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Nonlinear Analysis of Stiffened Laminated Cylindrical Shells Using the Layerwise Theory of Reddy

by M. Savoia, Universita di Bologna, Bologna, Italy,
J. N. Reddy, Universita di Bologna, Bologna, Italy,



Document Type: Proceeding Paper

Part of: Engineering, Construction, and Operations in Space IV

Abstract:

The layerwise shell theory of Reddy is used to develop the buckling and the postbuckling equations of circular cylindrical shells reinforced by means of axial and ring stiffeners and subject to mechanical and thermal loads. The `smeared technique' is used for the stiffeners, and the Rayleigh-Ritz method is used to reduce the continuum problem to a set of nonlinear algebraic equations, which are solved using the Riks-Wempner iterative technique. Numerical results for stiffened and unstiffened cylinders are presented, showing that imperfection-sensitivity is strictly related to the number of nearly simultaneous buckling modes.

Subject Headings: Stiffening | Shell structures | Structural analysis | Laminated materials | Composite structures | Sensitivity analysis | Nonlinear analysis

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