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Numerical study of adhesion enhancement by composite fibrils with soft tip layers

  • Bio-inspired fibrillar surfaces with reversible adhesion to stiff substrates have been thoroughly investigated over the last decade. In this paper we propose a novel composite fibril consisting of a soft tip layer and stiffer stalk with differently shaped interfaces (flat vs. curved) between them. A tensile stress is applied remotely on the free end of the fibril whose other end adheres to a rigid substrate. The stress distributions and the resulting adhesion of such structures were numerically investigated under plane strain ( 2 D ) and axisymmetric ( 3 D ) conditions. The stress intensities were evaluated for different combinations of layer thickness and Young’s moduli. The adhesion strength values were found to increase for thinner layers and larger modulus ratio; these trends are also reflected in selected experimental results. The results of this paper provide a new strategy for optimizing adhesion strength of fibrillar surfaces.

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Document Type:Article
Author:Ramgopal Balijepalli, Sarah FischerORCiD, René HenselORCiD, Robert M. McMeekingORCiD, Eduard ArztORCiD
Parent Title (English):Journal of the Mechanics and Physics of Solids
First Page:357
Last Page:378
Year of first Publication:2017
Date of final exam:2016/12/01
Release Date:2022/11/18
Impact:03.566 (2017)
Groups:Funktionelle Mikrostrukturen
Open Access:Open Access
Signature:INM 2017/005
Licence (German):License LogoCreative Commons - CC BY-NC-ND - Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International