复合材料格栅结构扁球壳的外压稳定性分析

BUCKLING RESPONSE ANALYSIS OF THE GRID STIFFENED COMPOSITE SHALLOW SPHERICAL SHELL UNDER EXTERNAL PRESSURE

采用有限元法分析均布外压作用下复合材料扁球壳结构的屈曲和后屈曲行为,讨论了铺层顺序等对屈曲及后屈曲行为的影响,在此基础上提出扁球壳体的格栅加筋方案并进行优化设计。结果表明,该格栅加筋方案可有效提高此类结构的抗屈曲能力,可供飞机结构中复合材料后压力框等类似部件的设计参考。

In the paper,the buckling and post-buckling response of the composite shallow spherical shell under external pressure was obtained by using the nonlinear finite element method.The effects of ply sequence,geometric parameters and boundary conditions on the buckling and post-buckling response were discussed.Then the stiffened composite spherical shell structure was simulated.Based on the analyses of longitudinal and latitudinal stiffened structure,an optimized grid stiffened structure was carried out.The results show that the grid stiffener effectively improves the anti-buckling ability of the spherical shell structure.The method and conclusions provided in the paper can be useful for the design of aircraft spherical components such as the rear pressure bulkhead.