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论文类型：期刊论文

发表时间：2017-07-03

发表刊物：ENGINEERING OPTIMIZATION

收录刊物：SCIE、EI、Scopus

卷号：49

期号：7

页面范围：1116-1132

ISSN号：0305-215X

关键字：Stiffened shell; cutouts; simultaneous buckling; curvilinear stiffener; optimization

摘要：Buckling is usually initiated from a local region near the cutout for cylindrical stiffened shells under axial compression, and then the evolution of buckling waves is governed by the combined effects of local and global stiffness, which limit the load-carrying capacity. Therefore, a simultaneous buckling pattern is crucial for improving the structural efficiency. In this study, a multi-step optimization strategy for the integrated design of near and far fields away from cutouts is proposed, and the convergence criterion of buckling optimization is improved as a deformation-based index. The numerical implementation of the asymptotic homogenization method is utilized to construct an efficient finite element model for post-buckling analysis. A 5m diameter stiffened shell in a launch vehicle demonstrates that the proposed framework can provide a simultaneous buckling design with high structural efficiency in an efficient manner. Both the buckling deformations and stress of the optimum design are more uniform compared to other optimum designs.