Validation of the tabulated Johnson-Cook model for a dynamic compression simulation
MAT224 is a tabulated version of the Johnson-Cook model in LS-DYNA.Compared with the original Johnson-Cook material, MAT224 was developed to simulate the dynamic response of a material by just defiming the effective stress as a function of effective plastic strain at different strain rates and temperatures, thus avoiding the tedious parameter fitting procedures in the traditional Johnson-Cook model.However, the stability and precision of solution is strongly dependent on the effective stress versus effective strain curves in MAT224, and unreasonable curve data will lead to warnings or errors in the process of solution.In the current study, a two-dimensional axisymmetric finite element model for the Ti6Al4V titanium alloy under dynamic compression was built, and MAT224 was employed.By investigating the effects of the curve numbers, strain ranges, data points, as well as changing tendencies, on the simulation results, the stability and the reliability for MAT224 are systematically studied.
MAT224 Ti6Al4V alloy dynamic compression
Li Guoju Fan Qunbo Gao Ruihua Liu Jintao Zhang Yipeng
School of materials and science and engineering of Beijing Institute of Technology, Beijing 100081 P.R.China;National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing 100081 P.R.China
国际会议
北京
英文
273-279
2014-10-19（万方平台首次上网日期，不代表论文的发表时间）