Comparative study of critical plane fatigue criteria on multiaxial variable amplitude loaded welded test specimens

This paper evaluates three critical plane criteria, namely the Findley, Matake and modified Wöhler curve method compares them to IIW’s implementation of Gough–Pollard criteria. Assessment is conducted on a large set fatigue data thin-walled tube–tube laser beam welded specimens made magnesium aluminum alloys that were tested under proportional/non-proportional constant/variable amplitude loading. Each criterion evaluated based their assessment reliability using both design experimental S-N curves. The approaches show encouraging results for weld but lead non-conservative in comparison • Multiaxial variable thin specimens. Comparison multiaxial Notch stress approach applied joint fatigue. IIW predicts conservative life estimations.