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The scatter of test results for uniformly axially compressed cylindrical shells shown in the previous several slides is largely caused by the presence of unavoidable initial imperfections. When the imperfections are measured and the measured imperfections are included in the finite element models, test and theory, especially theory via nonlinear finite element analyses, come into much closer agreement.
This slide is from:
Kirkpatrick SW and Holmes BS (SRI International, Menlo Park, California), “Axial Buckling of a Thin Cylindrical Shell: Experiments and Calculations”, in Computational Experiments ed by WK Liu, P. Smolinski and R. Ohayon, PVP Vol 178, American Soc. of Mechanical Engineers, Book No. H00491, 1989
ABSTRACT: Thin cylindrical shells were tested under axial compression beyond the critical huckling load. Both pretest and posttest finite element calculations were performed to calculate the huckling loads and post- buckling deformations. Finite element simulations of the shell included pretest measured imperfections in shell geometry and asymmetry in the axial load. Results show that the axial collapse load is sensitive to imperfections in both the shell geometry and the load distribution. Careful modeling of the imperfections resulted in accurate predictions of the buckling load and postbuckling deformations for the shells.
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