Study on the influence of temperature and compressive stress on mechanical properties of porous propellants with special shapes

The mechanical properties of new propellants are an important basis for studying the internal stress propagation and damage mechanism of barreled weapons during use. Taking the porous special-shaped boundary propellant as the research object, Quasi-static compression experiments are conducted at different temperatures and different compression rates. Combined with stress-strain data, the effects of temperature and compression rate on the mechanical properties of the selected propellant are explored. At the same time, based on discrete element theory and EDEM simulation software, a simulation model with a porous special-shaped boundary structure can be established, then the Quasi-static compression experiment is simulated. The simulation result shows that the established simulation model can describe the stress propagation and deformation process of the propellant well under Quasi-static compression at 20°C. It provides an effective theoretical model basis for studying the damage mechanism of propellant in the barrel of barrel weapons. To explore the effects of temperature and compression rate on the mechanical properties of the propellants, Quasi-static compression experiments are carried out on porous special-shaped boundary propellants at different temperatures and compression rates. A simulation model considering the porous special-shaped boundary structure is established through DEM, and the stress expansion and deformation process of the propellant under Quasi-static compression is obtained. The simulation result shows that the established simulation model can describe the stress expansion and deformation process of the propellant well. The research results can be used as an effective method to study the mechanical properties of the propellant inside the barreled weapon.