|About this Abstract
||NUMISHEET 2021: The 12th International Conference on Numerical Simulation of 3D Sheet Metal Forming Processes
||Identification of Dynamic Hardening Properties with Acceleration by the Virtual Fields Method
||Ji-Min Kim, Jin-Hwan Kim, Frédéric Barlat
|On-Site Speaker (Planned)
In this study the Virtual Fields Method (VFM), which is an inverse method used to determine constitutive coefficients, is employed for the identification of dynamic hardening properties solely by the utilization of the experimental acceleration, not the load data. First, a numerical-experimental methodology is introduced to assess the minimum acceleration magnitude to retrieve the dynamic hardening properties. Then, the main features of a relatively new type of high strain rate tester, the impact frame high speed (IFHS) tester is described. Experimental aspects to increase the acceleration magnitude are discussed for an optimum application of the methodology. DP980 steel is used and the maximum acceleration of 9x10^5 m/s˛ is obtained. The Johnson-Cook coefficients are calibrated using the VFM based two approaches. One uses the external virtual work and the acceleration virtual work. The other uses only the acceleration virtual work. The constitutive coefficients determined are compared and the results are discussed.
||Definite: At-meeting proceedings