Abstract
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. In this paper, the Karagozian & Case model is applied to melt-cast explosives for the first time. Taking the 3,4-dinitropyrazole-based melt-cast explosive as an example, quasi-static compression mechanical property, dynamic compression mechanical property and quasi-static Brazilian disc tests of its typical formulation were carried out by the universal materials testing machine and the split Hopkinson pressure bar test setup. Based on the test results, the parameters of the Karagozian & Case model were calibrated. Using the calibrated model parameters, the mechanical responses of the 3,4-dinitropyrazole-based melt-cast explosive under dynamic impact, quasi-static compression and triaxial confining pressure were calculated. The results show that the model’s capability in describing the complete mechanical behavior of melt-cast explosives, from elastic deformation through damage evolution to ultimate failure. The Karagozian & Case model effectively reproduces the material’s strain-rate sensitivity and accurately captures the transition from brittle to ductile behavior under confining pressure. Consequently, the Karagozian & Case model is established as an effective tool for predicting the mechanical response of melt-cast explosives under various loading conditions, and valuable insights are provided for safety evaluation and performance optimization in engineering applications.