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本文采用一种计算机程序来预测燃烧时固体推进剂药柱裂缝内的弹道压力相互作用效应及压力引起的裂缝增长问题。本分析系统成功地将断裂力学有限元程序与弹道和裂缝燃烧计算程序结合起来,通过计算机程序,求出燃烧过程中每一时刻的变形和燃烧分布图。本法考虑了药柱表面和裂缝内侧面由燃烧引起的压力载荷,相应地提出了推进剂药柱因燃烧引起的断裂问题。本程序的设计区别了裂缝的燃完和裂缝的失控扩展。本程序业已改进,可用来处理由于点火器的变化和火焰传播效应引起的点火瞬变现象。
In this paper, a computer program is used to predict the ballistic pressure interaction and the pressure-induced crack growth in solid propellant grains during combustion. The analysis system successfully combines the finite element program of fracture mechanics with the program of ballistic and fracture combustion calculation and obtains the deformation and combustion distribution map of each moment in the combustion process by the computer program. This method takes into account the pressure load caused by combustion on the surface of the grain and the inner side of the crack, and accordingly raises the problem of fracture caused by the combustion of propellant grains. The design of this program distinguishes the expansion of cracks and the uncontrolled growth of cracks. This procedure has been improved to handle ignition transients caused by changes in igniter and flame propagation effects.