1 Mechanical modelling of interfacial phase in coatings 2

Abstract: Interface between matrix/coating or coating/coating in fact represents a very complicate 6 thin interfacial layer. So interface model is necessary to avoid the difficulty on considering such a 7 complicate thin layer in analysis. Classic interface model and cohesive model have been widely used 8 in stress analysis of coating materials, though they cannot represent the effect of very thin interfacial 9 layer accurately. A complete interface model has been deduced from the equivalent constitutive of 10 interfacial layer in this paper. It is found that both classic interface model and cohesive model 11 sometimes cannot give correct analysis results, while the complete interface model can always give a 12 correct result. Moreover, the stress parallel to interface within the interfacial layer can also be 13 analyzed by the new model. Besides, this model can also be used to describe the equivalent properties 14 of interfacial layer, thereby, can provide a quantitative characterizing method for interfacial layer 15 itself. 16