Abstract
Biaxial tension-tension cyclic loading tests were conducted with cruciform shaped specimens using AZ31 Mg alloy sheet, which produced by warm rolling. The residual stress of the sample surface can be obtained by in-situ measurement of x-ray under biaxial low cyclic loading. The surface fracture morphology of the cyclic load test specimens was examined by scan electron microscopy (SEM) and optical microscope. From the results, it was found that the compressive residual stress occurs at crack tip in Y-axis direction. Crack nucleation is earliest in the load ratio r=1. In addition, the crack initiation angle is different due to the coupling effect of KI and KII in mixed modes I and II for 45° case. The crack propagation rate was significantly influenced by the non-singular stress parallel to the crack when it was correlated to the stress intensity range.The surface of the case of 90° is similar to that of the case of 45°, and striation-like-patterns and twin boundaries were observed in the specimens.
Published Version
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