STIMA DELLA VITA A FATICA BASATA SUL PEAK STRESS METHOD DI GIUNZIONI SALDATE DISSIMILI TESTA-A-TESTA IN AISI 316L TRA PIATTI OTTENUTI DA ADDITIVE MANUFACTURING E LAMINATI

In this study, the fatigue strength of dissimilar and additive-additive welded joints in austenitic stainless steel was investigated. A reanalysis of data obtained from the literature was conducted using a nominal stress approach. It was found that the existing standards for structural steel joints do not accurately capture the behaviour of these joints. The data were reanalysed using a local approach: the Peak Stress Method (PSM). Since the behaviour of traditional austenitic stainless-steel joints was not adequately represented by the existing PSM band for structural steels, a new band was calibrated specifically for this class of steels. This band was validated with data from dissimilar and additive-additive joints, which demonstrated fatigue strength comparable to that of traditional joints belonging to the same class of steels.