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The effect of shape on the adhesion of fibrillar surfaces.

Spuskanyuk, AV and McMeeking, RM and Deshpande, VS and Arzt, E (2008) The effect of shape on the adhesion of fibrillar surfaces. Acta Biomater, 4. pp. 1669-1676.

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Abstract

Experimental data have demonstrated that mushroom-shaped fibrils adhere much better to smooth substrates than punch-shaped fibrils. We present a model that suggests that detachment processes for such fibrils are controlled by defects in the contact area that are confined to its outer edge. Stress analysis of the adhered fibril, carried out for both punch and mushroom shapes with and without friction, suggests that defects near the edge of the adhesion area are much more damaging to the pull-off strength in the case of the punch than for the mushroom. The simulations show that the punch has a higher driving force for extension of small edge defects compared with the mushroom adhesion. The ratio of the pull-off force for the mushroom to that of the punch can be predicted from these simulations to be much greater than 20 in the friction-free case, similar to the experimental value. In the case of sticking friction, a ratio of 14 can be deduced. Our analysis also offers a possible explanation for the evolution of asymmetric mushroom shapes (spatulae) in the adhesion organ of geckos.

Item Type: Article
Uncontrolled Keywords: Adhesiveness Animals Biocompatible Materials Biomechanical Phenomena Biomimetics Cell Adhesion Elasticity Lizards Mechanics Microscopy, Electron, Scanning Models, Biological Stress, Mechanical Surface Properties Tensile Strength
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:20
Last Modified: 28 Jul 2014 01:07
DOI: 10.1016/j.actbio.2008.05.026

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