Suction-Controlled Detachment of Mushroom-Shaped Adhesive Structures
Suction-Controlled Detachment of Mushroom-Shaped Adhesive Structures
复制标题
蘑菇状粘合结构的吸力控制分离
DOI：
10.1115/1.4049392
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
McMeeking, Robert M.
中科院分区：
文献类型：
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作者：
Areyano, Marcela;Booth, Jamie A.;Brouwer, Dane;Gockowski, Luke F.;Valentine, Megan T.;McMeeking, Robert M.
实验结果表明，吸力对蘑菇头黏附结构的附着强度有一定的影响，但控制这种影响的系统参数尚未确定。引入了一种基于断裂力学的模型，以确定存在困气时界面处缺陷扩展的临界应力。这些结果与毫米级弹性结构的实验研究结果进行了比较。这些结构被发现表现出更大的强度增加，由于吸力比在文献中是典型的，因为他们有一个大的尖端直径相对于茎。该模型还提供了洞见在蘑菇形结构的设计空间中预期行为的差异。例如，该模型揭示了吸力的贡献是长度尺度相关的。对于更大的结构，由于体积变化增加，从而在缺陷内部获得更低的压力，因此它得到了增强。如果使尖端相对于茎更宽，则表明这种结垢效应不那么明显。在缺陷远离茎部的极限处也提供了一个渐近结果，表明临界应力比文献中经常用于估计吸力影响的结果低1/2。这种差异的产生是由于后者只考虑了缺陷内部的远程应力和压力的平衡，而忽略了缺陷外部压缩牵引力的影响。
Experimental evidence suggests that suction may play a role in the attachment strength of mushroom-tipped adhesive structures, but the system parameters which control this effect are not well established. A fracture mechanics-based model is introduced to determine the critical stress for defect propagation at the interface in the presence of trapped air. These results are compared with an experimental investigation of millimeter-scale elastomeric structures. These structures are found to exhibit a greater increase in strength due to suction than is typical in the literature, as they have a large tip diameter relative to the stalk. The model additionally provides insight into differences in expected behavior across the design space of mushroom-shaped structures. For example, the model reveals that the suction contribution is length-scale dependent. It is enhanced for larger structures due to increased volume change, and thus the attainment of lower pressures, inside of the defect. This scaling effect is shown to be less pronounced if the tip is made wider relative to the stalk. An asymptotic result is also provided in the limit that the defect is far outside of the stalk, showing that the critical stress is lower by a factor of 1/2 than the result often used in the literature to estimate the effect of suction. This discrepancy arises as the latter considers only the balance of remote stress and pressure inside the defect and neglects the influence of compressive tractions outside of the defect.
DOI：
10.1016/j.ijsolstr.2016.02.018
发表时间：
2016-05-15
影响因子：
3.6
作者：
Balijepalli, R. G.;Begley, M. R.;Arzt, E.
通讯作者：
Arzt, E.
影响因子：
9.5
作者：
Fischer SC;Arzt E;Hensel R
通讯作者：
Hensel R
Tada, H.：“感觉形态和精神负荷对眨眼率的影响。”
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