Calibration of Visco-SCRAM Model for Dynamic Compression Tests of a DNP-Based Melt-Cast Explosive

Carrying out the constitutive model research of melt-cast explosives is helpful to evaluate the safety of explosives, optimize the performance design, guide the material research, and improve the accuracy of engineering design. This study focuses on the development and calibration of the Visco-SCRAM (Viscoelastic Statistical Crack Mechanics) model specifically tailored for dynamic compression tests of a DNP (3,4-dinitropyrazole)-based melt-cast explosive. The Visco-SCRAM model, which combines viscoelastic effects with statistical crack mechanics, is particularly suited for capturing the complex mechanical behavior of melt-cast explosives under dynamic loading conditions. In this study, dynamic compression tests were conducted on DNP-based melt-cast explosive specimens using the Split Hopkinson Pressure Bar (SHPB) setup. The experimental data were then used to calibrate the parameters of the Visco-SCRAM model, including the viscoelastic parameters and the crack parameters. The calibrated model was validated through numerical simulations, demonstrating its ability to accurately predict the stress–strain behavior of the explosive under various strain rates and confining pressures.