To reflect the influence of material property changes caused by temperature history on welding residual stresses, this paper conducts a study on residual stress calculation using a combination of molecular dynamics (MD) and finite element (FEM) methods. Firstly, a multi-scale material property calculation method is established using the theory of MD-FEM to calculate the problem of material property transformation under high-temperature history. Then, a residual stress calculation model that considers the effect of material recrystallization (RE-Model) is established using finite element method (FEM), and the study of residual stress calculation is conducted. Furthermore, the fatigue lifespan of a T-joint welding structure is calculated using the multi-axis fatigue lifespan method. The results show that the fatigue lifespan calculated by the RE-Model is reduced by more than 20% compared with the traditional residual stress calculation model, proving the importance of considering recrystallization effects in the calculation of welding structure strength.
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