Abstract:
To investigate the dynamic mechanical properties and tensile-compression asymmetry of S30408 stainless steel, dynamic impact tests were carried out on stainless steel at three strain rates (1000 s
−1、3000 s
−1、5000 s
−1) using Hopkinson tensile (SHTB) and pressure bar (SHPB) device, and static tensile and compression tests were carried out. The stress-strain curves of S30408 stainless steel under different conditions were obtained, and the analysis revealed that S30408 stainless steel has an obvious strain rate strengthening effect. There is a certain tensile-compression asymmetry in S30408 stainless steel under static conditions, which will be amplified under high strain rate conditions, and the plastic stress in S30408 stainless steel in compression is significantly larger than that in tension. Based on the experimental results, a modified Johnson-Cook model was established for tensile and compressive conditions, which can better reflect the dynamic mechanical properties of S30408 stainless steel and can provide a reference for the study of the mechanical properties of S30408 under high strain rates such as impact and explosion.