Dynamically Tunable Dry Adhesion via Subsurface Stiffness Modulation
Dynamically Tunable Dry Adhesion via Subsurface Stiffness Modulation
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DOI：
10.1002/admi.201800321
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发表时间：
2018-09-21
影响因子：
5.4
通讯作者：
Shan, Wanliang
中科院分区：
文献类型：
--
作者：
Tatari, Milad;Nasab, Amir Mohammadi;Shan, Wanliang
可调节的干粘附力具有广泛的应用，包括转移印刷、攀爬机器人和自动化制造过程中的抓取。在这里，介绍并演示了一种通过调节地下机械元件的刚度来实现动态可调干附着力的新颖概念。制造了一种复合柱结构，由弹性体外壳和芯组成，其刚度可通过施加电压进行调节。在非活化状态下，芯是刚性的并且复合材料柱和接触表面之间的有效粘合强度高。通过施加电压激活芯会降低芯的刚度，从而导致界面处分层的应力分布和驱动力发生变化，从而降低有效粘合强度。对具有一定尺寸范围的复合材料柱的粘附力进行了表征，并且显示芯的激活可将粘附力降低多达 6 倍。实验观察到的粘附力降低主要是由于芯刚度的变化。然而，核的激活也会导致界面加热，这在粘附力变化中起着次要作用。
Tunable dry adhesion has a range of applications, including transfer printing, climbing robots, and gripping in automated manufacturing processes. Here, a novel concept to achieve dynamically tunable dry adhesion via modulation of the stiffness of subsurface mechanical elements is introduced and demonstrated. A composite post structure, consisting of an elastomer shell and a core with a stiffness that can be tuned via application of electrical voltage, is fabricated. In the nonactivated state, the core is stiff and the effective adhesion strength between the composite post and contact surface is high. Activation of the core via application of electrical voltage reduces the stiffness of the core, resulting in a change in the stress distribution and driving force for delamination at the interface and, thus a reduction in the effective adhesion strength. The adhesion of composite posts with a range of dimensions is characterized and activation of the core is shown to reduce the adhesion by as much as a factor of 6. The experimentally observed reduction in adhesion is primarily due to the change in stiffness of the core. However, the activation of the core also results in heating of the interface and this plays a secondary role in the adhesion change.