Abstract
This work presents a test method and the analytical procedure for materials under complex stress/strain state without the expensive multi-axis experimental machine. The deformation and mechanical responses of Mg alloy under combined shear-compression loading are investigated through a specific loading device. The deformation process and strain path of specimens with various loading angles are discussed based on digital image correlation (DIC) technology. Results show that the combined strain/stress state can be obtained through introducing the additional shear component. However, the loading angle almost has no effect on strain/stress path. In addition, the traditional testing machine equipped with combined loading device provides a new method to carry out the proportional loading test. A modified yield criterion considers Tresca-type material and tension-compression asymmetry is proposed to capture the mechanical characteristics of AZ31b Mg alloy. Based on the investigation, the combined test procedure can be regards as an ideal method in creation of materials database which focus on accurate description about the mechanical and fracture behaviors of materials.
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