RELIABILITY–BASED DESIGN OPTIMIZATION: AN APPLICATION TO THE BUCKLING OF IMPERFECT SHELLS


Abstract eng:
Discrepancies observed in experimental buckling loads of thin shells are often due to the random nature of initial shape imperfections, material properties and non-perfect boundary conditions. The work presented in this paper aims at finding the optimal dimensions of a single bay of a ring-stiffened cylinder representative of a submarine pressure hull under external hydrostatic pressure. It accounts for uncertainties of material properties and amplitudes of imperfections, supposed distributed over the two most critical buckling modes in a first simplified approach (overall and interframe buckling modes). The Reliability-Based Design Optimization problem considered here consists in finding an optimal deterministic design minimizing the weight of the structure while meeting a prescribed safety level. The present work hinges on closed-form / semi-numerical solutions for the buckling problems in a first approach. FORM reliability results based on a 3D shell finite element model are presented in a second part, in an effort to base such a design optimization on a more accurate mechanical model and to provide a sound basis for the optimal design of structures prone to buckling.

Contributors:
Publisher:
ASRANet Ltd., 2008
Conference Title:
Conference Title:
4th International ASRANet Colloquium
Conference Venue:
Athens (GR)
Conference Dates:
2008-06-25 / 2008-06-27
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2014-11-20, last modified 2014-11-20


Original version of the author's contribution as presented on CD, paper No. 71.:
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