Buckling of Axially Compressed Stringer Stiffened Cylindrical Shells with and without Cutouts.

摘要

The effects of stringer eccentricity, shell length, cutouts, and boundary conditions are studied for cylindrical shells under axial compression. Four generalized simple support and four clamped boundary conditions are considered. Buckling loads are determined through the STAGS computer code with its linear bifuration branch and smeared stringer theory. Linear prebuckling deformations and stresses as well as eccentric loading are considered in this study. STAGS incorporates an energy formulation and a finite difference technique. Results of the present theory when compared to linear classical theory show that a rigorous prebuckling analysis has a significant influence on the analysis of stringer stiffened cylinders. It was found that cutouts do not significantly change a stringer stiffened shell's sensitivity to in-plane boundary conditions but cutouts cause a substantial reduction in critical loads for externally stiffened shells. The detrimental effects of cutouts are less apparent in cylindrical shells with internal stringers. The u = O axial restraint is the most important factor in buckling of axially compressed stringer stiffened cylinders. (Author)