Controllable load sharing for soft adhesive interfaces on three-dimensional surfaces
Controllable load sharing for soft adhesive interfaces on three-dimensional surfaces
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DOI：
10.1073/pnas.1620344114
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发表时间：
2017-05-30
影响因子：
11.1
通讯作者：
Sitti, Metin
中科院分区：
文献类型：
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作者：
Song, Sukho;Drotlef, Dirk-Michael;Sitti, Metin
为了粘附到三维（3D）表面或物体，目前的粘附系统受到3D表面适形性和高粘附强度之间的基本权衡的限制。这种限制来自于对柔软的、机械顺应性界面的需要，该界面能够顺应不平坦和不规则形状的表面，但显著降低了界面断裂强度。在这项工作中，我们克服了这种权衡与粘附为基础的软抓持系统，表现出增强的断裂强度，而不牺牲顺应性非平面三维表面。由壁虎启发的弹性体微纤维粘合剂膜支持的压力控制的可变形的夹具机构组成，建议的软夹持系统控制的粘接强度，通过改变其内部压力和利用界面等载荷分配的力学。软粘附系统可以使用高达纤维膜的最大粘附力的26%，这比没有负载分担的粘附膜高14倍。我们提出的负载分担方法提出了一种基于软粘附的抓取和转印系统的范例，该系统实现了类似于天然壁虎脚垫的面积缩放。
For adhering to three-dimensional (3D) surfaces or objects, current adhesion systems are limited by a fundamental trade-off between 3D surface conformability and high adhesion strength. This limitation arises from the need for a soft, mechanically compliant interface, which enables conformability to nonflat and irregularly shaped surfaces but significantly reduces the interfacial fracture strength. In this work, we overcome this trade-off with an adhesion-based soft-gripping system that exhibits enhanced fracture strength without sacrificing conformability to nonplanar 3D surfaces. Composed of a gecko-inspired elastomeric microfibrillar adhesive membrane supported by a pressure-controlled deformable gripper body, the proposed soft-gripping system controls the bonding strength by changing its internal pressure and exploiting the mechanics of interfacial equal load sharing. The soft adhesion system can use up to similar to 26% of the maximum adhesion of the fibrillar membrane, which is 14x higher than the adhering membrane without load sharing. Our proposed load-sharing method suggests a paradigm for soft adhesion-based gripping and transfer-printing systems that achieves area scaling similar to that of a natural gecko footpad.