Axial load capacity of cylindrical shells with local geometric defects

The effect of local geometric defects on the buckling load of axially compressed thin circular cylindrical shells is investigated experimentally. Defects, in the form of diamond-shaped local dimples, similar to the buckles of the Yoshimura pattern, were introduced in otherwise near perfect isotropic epoxy shells by locally heating the shell wall. The behavior of the defects under load was monitored optically using a special whole-field grid-reflection technique. The effects of variations in shell geometry and defect size are also investigated. In general, the results indicate that the effect of local diamond-shaped defects on the stability of the axially loaded cylinder is not as detrimental as that of the global initial imperfections hitherto investigated.

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