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Suction Effects of Craters Underwater

Abstract

Octopus-inspired cratered surfaces recently emerge as a new class of reusable physical adhesives. Preload-dependent adhesion and enhanced adhesion underwater distinct them from the well-studied gecko-inspired pillared surfaces. Despite growing experimental evidence, modeling framework and mechanistic understandings for cratered surfaces are still very limited. We recently developed a framework to evaluate suction forces produced by isolated craters in air. In this paper, we focus on underwater craters. The suction force-preload relation predicted by this framework has been validated by experiments carried out with incompressible fluid under small and moderate preload. Our model breaks down under large preload due to multiple possible reasons including liquid vaporization. Direct comparison between liquid and air-filled craters has been carried out and the dependence on the depth of water has been revealed. We find that the suction forces generated by underwater craters scale with specimen modulus but exhibit non-monotonic dependence on the aspect ratio of the craters.

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Publication details

The article was received on 04 Aug 2018, accepted on 10 Oct 2018 and first published on 11 Oct 2018


Article type: Paper
DOI: 10.1039/C8SM01601A
Citation: Soft Matter, 2018, Accepted Manuscript
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    Suction Effects of Craters Underwater

    S. Qiao, L. Wang, K. Ha and N. Lu, Soft Matter, 2018, Accepted Manuscript , DOI: 10.1039/C8SM01601A

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