Effect of the aging of propellant charge on drop safety

DOI:	10.11809/bqzbgcxb2023.02.002
Keywords:	long term storage; aging; dropping safety; mechanical sensitivity; finite element analysis; dynamic response
Abstract:	To explore the effect of the aging degree of propellant charge on drop safety under a long term storage condition, this paper tests the mechanical properties and safety for charges with different storage periods. Based on the analysis of material parameters, and mechanical response as well as load conditions in the dropping process of a gas generator and propellant charge, a constitutive model containing aging damage functions is implemented, and the simulation nephogram of the relevant dropping parameters of the gas generator and the charge is obtained by using the ANSYS/LS DYNA software to carry out the finite element modeling and numerical simulation of the dropping process of the gas generator. As a result, loading stress, strain, displacement and pressure changes of the propellant charge at different aging degrees are comparatively analyzed. The comprehensive analysis of the performance test and simulation results shows that there is a significant correlation between the aging of the propellant charge and dropping safety. With an increase of the storage period, mechanical properties of the charge weaken, and friction sensitivity and impact sensitivity rise, which makes the probability of deformation, damage and explosion of the propellant charge under dropping impact increases. Therefore, the dropping safety reduces significantly.
Published:	2023-02-28
PDF HTML