Abstract: The multiaxial fatigue behavior of 2A12 aluminum alloy was studied via SDN100/1000 electro-hydraulic servo tension-torsion fatigue tester under different phase angles and the failure mechanism was analysed by cyclic curve of loading and microscopic morphology. The miner model, Manson damage curve model and toughness degradation model were used to evaluate the accuracy of fatigue life prediction, and the Manson damage model would be revised in order to improve the prediction accuracy. The results show that: under the one-stage loading, the fatigue life decreases approximately linear with the increasing of the sine of phase angle. For the phase angle 0°, hardening and softening appear alternately in the axial direction, cyclic hardening shows in torsional direction. The effect of action in axial and torsional direction is significant for the 90° phase angle. The fatigue life prolongs with the cycle of first stage loading increases under the two stage cumulative paths. The hardening appears in axial and torsional directions for the 0° loading, and the multi-crack initiation morphology is observed under the two cumulative paths. The stepped pattern can be detected near the crack initial region, as well as the scratch and scale pattern in the crack extension zone. A prediction error of lower than 15% was achieved for the modified Manson damage curve model.
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2017, Vol. 31 
