Fatigue design values for welded joints of the wrought magnesium alloy AZ31 (ISO-MgAl3Zn1) according to the nominal, structural and notch stress concepts in comparison to welded steel and aluminium connections

The following investigation provides knowledge about the fatigue behaviour of welded wrought magnesium alloy AZ31 (ISO-MgAl3Zn1). Three different types of joints, fully penetrated and partially penetrated butt welds, transversal stiffeners, were tested under fully reversed (R = -1), pulsating (R = 0) and high mean tensile (R = 0.5) loadings. The results were presented according to the nominal, structural (hot-spot) and notch stress (rf = 1.0 and 0.05 mm) concepts. For these four concepts the FAT - values according to IIW- Recommendations were derived and compared with those already known for welded steel and aluminium joints.