Combustion and impact performance of DEGDN propellants under different size conditions

DEGDN propellant plays an important role in the use of large-caliber artillery, and its combustion and mechanical properties determine the power of large-caliber artillery. In order to study the combustion performance and mechanical properties of DEGDN propellant, four kinds of single-hole propellant with different pore diameters were prepared from DEGDN raw material ZY-11 pellets, with pore diameters of 3mm, 4mm, 5mm, and 6mm, which were recorded as 45/1-3mm, 45/1-4mm, 45/1-5mm, and 45/1-6mm, respectively. Analyze its combustion performance using closed bomb and test its impact resistance using a pendulum impact tester. The experimental results show that in the combustion process, the combustion pressure of the propellant in the higher temperature conditions, the faster its growth rate, while the whole combustion process is also faster; combustion process combustion speed will not change with the change of the aperture, only the different temperature conditions will make the combustion speed change, the higher the temperature of the maximum combustion speed it can achieve the larger. When the pore diameter is 4mm, the impact strength reaches a maximum of 30.6KJm-2, which is nearly 40% stronger than 45/1-3mm and 45/1-6mm.