固体火箭发动机复合材料壳体裙连接区结构数值分析

对某固体火箭发动机纤维缠绕复合材料壳体轴压载荷作用下裙与筒段连接区(裙连接区)进行了有限元结构分析。依照壳体的结构特征和受力特性建立了裙连接区3D简化分析模型,通过对某芳纶纤维壳体仿真结果和实验数据的对比分析,验证了模型简化的合理性和有限元结果的正确性;最后对某炭纤维缠绕复合材料壳体裙连接区进行了数值分析和壳体连接区结构方案改进。结果表明,增加补强层厚度和提高补强层纤维模量可有效降低应变极值,改善结构应力分布,经改进的结构设计方案承载能力可提高20%。

Numerical analysis on lap structure between skirt and composite SRM case

The FEM structural analysis of the lap structure between skirt and composite case of SRM(LBSCC) when bearing the thrust load was carried out based on the ANSYS FEM software.The simplified 3D analysis model was built referring to the case structure and loading distribution characteristic.The rationalization of the simplified model and validity of the FEM results were confirmed according to the comparing study of simulation results with experiment data of a APMOC fiber wound composite case.Finally,the numerical analysis and structural improvement design of a carbon filament winding cases was implemented.Analysis results show that increasing the thickness or the material stiffness of the reinforced layers can decrease the strain extreme significantly and improve the strains distribution of the case.The load bearing capability of the improved structural design can be increased by about 20%.