Journal
JOURNAL OF THE ROYAL SOCIETY INTERFACE
Volume 6, Issue 35, Pages 529-537Publisher
ROYAL SOC
DOI: 10.1098/rsif.2008.0322
Keywords
gecko adhesion; frictional adhesion; Kendall's elastic tape model; adhesion of a spatula pad; pre-tension
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Institute of High Performance Computing in Singapore
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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.
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