Experimental study on the mechanical properties of AZ31B-H24 magnesium alloy sheets under various loading conditions

Fracture Characterization of Rolled Sheet Alloys in Shear Loading: Studies of Specimen Geometry, Anisotropy, and Rate Sensitivity

“…Thus, the loading condition is reasonably close to the shear state even for the large strain levels attainable in shear testing of DP780. For the isotropic DP780, it is possible to relate the strain increments ratio,  , to the stress ratio,  , using the Levy-Mises relation [47]: the mini-shear and butterfly specimens. It can be seen from Figure 12 that although there are some levels of DIC noise for strain increments ratios, for both DP780 specimens the triaxiality remains close to the desired zero value (shear state) up to large strain values.…”

Investigation on the ductile fracture of high-strength pipeline steels using a partial anisotropic damage mechanics model

“…In the fully coupled anisotropic fracture models, the influence of loading direction on the fracture strain or stress is considered by formulating a unified fracture criterion. The MMC model was extended to describe the anisotropic fracture behavior of aluminum alloys by Luo et al [54], TRIP780 advanced high strength steel, as well as the AZ31B-H24 magnesium alloy by Jia and Bai [57,58]. Khan and Liu [12] also extended the isotropic MSV ductile fracture criterion to further consider the influence of temperature, strain rate, pressure sensitivity, and anisotropy effects by incorporating the strain rate and temperaturedependent hardening law as well as the modified Hill anisotropic yield criterion.…”

Anisotropic fracture behavior of AZ31 magnesium alloy sheets as a function of the stress state and temperature

“…In [10] , the Modified Mohr Coulomb (MMC) fracture criterion was considered, which provided accurate failure prediction at room temperature as a function of complex stress states, including the dependency on the Lode angle parameter. The MMC fracture criterion was also found suitable to predict the shear-induced fracture in sheet metal forming as in [11] , whereas in [12] it was modified by adding a new plastic flow parameter to consider the sheet anisotropic behavior. However, the above mentioned studies on magnesium alloy sheets fracture prediction mostly refer to room temperature testing, whereas the same topic at elevated temperature as well as the influence the sheet anisotropy may have on ductility at varying loading conditions are very scarcely reported.…”