Pre-tension generates strongly reversible adhesion of a spatula pad on substrate
Pre-tension generates strongly reversible adhesion of a spatula pad on substrate
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DOI：
10.1098/rsif.2008.0322
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发表时间：
2009-06-06
影响因子：
3.9
通讯作者：
Gao, Huajian
中科院分区：
文献类型：
--
作者：
Chen, Bin;Wu, Peidong;Gao, Huajian
受壁虎和昆虫可逆粘附机理研究的启发，我们研究了预张力对弹性胶带粘附在基底上的取向依赖性粘附强度的影响。我们的分析表明，预张力可以显着增加剥离力在小剥离角，而降低它在大剥离角，导致强烈的可逆粘附。更有趣的是，我们发现，存在一个临界值的预张力超过剥离力骤降到零，在力无关的临界剥离角。我们进一步表明，这种力独立的分离在临界角所需的预张力的水平，可以通过简单地拖动一个抹刀垫沿着基板在足够低的角度。这些结果提供了一个可行的解释相关的实验观察壁虎粘附，并建议可能的策略，设计强可逆胶粘剂通过预张力。
Motivated by recent studies oil reversible adhesion mechanisms of geckos and insects, we investigate the effect of pre-tension on the orientation-dependent adhesion strength of an elastic tape adhering on a substrate. Our analysis shows that the pre-tension can significantly increase the peel-off force at small peeling angles while decreasing it at large peeling angles, leading to a strongly reversible adhesion. More interestingly, we find that there exists a critical value of pre-tension beyond which the peel-off force plunges to zero at a force-independent critical peeling angle. We further show that the level of pre-tension required for such force-independent detachment at a critical angle can be induced by simply dragging a spatula pad along a substrate at sufficiently low angles. These results provide a feasible explanation of relevant experimental observations on gecko adhesion and suggest possible strategies to design strongly reversible adhesives via pre-tension.