Adhesive contact between a rippled elastic surface and a rigid spherical indenter: from partial to full contact

Congrui Jin; Krishnacharya Khare; Shilpi Vajpayee; Shu Yang; Anand Jagota; Chung-Yuen Hui

doi:10.1039/C1SM06367G

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Soft Matter

Issue 22, 2011

Where physics meets chemistry meets biology for fundamental soft matter research.

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Adhesive contact between a rippled elastic surface and a rigid spherical indenter: from partial to full contact

Congrui Jin,^a Krishnacharya Khare,^b Shilpi Vajpayee,^c Shu Yang,*^b Anand Jagota*^c and Chung-Yuen Hui*^a

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Field of Theoretical and Applied Mechanics, Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, USA
E-mail: ch45@cornell.edu ;
Fax: +1-(607)-255-2011 ;
Tel: +1-(607)-255-3718

Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, USA
E-mail: shuyang@seas.upenn.edu ;
Fax: +1-(215)-573-2128 ;
Tel: +1-(215)-898-9645

Department of Chemical Engineering, Lehigh University, Bethlehem, USA
E-mail: anj6@lehigh.edu ;
Fax: +1-(610)-758-5057 ;
Tel: +1-(610)-758-4396

Soft Matter, 2011,7, 10728-10736

DOI: 10.1039/C1SM06367G
Received 19 Jul 2011, Accepted 26 Aug 2011
First published online 05 Oct 2011

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Surface mechanical properties such as adhesion and friction can be controlled by creating a rippled surface. In this paper, we present numerical and experimental studies on adhesive contact between a rippled surface and a rigid spherical indenter. In our numerical method, surface interaction is modeled using Lennard-Jones potential with Derjaguin's approximation. We also carry out a systematic experimental investigation by measuring the adhesion between a spherical glass indenter and rippled polydimethylsiloxane (PDMS) strips with varying amplitudes. With increasing ripple amplitude, our experimental results show a monotonic decrease in pull-off force, transition from full to partial contact, and pressure-sensitive adhesion. Our numerical simulation captures all the salient features of the experimental results remarkably well.

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Congrui Jin
Krishnacharya Khare
Shilpi Vajpayee
Shu Yang
Anand Jagota
Chung-Yuen Hui

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