Mechanical properties of steel wires of 1670 MPa, 1770 MPa, and 1860 MPa grades under high strain rates and temperatures

Abstract

In this study, the mechanical behavior under high strain rates and high temperatures of 1670 MPa, 1770 MPa, and 1860 MPa grades steel wires were investigated. Quasi-static tensile experiments (10−4 s−1), split Hopkinson compression bar experiments (102–103 s−1) and high-temperature tensile experiments were conducted (20–900 °C). A total of 89 samples were tested for the study. Stress-strain curves were obtained for different strain rates and different temperatures. The experiments indicated that the strain rate had an obvious influence on the behavior of high-strength steel wires, both the yield and ultimate strength increased with increasing strain rate. The strength ratio and strain rate sensitivity coefficients of high-strength steel wires were investigated for high strain rates. The mechanical properties of the steel wire are significantly reduced under high temperatures. The Cowper-Symonds (C-S) and Johnson-Cook (J-C) constitutive models were determined using experimental data. By contrasting the proposed models with the experiment data, the precision of the constitutive models was confirmed.