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Abstract
Fatigue experiments with solid cylindrical bar specimens were carried out to investigate the effects of mean shear stress on the torsion fatigue failure behavior of 2A12-T4 aluminum alloy. The torsion S–N curves under different values of mean shear stress were obtained. Experiment results showed that fatigue life under the same shear stress amplitude gradually reduces with increasing the mean shear stress, when mean shear stress is lower than a threshold value. Macro-analysis and micro-analysis of specimen fracture appearance were conducted in order to obtain the fracture characteristics for different mean shear stress values under torsion fatigue loading.
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