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Photograph supplied by Michael Nemeth, NASA Langley Research Center, Hampton, Virginia
From "Bending tests of large-diameter stiffened cylinders susceptible to general instability", NASA TN D-2200, April 1964 by Michael F. Card
SUMMARY:
Seven ring-and-stringer stiffened circular cylinders were loaded to failure in bending. At low loadings portions of the skin in each of the cylinders buckled locally; the overall load distribution in the cylinders, however, could be predicted analytically up to failure. Failure of all but one of the cylinders is believed to have been precipitated by general instability. Correlation between orthotropic buckling theory and experiment was found to be fairly good, discrepancies being attributed mainly to uncertainties in two of the orthotropic stiffnesses. Efficient weight-strength capabilities of the test cylinder configuration for lightly loaded missile or aircraft applications are indicated.
The aluminum cylindrical shell has external stringers and internal rings. This specimen has buckled locally (between adjacent stringers and rings) as well as generally (buckling over a region that includes several stringers and rings).
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