Probabilistic design of axially compressed composite cylinders with geometric and loading imperfections

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Authors

  • Benedikt Kriegesmann
  • Raimund Rolfes
  • Christian HÜhne
  • Jan Teßmer
  • Johann Arbocz

Research Organisations

External Research Organisations

  • Delft University of Technology
  • German Aerospace Center (DLR) (e.V.) Location Braunschweig
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Details

Original languageEnglish
Pages (from-to)623-644
Number of pages22
JournalInternational Journal of Structural Stability and Dynamics
Volume10
Issue number4
Publication statusPublished - Oct 2010

Abstract

The discrepancy between the analytically determined buckling load of perfect cylindrical shells and experimental test results is traced back to imperfections. The most frequently used guideline for design of cylindrical shells, NASA SP-8007, proposes a deterministic calculation of a knockdown factor with respect to the ratio of radius and wall thickness, which turned out to be very conservative in numerous cases and which is not intended for composite shells. In order to determine a lower bound for the buckling load of an arbitrary type of shell, probabilistic design methods have been developed. Measured imperfection patterns are described using double Fourier series, whereas the Fourier coefficients characterize the scattering of geometry. In this paper, probabilistic analyses of buckling loads are performed regarding Fourier coefficients as random variables. A nonlinear finite element model is used to determine buckling loads, and Monte Carlo simulations are executed. The probabilistic approach is used for a set of six similarly manufactured composite shells. The results indicate that not only geometric but also nontraditional imperfections like loading imperfections have to be considered for obtaining a reliable lower limit of the buckling load. Finally, further Monte Carlo simulations are executed including traditional as well as loading imperfections, and lower bounds of buckling loads are obtained, which are less conservative than NASA SP-8007.

Keywords

    Buckling, cylindrical shells, imperfection, probabilistic, robust design

ASJC Scopus subject areas

Cite this

Probabilistic design of axially compressed composite cylinders with geometric and loading imperfections. / Kriegesmann, Benedikt; Rolfes, Raimund; HÜhne, Christian et al.
In: International Journal of Structural Stability and Dynamics, Vol. 10, No. 4, 10.2010, p. 623-644.

Research output: Contribution to journalArticleResearchpeer review

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