The effect of solid additive particle size on the mechanical properties of modified double base propellants
In order to study the mechanical properties of modified double base propellants in a underwater launch device,the mechanical properties of modified double base propellants with different particle sizes of Al powder and SiC/Al2O3 were compared and analyzed by adjusting the particle size of solid additives.The results show that in Al/SiC pro-pellants,the tensile strength and maximμm elongation at room temperature of the propellant show a trend of first decreasing and then increasing with the increase of Al powder particle size;The mechanical properties of the propellant exhibit differ-ent trends with the variation of SiC particle size under different Al powder particle sizes.When the particle size of Al powder is 20 μm and the particle size of SiC is W2.5,the tensile strength at low temperature and room temperature is the highest,with 37.5 MPa and 6.58 MPa,respectively;When the particle size of Al powder is 140 μm and the particle size of SiC is W1.5,the highest high-temperature tensile strength is 2.22 MPa;After adding Al2O3 instead of SiC,the maximμm low-tem-perature tensile strength is 38.3 MPa,which is 2.1%higher than the propellant using SiC as a ballistic stabilizer.The maximμm low-temperature tensile strength is 7.1%higher,and the maximμm high-temperature tensile strength is 4.3%high-er.It is concluded that by adjusting the solid additives Al powder and SiC/Al2O3 particle size,local regulation of the mech-anical properties of modified double base propellants can be achieved,providing effective means for the propellant formula-tion design of underwater launch devices.
modified double base propellantssolid additivemechanical propertiestensile strength