Fatigue assessment of welded joints in AlMg 4,5Mn aluminium alloy (AA 5083) by local approaches

Three different local stress approaches, the stress averaging approach, the highly stressed volume approach and the crack propagation approach were applied to the fatigue assessment of welded joints in AlMg 4,5 Mn aluminum alloy (AA 5083) with different stress concentrations and plate thickness. These approaces rendered strength or life estimates with acceptable accuracy in the high-cycle fatigue range (N=> 5 x 10) under certain conditions. However, for good predictions in the finite fatigue life range (N<5 x 10hoch6) the methods must be improved.