The safety assessment of welded structures still remains an important industrial problem. In this study, a simple diffusion bonded bi-material jonction has been made in order to analyse the mismatch effect. It consists of an assembly of ferritic and austenitic steels which are representative of nuclear pressure vessel. Each material has been tested using smooth and notched tensile bars. These tests were used to adjust the parameters of local approach based on the Rousselier model. Bi-material structures including notch tensile bars, Charpy specimens and single-edge notch bend specimens were tested and simulated using the Finite Element method. The correct test/computation agreement shows that the adjusted parameters on the homogeneous specimens can be transferred to heterogeneous structures.

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