Confinement-induced instability and adhesive failure between dissimilar thin elastic films |
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Authors: | J Y Chung K H Kim M K Chaudhury J Sarkar A Sharma |
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Institution: | (1) Department of Chemical Engineering, Lehigh University, 18015 Bethlehem, PA, USA;(2) Department of Chemical Engineering, Indian Institute of Technology, Kanpur, India |
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Abstract: | When two thin soft elastomeric films are separated from each other, an elastic instability develops at the interface. Although
similar instability develops for the case of a soft film separating from a rigid adherent, there are important differences
in the two cases. For the single-film case, the wavelength of instability is independent of any material properties of the
system, and it scales only with thickness of the film. For the two-film case, a co-operative instability mode develops, which
is a non-linear function of the thicknesses and the elastic moduli of both films. We investigate the development of such instability
by energy minimization procedures. Understanding the nature of this instability is important, as it affects the adhesive compliance
of the system and thus the energy release rate in the debonding of soft interfaces. |
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Keywords: | 68 35 -p Solid surfaces and solid-solid interfaces: Structure and energetics 68 35 Gy Mechanical properties surface strains 68 35 Np Adhesion |
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