Dynamic mechanical performance and constitutive model for Zr₅₈Cu₁₂Ni₁₂Al₁₅Nb₃ metallic glass

In this study, compression tests under quasi-static and dynamic states and plate impact experiments were performed on Zr₅₈Cu₁₂Ni₁₂Al₁₅Nb₃ bulk metallic glass (BMG). The experimental results demonstrated that the BMG specimen fractured catastrophically without noticeable plastic deformation. Therefore, the Johnson-Holmquist II (JH-2) constitutive model was used to describe the mechanical response of the presented alloy. The constitutive parameters of the Zr-based BMG were determined from the experimental results based on the JH-2 constitutive equations. Subsequently, the constitutive model with the presented material parameters was programmed in the commercial finite element analysis software LS-DYNA to simulate the dynamic compression and penetration process. The good agreement between the numerical simulations and experimental results indicates that the obtained JH-2 constitutive parameters are accurate and effective.