Indexed by:期刊论文

Date of Publication:2014-09-01

Journal:THIN-WALLED STRUCTURES

Included Journals:SCIE、EI

Volume:82

Page Number:46-54

ISSN No.:0263-8231

Key Words:Hierarchical stiffened shell; Axial compression; Buckling; Imperfection sensitivity; Hybrid optimization

Abstract:In this study, Smeared Stiffener Method (SSM) of hierarchical stiffened shells is derived to release the prediction burden of buckling loads. Then, a minimum-weight optimization formulation for hierarchical stiffened shells is developed based on SSM, attempting to demonstrate the higher lightweight potential of hierarchical stiffened shells compared to the traditional ones. Further, the main aim of this paper is to present a hybrid optimization framework of hierarchical stiffened shells including imperfection sensitivity, combining the efficiency of SSM with the accuracy of FEM, since there are currently no closed-form solutions to take imperfections into account accurately. The illustrative example demonstrates that the proposed framework has a higher optimization efficiency and global optimization capability compared to the conventional methods. (C) 2014 Elsevier Ltd. All rights reserved.