Grid-pattern optimization framework of novel hierarchical stiffened shells allowing for imperfection sensitivity

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• 作者：Bo Wang^a ; Kuo Tian^a ; Caihua Zhou^a ; Peng Hao^a ; ^{haopeng@dlut.edu.cn} ; Yanbing Zheng^a ; Yunlong Ma^b ; Jiebing Wang^c
• 关键词：Hierarchical stiffened shell ; Imperfection sensitivity ; Asymptotic homogenization method ; Buckling ; Grid-pattern optimization
• 刊名：Aerospace Science and Technology
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：62
• 期：Complete
• 页码：114-121
• 全文大小：3191 K
• 卷排序：62

文摘

Influenced by numerous local features, the post-buckling analysis and optimization for hierarchical stiffened shells suffer from heavy computational costs. By smearing the minor stiffeners based on a novel numerical implementation of asymptotic homogenization (NIAH) method, a novel hybrid model for hierarchical stiffened shells is presented. Then, the high prediction accuracy and efficiency of the hybrid model for post-buckling analysis and imperfection sensitivity analysis are validated. Furthermore, a grid-pattern optimization framework of novel hierarchical stiffened shells allowing for imperfection sensitivity is established. The illustrative examples indicate that, the hierarchical stiffened shell with candidate sub-structures is more competitive in load-carrying capacity than that with the fixed grid-pattern, and the presence of imperfections would greatly affect the results of grid-pattern optimizations.