Inverse Characteristic Analysis of Ramp Loading Experiments

An inverse numerical method based on the characteristic curve was presented for better understanding of the mechanical behavior of materials under ramp loading.Numerical verification, uncertainties propagation and application of the inverse calculation were performed.From the measured velocity profiles of the stepped aluminum sample under the quasi-isentropic compression on the CQ-4 pulsed power facility, the wave propagation inside the sample was calculated using the inverse characteristic curve method and other methods.The calculated Lagrangian sound speed and the elastic limit of materials show that the inverse characteristic analysis can play a significant role in obtaining some key data of ramp loading experiments without having to rely on any constitutive model.