Imperfection-insensitive axially loaded thin cylindrical shells

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:62

Article

Ning, Xin¹  Pellegrino, Sergio¹ 

[1] CALTECH, Grad Aerosp Labs, Pasadena, CA 91125 USA

关键词: Shell buckling;    Imperfection-sensitivity;    Corrugated shells;    Structural optimization;    Mass efficiency;    Aster shell;   

DOI  :  10.1016/j.ijsolstr.2014.12.030

来源: Elsevier

【 摘 要 】

The high efficiency of circular monocoque cylindrical shells in carrying axial loads is impaired by their extreme sensitivity to imperfections and there is an extensive body of literature that addresses this behavior. Instead of following this classical path, focused on circular cross-sections, this paper presents a novel approach that adopts optimal symmetry-breaking wavy cross-sections (wavy shells). The avoidance of imperfection sensitivity is achieved by searching with an evolutionary algorithm for smooth cross-sectional shapes that maximize the minimum among the buckling loads of geometrically perfect and imperfect wavy shells. It is found that shells designed through this approach can achieve higher critical stresses and knockdown factors than any previously known monocoque cylindrical shells. It is also found that these shells have superior mass efficiency to almost all previously reported stiffened shells. (C) 2015 Elsevier Ltd. All rights reserved.

【 授权许可】

Free