固体火箭发动机纤维缠绕壳体承载能力研究

为解决某型固体火箭发动机复合材料壳体承载轴压与弯矩能力不足问题,依据原壳体实体及其在轴压与弯矩联合载荷作用下的静力试验,建立了该壳体的有限元数学模型,并进行了静力计算和稳定性分析。计算分析表明,原壳体破坏的原因是层间剪切强度失效,复合材料基体开裂,局部屈曲和后屈曲破坏发生在铝裙尖端部位。提出用S-2玻璃纤维代替F12纤维做为裙外铺层改进原壳体结构,有效地约束了屈曲波形,提高了结构承载能力,解决了工程难题。

The Research on Load-Bearing Capacity of Solid Rocket Motor Fiber Composite Material Shell

In order to solve the insufficient problem of load-bearing capacity,authors established the finite element model of solid rocket motor fiber composite material shell by load-bearing test of the real shell.The calculation and analysis of buckling under partially axis load indicate that the reason of the former shell structure breakage is not because of the shear intension invalidation inside fiber composite material layers,but the buckling breakage locates in the skirt tip area.In order to modify shell,S-2 glass fiber is substituted for F12 fiber besides the skirt.Thus much,the load-bearing capacity of the shell is improved and the engineering demand is met.