On the interaction of axial and bending loads in the weld root fatigue strength assessment of load-carrying cruciform joints

Abstract Current design standards and recommendations incorporate the nominal stress system for assessing fatigue strength capacity of load-carrying cruciform (LCX) joints with fillet welds failing from weld root. Thus far, bending-loaded have not been addressed in these standards. The aim present study is to investigate performance LCX subjected cyclic axial bending loads. Firstly, test data sets such loading loads adjoined plate component are extracted literature, statistical analyses carried out evaluate using stresses (NWSs). Secondly, experimental tests on made ultra-high-strength steel (UHSS) grade constant amplitude combined load interaction effects capacity. results showed that FAT36 detail category root failures applicable when applying NWSs calculated basis effective throat thickness assuming linear-elastic distribution over joint section. notch unconservative tested joints, FAT225 curve reference radius r ref = 1.0 mm.