固体火箭发动机复合材料壳体承载力分析

为了提高固体火箭发动机(SRM)的外载荷承载能力,研究了其复合材料壳体的失效机制,提出了复合材料壳体的增强改进结构形式。通过提高复合材料外缠绕层的轴向刚度和横向弯曲刚度,使得连接区域内的内、外缠绕层的轴向变形相协调,改善了内、外缠绕层的轴向承载分配,使增强改进后的复合材料壳体结构的承载能力提高了124%,而结构质量增加低于10%。研究结果表明: SRM复合材料壳体承载能力的关键因素是连接区域内复合材料内、外缠绕层的刚度匹配设计,只有保证连接区域内的刚度匹配和位移变形相协调,才能充分发挥复合材料壳体的承载能力。

Load-bearing capacity analysis of composite case structure of solid rocket motor

In order to improve the external load-bearing capacity of solid rocket motor (SRM), the failure mechanism of the composite case structure was studied, and the form of improved structure for composite case structure was put forward.The composite case structure was improved by increasing axial stiffness and lateral bending stiffness of the exterior layer.The axial deformations of interior and exterior layers were in concordance, and the axial load-bearing capacity distribution of exterior to interior layers was improved.The load-bearing capacity of the improved composite case structure was largely increased by about 124% and the structural mass was only increased by less than 10%.Results indicate that the stiffness matching design of the lap-joint interior and exterior layers is the key factor that affects the load-bearing capacity of the composite case structure of SRM.The composite case structure of SRM has the load-bearing capacity well only on condition of coordination of the stiffness match and deformation in lap-joint interior and exterior layers.