composite posts
Achieving enhanced and tunable adhesion via composite posts
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DOI：
10.1063/1.4921423
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发表时间：
2015-05
影响因子：
4
通讯作者：
Helen K Minsky;K. Turner
中科院分区：
文献类型：
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作者：
Helen K Minsky;K. Turner
具有增强和可调粘附力的表面具有多种应用，包括半导体元件的微转移印刷、制造中的材料处理以及攀爬机器人上的抓取表面。传统上，实现可调粘附的方案依赖于制造具有复杂几何形状的柱或纤维的阵列，诸如由较宽帽端接的成角度的柱。在这里，我们描述了一种替代后结构与复杂的几何形状，通过使用复合后，包括一个刚性的核心和一个兼容的外壳。由刚性芯和顺应性外壳组成的桩在正常载荷下具有增强的粘附力，并且可以通过施加剪切来减少拔出。复合材料桩的粘附力学在这里通过结合有限元模拟和实验测量单个毫米级的职位。
Surfaces with enhanced and tunable adhesion have a variety of applications, including microtransfer printing of semiconductor elements, material handling in manufacturing, and gripping surfaces on climbing robots. Traditionally, schemes to achieve tunable adhesion have relied on fabricating arrays of posts or fibers with complex geometries, such as angled posts terminated by wider caps. Here, we describe an alternative to post structures with complex geometries through the use of composite posts that consist of a stiff core and a compliant shell. Posts consisting of a stiff core and compliant shell have enhanced adhesion under normal loading, and the pull-off can be reduced via the application of shear. The adhesion mechanics of composite posts are demonstrated here through a combination of finite element simulations and experimental measurements on individual millimeter-scale posts.