Combined Shear-Compression Responses of AZ31B Magnesium Alloy Based on Inclined Specimens

Combined shear-compression tests were conducted on AZ31B Mg alloy through inclined specimens. Digital image correlation (DIC) was used to analyze the deformation and strain field of inclined specimens. Results show that the strain field of inclined specimen is no longer uniform. The loading angle only affects the distribution of shear strain and almost has no effect on the normal strain components. Additionally, the strain path also can be controlled by the loading angle. The inclined specimen with a larger loading angle can be regarded as the proportional loading while the strain path is non-proportional for the specimen with a smaller loading angle. The inclined specimen (20 degree) leads to a larger shear-compression ratio of 0.391, while the ratio becomes 0.304 as the loading angle decreases to 15 degree. The shear-compression ratio in stress components equals to sin theta cos theta based on the analysis on deformation mode of inclined specimen. Based on stress analysis, the experimental yield surface is obtained and found coincides with theoretical asymmetric function.