Research on Opening Performance of Metal Diaphragm in Double Pulse Solid Rocket Motor

Abstract

In order to investigate the effect of different double-pulse solid rocket motor metal diaphragm configurations on opening performance, a compartment device is designed. A modified Johnson-Cook principal structure model and damage criterion are used to simulate the pressure-bearing forces of the compartment structure based on finite element software. In order to obtain the parameters of J-C model, Quasi-static tensile tests at the strain rates of 10−4~10−1s−1 and temperatures of 300K~450K were carried out on 2A12 aluminium alloy dumbbell-type specimens. By varying the depth and width of the indentations on the metal diaphragm, and the finite element numerical simulation of the operation of the compartment under the action of solid rocket motor I and II pulses is also carried out. The results show that when the indentation depth is large, the indentation depth is the main factor affecting the opening pressure of the diaphragm; when the indentation depth decreases, the influence of the indentation width on the opening pressure of the diaphragm is more obvious.