Abstract
This paper deals with crack growth simulation in brittle coating/substrate structures under three point bending. For this purpose, a discrete element method (DEM) code is prepared by the authors and is used as a numerical tool with great ability to capture the damages at micro scale. Coating and substrate were considered as isotropic materials. Bilinear cohesive contact model was implemented as bonds between coating and substrate constituent particles. The influence of fracture energy of coating and substrate and coating thickness on the failure of coating/substrate structure is investigated. The results showed that, when the fracture energy in coating and substrate are in the same range, cracks created in the coating were developed to the substrate. But, by increasing the fracture energy in the substrate, interfacial delamination was observed as the failure mode in the structure.
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