A modified Johnson-Cook model for tensile behaviors of typical high-strength alloy steel

The uniaxial tensile tests were conducted with the initial strain rates range of (0.0001-0.01)s(-1) and the temperature range of (1123-1373) K for typical high-strength alloy steel. Based on the experimental results, the modified Johnson-Cook model, which considers the coupled effects of strain, strain rate and deformation temperature, was proposed to describe the tensile behaviors of the studied alloy steel. Results show that the stress-strain values predicted by the proposed model well agree with experimental ones, which confirmed that the modified Johnson-Cook model can give an accurate and precise estimate of the flow stress for the studied typical high-strength alloy steel. (C) 2010 Elsevier B.V. All rights reserved.