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研究均布外压作用下具有非均匀特征的碳纤维/环氧树脂复合材料格栅加筋圆锥壳体构型优化。首先,充分考虑复合材料格栅圆锥壳体中格栅非均匀分布造成结构小端材料利用不充分问题,提出变环肋铺设间距的优化分布方式,使格栅在截顶圆锥壳体结构上小端疏大端密。之后,基于考虑格栅非均匀分布及变环肋间距铺设特征的等效刚度模型,并采用最小势能原理得到环肋铺设优化后的格栅加筋圆锥壳体临界载荷值解析式。针对典型锥壳的有限元验证表明解析算法的误差在1%左右,证实了本文提出的分析方法的可靠性和有效性。最后,通过对环肋间距优化圆锥壳体的参数分析,发现优化环肋分布方式可以使格栅加筋锥壳结构的外压稳定性大幅上升。本文研究内容为碳纤维/环氧树脂复合材料格栅加筋圆锥壳体的优化设计提供了一种具有较高承载力的构型,并为此类结构的计算提供了解析算法。
The optimization of the configuration of the stiffened conical shell with carbon fiber / epoxy composite grille with non-uniform characteristics under uniform external pressure was studied. First of all, taking full account of the non-uniform distribution of the grids in the composite grid conical shell, the optimal distribution of the spacing of the variable-ring ribs is proposed, which makes the grid small in the truncated conical shell structure Duan Shu big end dense. After that, based on the equivalent stiffness model considering the non-uniform distribution of grille and the interlacing rib spacing, the analytical formula of the critical load value of the grille-stiffened conic shell with optimized rib ring was obtained by the principle of minimum potential energy. The finite element analysis of a typical conical shell shows that the error of the analytical algorithm is about 1%, which proves the reliability and validity of the analytical method proposed in this paper. Finally, through the analysis of the parameters of the conical shell with optimized rib spacing, it is found that the optimized annular rib distribution can increase the stability of the external pressure of the grid-stiffened conical shell structure. The research content in this paper provides a configuration with higher bearing capacity for the optimal design of carbon fiber / epoxy composite grid stiffened conic shells and provides an analytical algorithm for the calculation of such structures.