Study on the mechanical properties of RDX based melt cast explosives at different temperatures

DOI:	10.11809/bqzbgcxb2024.03.001
Keywords:	RDX; melt cast explosives; mechanical properties; particle flow code; temperature
Abstract:	In order to investigate the effect of temperature on the mechanical properties of RDX based melt cast explosives, uniaxial compression tests and direct tensile tests were conducted. A corresponding numerical model was established using Particle flow code and numerical simulation experiments were conducted to study the mechanical properties of RDX based melt cast explosives at different temperatures. The results indicate that in the study of the micro damage mechanism of specimens under different stress states at different temperatures, it was found that temperature significantly affects the compressive strength, tensile strength, and elastic modulus of the specimens, and the resistance to deformation is significantly dependent on temperature. As the temperature increases, the peak strength of the sample increases, and the elastic modulus first increases and then decreases. According to the development and evolution process of micro cracks, contact force chains, and particle displacement fields, it can be seen that the lower the temperature, the fewer the number of blocks after sample failure, and the more likely it is to experience stress concentration and local failure. After complete sample failure, the number of cracks decreases with the decrease of temperature, the number of contact force chains increases, and the direction of particle displacement gradually becomes orderly from complex dispersion, and the resistance to deformation increases.
Published:	2024-03-28
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