Critical damage value of AZ31B magnesium alloy with different temperatures and strain rates

The uniaxial tensile tests were carried out at temperature ranging from room temperature(RT) to 523 K under strain rates of 0.001,0.010 and 0.100 s-1to obtain the flow stress of AZ31 B magnesium alloy.The tensile tests were simulated by the finite element method(FEM) to calculate the critical damage values(Dc) of the CockcroftLatham criterion to predict the occurrence of fracture defects.Finally,the effects of temperature and strain rate on Dcwere analyzed to predict the critical damage value’s evolution.The results demonstrate that the critical damage value changes in the range of 0.188-0.718.It increases as strain rate decreases at constant temperature,and increases with the increase of temperature under certain strain rate,but is more sensitive to the temperature.