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Buckling of axially compressed cylindrical shells with local imperfections


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Krishnakumar, S 1988 , 'Buckling of axially compressed cylindrical shells with local imperfections', PhD thesis, University of Tasmania.

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Thin cylindrical shells in axial compression are known to be
highly sensitive to geometric imperfections. Previous theoretical and
experimental investigations have mostly concentrated on imperfections
of small amplitude extending over the whole surface or at least over
the whole circumference of the cylinder. Local imperfections occurring
naturally are often found to be similar in form to the diamond-shaped
facets of the buckle pattern of the collapsed cylinder. The current
study is aimed at investigating experimentally the effect of such
facet-shaped dimples on the load bearing capacity of the axially
loaded circular cylindrical shell and evaluating the applicability of
the space frame theory in predicting the same.
The space frame theory predicts the secondary collapses
observed in cylindrical shells under axial compression in terms of the
buckling strengths of the diagonal members of an equivalent space
frame having the geometry of the Yoshimura pattern. The proposed
application of the space frame model to estimate the load carrying
capacity of shells with diamond-shaped defects is based on the
hypothesis that the effect of such a defect is similar to that of a
facet of the same size in a buckled cylinder. Central to this model is
the effective width of the flanges of the diagonal members of the
space frame. In the present work modifications are introduced in the
space frame theory to accommodate an analytical determination of the
effective width of the flanges. Geometric constraints on the buckled
configuration of the axially loaded cylinder are also investigated.

Item Type: Thesis - PhD
Authors/Creators:Krishnakumar, S
Keywords: Cylinders, Buckling (Mechanics), Shells (Engineering)
Copyright Holders: The Author
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Thesis (Ph.D.)--University of Tasmania, 1990. Bibliography: leaves 309-317

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