Inverse Identification at Very High Strain Rate of the Johnson–Cook Constitutive Model on the Ti‐6Al‐4 V Alloy With a Specially Designed Direct‐impact Kolsky Bar Device

In the present work, an inverse identification of the Johnson–Cook constitutive model is performed on the titanium alloy Ti‐6Al‐4 V at three strain rates until about 2·104 s−1 (till about 1.1·104 s−1 of plastic strain rate) on a specially designed direct impact Kolsky bar device. First, the design of such a device must meet several criteria, and is shown to be the solution of an optimization problem. A systematic design procedure for such a device is then introduced. Second, an inverse analysis using the finite element code ABAQUS is carried out to identify the Johnson–Cook parameters on experimental data obtained with the designed system.