Prebuckling and buckling of unsymmetrically laminated composite panels with stringer run-outs

Enzo Cosentino, Paul Weaver

Research output: Contribution to journalArticlepeer-review

Abstract

A meshless approach is developed and used to predict buckling loads of discretely assembled composite panels made from skin and stiffeners. Particular emphasis is given to stringer run-outs within a stiffened panel, where abrupt eccentricity can trigger very large transverse displacements of the skin in front of the run-out tip and perturb the internal in-plane loads distribution. The effect of load eccentricity is included in the formulation. The final set of nonlinear equations is obtained by combining von Ka´rma´n's formulation for moderately large deflections in plates with an extended Timoshenko approach for small initial perturbations. Solutions are calculated by means of a Rayleigh-Ritz method in conjunction with a Galerkin technique. Orthogonal eigenfunctions are employed to expand the variables of interest in generalized Fourier series. An iterative algorithm is proposed to calculate buckling loads. Limits of applicability, convergence of results, and further potential exploitations are discussed. Numerical results are compared with those from finite element analysis and other numerical approaches.

Original languageEnglish
Pages (from-to)2284-2297
Number of pages14
JournalAIAA Journal
Volume47
Issue number10
DOIs
Publication statusPublished - Oct 2009
Externally publishedYes

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