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Effect of Geometry on the Adhesive Behavior of Bio-inspired Fibrils

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Bio-inspired Studies on Adhesion of a Thin Film on a Rigid Substrate

Part of the book series: Springer Theses ((Springer Theses))

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Abstract

Inspired by the special climbing ability of geckos and insects, the effects of geometries, including the end-shape and size, on the adhesion features of bio-inspired fibrils, are investigated. It is found that the adhesion force of a mushroom-shaped fibril in perfect contact with a rigid substrate decreases with the increase of peeling angle, but it will increase with an increasing flange thickness at a determined peeling angle. With the same contact length, the mushroom-shaped fibril can achieve much larger adhesion force than the cylindrical or the spatular one due to a larger effective region of the cohesive zone. The effect of the shaft width of the mushroomed-shaped fibril on the adhesion force with and without interfacial defects is also considered, and the results are further compared qualitatively with the experimental ones. A critical contact length for the mushroom-shaped fibril is further found, above which the adhesion force attains the maximum. For a multi-fibril structure, the phenomenon of almost equal load sharing for each fibril is verified numerically, which is consistent with the existing experimental observation.

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Authors and Affiliations

  1. Institute of Mechanics, Chinese Academy of Sciences, Beijing, China

    Zhilong Peng

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  1. Zhilong Peng
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Correspondence to Zhilong Peng .

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Peng, Z. (2015). Effect of Geometry on the Adhesive Behavior of Bio-inspired Fibrils. In: Bio-inspired Studies on Adhesion of a Thin Film on a Rigid Substrate. Springer Theses. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-46955-2_7

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