The behaviour of damage tolerant hat-stiffened composite panels loaded in uniaxial compression

被引:32
作者
Falzon, BG [1 ]
机构
[1] Univ London Imperial Coll Sci Technol & Med, Dept Aeronaut, London SW7 2BY, England
关键词
postbuckling; finite element analysis (FEA);
D O I
10.1016/S1359-835X(01)00074-4
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Damage tolerant hat-stiffened thin-skinned composite panels with and without a centrally located circular cutout, under uniaxial compression loading, were investigated experimentally and analytically. These panels incorporated a highly postbuckling design characterised by two integral stiffeners separated by a large skin bay with a high width to skin-thickness ratio. In both configurations, the skin initially buckled into three half-wavelengths and underwent two mode-shape changes; the first a gradual mode change characterised by a central deformation with double curvature and the second a dynamic snap to five half-wavelengths. The use of standard path-following non-linear finite element analysis did not consistently capture the dynamic mode change and an approximate solution for the prediction of mode-changes using a Marguerre-type Rayleigh-Ritz energy method is presented. Shortcomings with both methods of analysis are discussed and improvements suggested. The panels failed catastrophically and their strength was limited by the local buckling strength of the hat stiffeners. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1255 / 1262
页数:8
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