基于非线性有限元理论的复合材料壳体缠绕参数优化设计

Optimization design of winding parameters of composite shell based on nonlinear finite element theory

本文基于非线性有限元理论,对承受内压载荷的复合材料壳体进行缠绕参数优化设计。采用截锥壳单元和薄壳理论建立了复合材料壳体强度分析模型,取得了与固体火箭发动机壳体水压试验吻合的结果,与商业有限元软件ABAQUS的对比结果表明该模型具有较高的计算效率,可以用于复合材料壳体的应力分析及爆破压力预测;采用该强度分析模型与遗传算法相结合对复合材料壳体螺旋层的非测地线缠绕滑移系数进行优化设计,得到在滑移系数为0.19时壳体的爆破压力最高,与测地线缠绕相比提高了10.7%。结果表明在设计复合材料壳体时,借助该平台可以针对螺旋层的滑移系数进行优化设计,使产品达到最佳的力学性能。

Based on nonlinear finite element theory,the winding parameters of composite shell under internal pressure was optimized.Based on the conical shell element and thin shell theory,the strength analysis model of composite shell was established.The results were in agreement with the hydraulic test results of solid rocket motor case,and the comparison results with the commercial finite element software ABAQUS show that the model has high computational efficiency and can be used in the stress analysis of the composite shell and the burst pressure prediction.The strength analysis model and genetic algorithm were used to optimize the slip coefficient of non-geodesic winding of composite shell.The results show that the bursting pressure is the highest when the slip coefficient is 0.19,which is 10.7% higher than that of geodesic winding.The results show that this platform can be used to optimize the sliding coefficient of the spiral layer to achieve the best mechanical properties of the composite shell.