Maximum interface shear stress in the cermet cladding part under steady thermal load

Taking the cermet cladding plate part as the study object, according to the thermal elastic mechanics, with Rayleigh-Ritz method, the thermal stress field in the part under steady thermal load is solved. And the theoretical model of the maximum interface shear stress in the part is built. Based on the theoretical model, an example research on the maximum interface shear stress with the finite element method (FEM) is made. The results show that, under the steady thermal load, the maximum interface shear stress in the cladding part increases with the growth of the temperature, the clad thickness ratio and the thermal expansion coefficient difference of the materials of the cladding layer and the substrate. Under the steady thermal load, in order to avoid the interface failure of the cladding part, the design principle that the maximum interface shear stress can not exceed the interface shear strength of the corresponding cladding part material is proposed.