Mechanical properties and constitutive model of Sn-58Bi alloy

Sn-58Bi alloy is a strain-rate-sensitive material. To study the mechanical properties of Sn-58Bi alloy, an MTS universal testing machine and split-Hopkinson pressure bar were used to conduct quasi-static and dynamic testing on Sn-58Bi alloy, obtaining the stress-strain curve of Sn-58Bi alloy at the strain rate of 0.001-6316 s(-1). By comparing the tensile and compressive stress-strain curves of Sn-58Bi alloy under quasi-static conditions, it is found that Sn-58Bi alloy is brittle, with its tensile yield strength lower than its compressive yield strength. By comparing the compressive stress-strain curves of Sn-58Bi alloy at different strain rates, it is found that the yield strength of Sn-58Bi alloy increases with increasing strain rate, and a strain-hardening phenomenon is manifested at high strain rate. By revising the Johnson-Cook constitutive model, the constitutive model of Sn-58Bi alloy at different strain rates was established, with the calculated results of the model in good agreement with the experimental results.

Automated summary

This study investigates the mechanical properties of Sn-58Bi alloy through quasi-static and dynamic testing. It is found that Sn-58Bi alloy is brittle, with a lower tensile yield strength compared to its compressive yield strength. The yield strength of Sn-58Bi alloy increases with increasing strain rate, and a strain-hardening phenomenon occurs at high strain rates. The revised Johnson-Cook constitutive model accurately predicts the mechanical behavior of Sn-58Bi alloy.