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This paper presents calculations of fatigue life of aluminium welded joints (tube-tube and flange-tube) under pure bending, pure torsion, and combined in- and out-of-phase bending with torsion, compared with against experimental results. In order to reduce a multiaxial loading state to an equivalent uniaxial state, an energy-based criteria is applied in the critical plane where cracking occurs. The best results were obtained using the criterion of maximum shear strain energy density for calculating equivalent local stress amplitude for tube-tube welded joints, for both proportional and non-proportional bending with torsion. For flange-tube joints under proportional and non-proportional bending with torsion, the best results were obtained using the criterion of maximum shear and normal strain energy density.

Predicting fatigue life of welded aluminium joints with combined bending and torsion using energy based criteria *