Adhesion for Coatings

E. Breton (1) , Marie-Christine Baietto (2)

1 Service de Biophysique et Médecine Nucléaire
2 LMSt - Laboratoire de Mécanique des Structures

Spall detachment in coatings is modelled as a cracked coated medium submitted to contact loading. Few models analyse the role of interfacial cracks between coating and substrate. The existing models are limited in use, due to assumptions on number and location of displacement zones (stick, slip, open) along crack faces. Further only ones crack is analysed at a time. A spall detachment is analysed as a combination of an interfacial crack that propagates at the interface and a surface breaking crack that propagates normally to the interface. These two cracks are analysed simultaneously. The energy release rate G is determined at crack tips. The method employed is half-analytical and half-numerical. Results show that, for the case studied, crack interaction favours crack propagation. The following spall detachment process is proposed: the surface breaking crack propagates down to the interface and the interfacial crack propagates at the interface in a direction opposite to that of the load displacement.

Domaines: Sciences de l'ingénieur [physics]

E. Breton, Marie-Christine Baietto. Adhesion for Coatings. Science direct, 1992, 21 (C), pp.41-47. ⟨10.1016/S0167-8922(08)70507-8⟩. ⟨hal-01951914⟩