How soft substrates affect the buckling delamination of thin films through crack front sink-in

R. Boijoux (1) , G. Parry (1) , J.-Y. Faou (2) , C. Coupeau (3)

1 SIMaP - Science et Ingénierie des Matériaux et Procédés
2 SGR - Saint-Gobain Recherche
3 PPrime [Poitiers] - Institut Pprime [UPR 3346]

As the development of stretchable devices advances, engineering components with rigid films on soft substrates are becoming more numerous. We propose to analyse the buckle delamination of a film on a soft substrate, under a biaxial compressive stress state. This problem has already been investigated by an Euler column buckling analysis. In this paper, experiments on soft substrates are presented, which demonstrate that the buckle shape is, in some cases, better approximated by a “Mexican hat” shape. A model using a non-linear plate bonded to an elastic medium by a cohesive interaction is used to describe the delamination process. It is demonstrated that the “Mexican hat” shape modifies the crack propagation behavior for a soft substrate.

Domaines: Mécanique des matériaux [physics.class-ph]

R. Boijoux, G. Parry, J.-Y. Faou, C. Coupeau. How soft substrates affect the buckling delamination of thin films through crack front sink-in. Applied Physics Letters, 2017, 110 (14), ⟨10.1063/1.4979614⟩. ⟨hal-01685184⟩