Dynamic Mechanical Properties and Fracture Threshold of Ultra-high Strength Steel G31

Abstract

In order to study the dynamic mechanical properties of ultra-high strength steel G31, the dynamic and static mechanical properties of G31 were obtained through the dynamic and static mechanical properties experiments of G31, and the constitutive equation of G31 was obtained by fitting the experimental data. The metallographic images of the samples before and after the experiment were observed by metallographic microscope. The results show that under the condition of dynamic compression, the mechanical behavior of G31 shows the strain strengthening stage in the early stage of deformation and the temperature softening stage in the late stage of deformation. The experimental curve in the late stage of deformation is quite different from the fitted constitutive equation curve. The simulation results show that the deformation temperature rise is the main reason for the difference. The results show that the adiabatic shear fracture occurs at high strain rate. The threshold range of adiabatic shear fracture was calculated by related theory.