Surface instability of confined elastic bilayers: Theory and simulations


Autoria(s): Tomar, Gaurav; Sharma, Ashutosh; Shenoy, Vijay B; Biswas, Gautam
Data(s)

01/07/2007

Resumo

The surface of a soft elastic film becomes unstable and forms a self-organized undulating pattern because of adhesive interactions when it comes in contact proximity with a rigid surface. For a single film, the pattern length scale lambda, which is governed by the minimization of the elastic stored energy, gives lambda similar to 3h, where h is the film thickness. Based on a linear stability analysis and simulations of adhesion and debonding, we consider the contact instability of an elastic bilayer, which provides greater flexibility in the morphological control of interfacial instability. Unlike the case of a single film, the morphology of the contact instability patterns, debonding distance, and debonding force in a bilayer can be controlled in a nonlinear way by varying the thicknesses and shear moduli of the films. Interestingly, the pattern wavelength in a bilayer can be greatly increased or decreased compared to a single film when the adhesive contact is formed by the stiffer or the softer of the two films, respectively. In particular, lambda as small as 0.5h can be obtained. This indicates a new strategy for pattern miniaturization in elastic contact lithography.

Formato

application/pdf

Identificador

http://eprints.iisc.ernet.in/27501/1/surface.pdf

Tomar, Gaurav and Sharma, Ashutosh and Shenoy, Vijay B and Biswas, Gautam (2007) Surface instability of confined elastic bilayers: Theory and simulations. In: Physical Review E - Statistical, Nonlinear and Soft Matter Physics, 76 (1). 011607- 011614.

Publicador

The American Physical Society

Relação

http://pre.aps.org/showrefs/PRE/v76/i1/e011607

http://eprints.iisc.ernet.in/27501/

Palavras-Chave #Materials Engineering (formerly Metallurgy)
Tipo

Journal Article

PeerReviewed