Ni Zifeng

Effect of the number of layers on the bond strength for multi-layer brittle coating-substrate system

Finite element method (FEM) was used to investigate the effect of the number of layers on the bond strength for the brittle coating/substrate materials at contact load condition, which has not been addressed previously. The maximum shear stress was used to act as the criterion of the bonded strength. This paper discussed the relationship between the number of coating layers and the maximum shear stress of the layer/substrate interface. Firstly, the results of the FEM and the Hertz analytical method were compared to verify the accuracy of the FEM model. It was found that with the increase in the number of coating layers, the position of the suddenly changed stress along the z axis is transformed from the interface to the external surface of the coating. Finally, the increase in the number of layers contributes to the decrement of the stress along the x axis.