The paper presents a mechanical model for describing the phenomenon of mixed-mode buckling-driven decohesion of a thin superficial layer from an underlying substrate loaded in compression. The superficial layer is schematised as a film partly bonded to the substrate by means of an elastic interface, in turn, represented by a continuous distribution of linear elastic springs placed both normally and tangentially to the interface plane. The nonlinear equilibrium problem is solved explicitly, so that the buckling stress is determined together with the complete structural response in the pre- and post-critical phases. In particular, the normal and tangential interfacial stresses are determined, from which the mode-I and mode-II components of the strain energy release rate and the mode-mixity angle are derived. Finally, a mixed-mode crack-growth criterion is applied and different types of possible crack growth predicted by the model are discussed.

An interface model for mixed-mode, buckling-driven decohesion of superficial layers

Bennati, S.;Valvo, P. S.
2006-01-01

Abstract

The paper presents a mechanical model for describing the phenomenon of mixed-mode buckling-driven decohesion of a thin superficial layer from an underlying substrate loaded in compression. The superficial layer is schematised as a film partly bonded to the substrate by means of an elastic interface, in turn, represented by a continuous distribution of linear elastic springs placed both normally and tangentially to the interface plane. The nonlinear equilibrium problem is solved explicitly, so that the buckling stress is determined together with the complete structural response in the pre- and post-critical phases. In particular, the normal and tangential interfacial stresses are determined, from which the mode-I and mode-II components of the strain energy release rate and the mode-mixity angle are derived. Finally, a mixed-mode crack-growth criterion is applied and different types of possible crack growth predicted by the model are discussed.
2006
978-1-4020-4971-2
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/908246
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