Abstract
Buckling equations for orthotropic cylindrical shells with eccentric spiral stiffeners were derived through the variation method of the total potential. Loadings analyzed are axial compression, hydrostatic pressure, bending, and torsion. For each loading type, the conventional ring-stiffened, stringer-stiffened, and ring-and-stringer-stiffened cylinders are compared, through a model cylinder, with spiral types on an equal-weight basis and an equalstrength basis. The limited numerical study indicated a possibility that the spiral-type stiffening might be stronger than the corresponding conventional-type stiffening of equal weight and that, in addition, the strength ratio of the two types of cylinder might increase when the amount of stiffening is increased. The merit of placing spiral stiffeners internal or external to the cylinder is also evaluated. Correlation between the present analysis and existing test data for spiral-stiffened waffle cylinders shows good agreement.
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