The quasi-static tensile experiment and Split-Hopkinson Tension Bar (SHTB)experiment of AZ31B magnesium alloy have been studied under a strain rate range of 0.001–3000 s−1 at a temperature range of 20–250 °C. A empirically based constitutive and fracture model, Johnson–Cook (J–C) model, have been proposed to incorporate strain rates and temperatures effect on the stress–strain relation. The models can describe the stress–strain relations of metals over a wide range of strain rates and temperatures. The effects of strain rates and temperatures on the material's behavior were discussed. Based on the tensile state experimental technique, the aim was to determine the material constants of the constitutive and fracture models according to the experiments. The constitutive model and fracture model of J–C employed in 3D finite element software ANSYS and ABAQUS to describe AZ31B magnesium alloy electromagnetic bulging and failure behavior. Good agreement is obtained between the numerical simulation results and the experiment results. It indicates that it is valid using the J–C constitutive and failure models to describe or predict the electromagnetic bulging and failure response of materials.

As the lightest structural metal, magnesium (Mg) is attracting increasing interest from both the industrial and academic fields. Magnesium alloy parts are mainly processed by die casting due to their poor sheet formability at room temperature. Warm forming is a popular method of forming; Mg alloy sheets produced in this manner show excellent formability around 200–400 °C. Electromagnetic forming (EMF) can improve the formability of metal sheets without the need for lubricants. In this paper, a new approach, called warm and electromagnetic hybrid forming (WEMF), is presented. The effects of voltage, capacity, and temperature on the bulging height of Mg alloy sheets are investigated. Results show that the bulging height of Mg sheets increases with moderate discharging energies. Enhancing the discharging voltage is also a more efficient method for increasing bulging height compared to simply increasing the capacity. When the discharging energy is kept constant, the bulging height first decreases (<150 °C) and then increases (>150 °C) from room temperature to 230 °C. The formability of Mg alloy sheets improves with increasing temperature, while the forming efficiency of WEMF decreases under similar conditions.