کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
279228 | 1430317 | 2010 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Knockdown factors for buckling of cylindrical and spherical shells subject to reduced biaxial membrane stress Knockdown factors for buckling of cylindrical and spherical shells subject to reduced biaxial membrane stress](/preview/png/279228.png)
Cylindrical shells under uniaxial compression and spherical shells under equi-biaxial compression display the most extreme buckling sensitivity to imperfections. In engineering practice, the reduction of load carrying capacity due to imperfections is usually addressed by use of a knockdown factor to lower the critical buckling stress estimated or computed without accounting for imperfections. For thin elastic cylindrical shells under uniaxial compression and spherical shells under equi-biaxial compression, the knockdown factor is typically as small as 0.2. This paper explores the alleviation of imperfection-sensitivity for loadings with a reduced circumferential (transverse) membrane stress component. The analysis of Koiter (1963) on the effect of an axisymmetric imperfection on the elastic buckling of a cylindrical shell under uniaxial compression is extended to both cylinders and spheres for loadings that produce general combinations of biaxial membrane stresses. Increases in the knockdown factor due to a reduction of the transverse membrane component are remarkably similar for cylindrical and spherical shells.
Journal: International Journal of Solids and Structures - Volume 47, Issue 10, 15 May 2010, Pages 1443–1448