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Frictional Effects in the Buckling Delamination of a Compressed Thin Film and Implications for Interfacial Fracture

Published online by Cambridge University Press:  22 February 2011

R. G. Stringfellow  and
L. B. Freund
R. G. Stringfellow
Affiliation:
Division of Engineering, Brown University, Providence, RI 02192
L. B. Freund
Affiliation:
Division of Engineering, Brown University, Providence, RI 02192
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Abstract

As a film in residual compression delaminates from a substrate, the post-buckling response of the film tends to drive it into the substrate in the region directly behind the delamination front. We consider the process of frictional interaction between the film and the substrate during the delamination process in order to assess the effect of Coulomb friction on the energy release rate, G, driving the delamination. For the case in which the film and the substrate have identical elastic properties, we derive a singular integral equation to determine the relative sliding displacement of the opposing faces of the interface. Using an analytical model, we find that G decreases by about 35% when the coefficient of interfacial friction is equal to one. Using finite element methods, we then investigate the effects of compliance differences between the film and the substrate. We find that, when the film is more compliant than the substrate, frictional interaction is enhanced and the calculated energy release rate decreases substantially. We conclude that frictional effects can account for a significant portion of the energy dissipation during the delamination process, and thus can play an important role in the observed arrest of spreading delaminations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 239: Symposium D – Thin Films: Stresses and Mechanical Properties III , 1991 , 579
Copyright
Copyright © Materials Research Society 1992

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