组分对CMDB推进剂抗过载性能的影响

The propellant grains used in gun-launched missiles are subjected to high overloads up to thousands of g during launching,and therefore these propellants have to be robust enough to the overloading.According to uniaxial compression experiments of three CMDB propellants over a wide range of strain rates at 20 ℃,the effect of solid filler content on the yield stress of CMDB propellants has been analyzed,and Prony constitutive models of the three CMDB propellants have been established.A finite element simulation model of a typical grain has been established to carry out numerical calculation.The difference of mechanical response and the anti-overloading performance of the three CMDB propellants under high overloads are compared.The results show that these three propellants have the same maximum stress under a fixed load condition,and the propellant with higher yield stress at a given strain rate has better anti-overloading performance.At 20 ℃,the CMDB propellant formulation has an optimum solid filler content,and hence provides the best anti-overloading performance.