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This and the next image are from:
K. Athiannan (1) and R Palaninathan (2)
(1) Structural Mechanics Section, Reactor Engineering Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
(2) Department of Applied Mechanics, Indian Institute of Technology – Madras, Chennai 600 036, India
“Experimental investigation on buckling of cylindrical shell under compression and transverse shear”, Sadhana, vol. 29, 2004, Feb., 93-115
ABSTRACT: This paper presents experimental studies on buckling of cylindrical shell models under axial and transverse shear loads. Tests are carried out using an experimental facility specially designed, fabricated and installed, with provision for in-situ measurement of the initial geometric imperfections. The shell models are made by rolling and seam welding process and hence are expected to have imperfections more or less of a kind similar to that of real shell structures. The present work thus differs from most of the earlier investigations. The measured maximum imperfections deltamax are of the order of plus or minus 3t (t = thickness). The buckling loads obtained experimentally are compared with the numerical buckling values obtained through finite element method (FEM). In the case of axial buckling, the imperfect geometry is obtained in four ways and in the case of transverse shear buckling, the FE modelling of imperfect geometry is done in two ways. The initial geometric imperfections affect the load carrying capacity. The load reduction is considerable in the case of axial compression and is marginal in the case of transverse shear buckling. Comparisons between experimental buckling loads under axial compression, reveal that the extent of imperfection, rather than its maximum value, in a specimen influences the failure load. Buckling tests under transverse shear are conducted with and without axial constraints. While differences in experimental loads are seen to exist between the two conditions, the numerical values are almost equal. The buckling modes are different, and the experimentally observed and numerically predicted values are in complete disagreement.
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