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Buckled axially compressed externally stringer-stiffened long aluminum cylindrical shell

This and the next several slides show buckling of longitudinally stiffened cylindrical shells.

Photograph supplied by Michael Nemeth, NASA Langley Research Center, Hampton, Virginia

This slide is from Michael F. Card and Robert M. Jones, "Experimental and theoretical results for buckling of eccentrically stiffened cylinders", NASA TN D-3639, October 1966

SUMMARY:
Results from an experimental and theoretical study of the effect of stiffener eccentricity (one-sidedness) on buckling are reported. In the experimental investigation axial compression tests were conducted on twelve longitudinally stiffened cylinders which represent six configurations with internal or external integral or Z-stiffeners. For certain configurations externally stiffened cylinders were found to carry over twice the load sustained by their internally stiffened counterparts. A solution was obtained by a Galerkin procedure for buckling of clamped, eccentrically stiffened, orthotropic cylinders under axial compression, lateral pressure, or hydrostatic pressure. The experimental results for axially loaded cylinders range from 70 to 95 per cent of the corresponding theoretical predicitons. However, it is concluded from the comparison that a membrane prebuckled shape is sufficient for assessment of eccentricity effects. Furthermore, comparison of solutions for clamped and simply supported cylinders with the test data and with previous theoretical results reveals that edge clamping has a significant effect.

There appears to be two axial half-waves in the general buckling pattern shown in this slide.

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