抄録
A new simple method for identifying the parameters in the constitutive equation for an elastic/visco-plastic material is proposed. In the proposed method, the time-histories of the input and output stresses in the split Hopkinson's bar test are measured, and a finite element calculation is performed using the measured time history of the input stress. The identification employing the Kalman filter is carried out by comparing the calculated results with the measured time history of the output stress. To demonstrate the usefulness of the proposed method, a split Hopkinson's bar test is performed using copper specimens, and two parameters characterizing the visco-plasticity are identified.
