轴向过载下固体推进剂装药内外径比和长径比对结构完整性影响的规律研究

Influence of Diameter Ratio and Length-diameter Ratio on Structural Integrity of Solid Propellant Grains under Axial Overload

在固体火箭发动机装药设计中,一般将药柱的内外径比定义为m数(m=R/r),为研究装要设计参数m数和长径比在轴向过载条件下对装药结构完整性的影响,采用三维粘弹性模型,通过选取9种m数以及6种长径比,共54个计算模型,对装药完整性进行了计算,结果表明轴向过载条件下药柱最大等效von Mises应力、应变值受药柱m数以及长径比共同影响。并得出当长径比大于3时,其对药柱最大等效von Mises应力、应变基本没有影响的结论,为固体火箭发动机药柱结构设计时m数和长径比的选择提供理论参考。

The three-dimensional linear viscoelastic model was used for analyzing the influence of number m and length-diameter ratio on structural integrity of solid propellant grains under axial overload. Nine different numbers m and six length-diameter ratios for fifty-four models were selected to measure effect On structural integrity. The results shows that number m and length-diameter ratio have cooperative effect on the maximum value of equivalent yon Mises stress and strain. If length-diameter is more than 3, it has less influence on the maximum value of equivalent yon Mises stress and strain, and it can be referred to the selection of number m and length-diameter in structure design of solid propellant grain.