A Modified Johnson-Cook Model for Advanced High-Strength Steels Over a Wide Range of Temperatures

作者：Zhang Qingdong^*; Cao Qiang; Zhang Xiaofeng

来源：Journal of Materials Engineering and Performance, 2014, 23(12): 4336-4341.

DOI：10.1007/s11665-014-1236-9

• advanced high-strength steel
• constitutive equation
• Johnson-Cook model
• warm deformation

Advanced high-strength steel (AHSS) is widely used in automotive industry. In order to investigate the mechanical behaviors of AHSS over a wide range of temperatures, quasi-static tensile experiments were conducted at the temperatures from 298 to 1073 K on a Gleeble-3500 thermo-simulation machine. The results show that flow behaviors are affected by testing temperature significantly. In order to describe the flow features of AHSS, the Johnson-Cook (JC) model is employed. By introducing polynomial functions to consider the effects of temperature on hardening behavior, the JC model is modified and used to predict flow behavior of AHSS at different experimental conditions. The accuracy of the modified JC model is verified and the predicted flow stress is in good agreement with experimental results, which confirms that the modified JC model can give an accurate and precise estimate over a wide range of temperatures.

• 出版日期2014-12
• 单位北京科技大学