固体火箭发动机燃烧室过载下的三维应力分析

Three-dimensional stress analysis in solid rocket motor chamber under overload

采用三维线性粘弹性有限元模型,对固体发动机药柱、绝热层和壳体的应力场进行了分析,得出了固体发动机在轴向和横向过载作用下的应力。结果表明,药柱的前后端、翼槽和壳体-绝热层交界面均是产生裂纹或脱粘的危险部位,为固体发动机的结构完整性分析和结构设计提供了依据。

The stress fields of grain, insulation and case of solid motor were analyzed by means of three-dimensional linear vis-coelasticity finite element model, and the stress of solid motor under axial and transverse overload were obtained. The results show that the fore and aft end, fin slots of grain and ease-insulation interfaces all are the critical parts of cracks or debond. The results provide a basis for the structural integrity analysis and design of solid motor.