Local Stress–Strain Estimation for Tenon Joint Structure under Multiaxial Cyclic Loading at Non-isothermal High Temperature

In this paper, a method based on the improved effective stress concentration factor is proposed to estimate the local stress–strain for tenon joint structure under multiaxial cyclic loading at non-isothermal high temperature. In order to consider the effect of changing temperature on material properties, the impact caused by temperature on the stress–strain response needs to be introduced to the parameters of material constitutive model. So that, each material parameter in viscoplastic constitutive model is expressed as a function of temperature. In addition, the computing method of the effective stress concentration factor is improved so as to solve the problem of the overestimation for local stress–strain of tenon joint structure in the Neuber rule. Moreover, the proposed notch correction method is coupled with the Chaboche unified viscoplastic constitutive model to estimate the local stress–strain of tenon joint structure at non-isothermal high-temperature condition. To verify the reliability of the proposed method, the calculation results are compared with the nonlinear finite element analysis results under various loading paths at non-isothermal high-temperature condition. The results showed that the proposed method can accurately estimate the notch stress and strain under multiaxial thermo-mechanical cyclic loading.