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FROM:
Degenhardt R. (1), Rohwer K. (1), Wagner W. (2), Delsemme J-P. (3)
(1) DLR, Institute of Structural Mechanics, Braunschweig, Germany
(2) University of Karlsruhe(TH), Institut fuer Baustatik, Karlsruhe, Germany
(3) Samtech S. A., Liege, Belgium
"Postbuckling And Collapse Analysis Of CFRP Stringer Stiffened Panels – A Garteur Activity", Fourth International Conference on Thin-Walled Structures ICTWS 2004, 22-24 June 2004
ABSTRACT: In order to identify abilities and deficiencies of available analysis tools as well as to establish recommendations for buckling, post-buckling and collapse analysis of thin-walled aerospace structures the Group for Aeronautical Research and Technology in EURope (GARTEUR) launched a specific Action Group consisting of 10 partners from universities, research establishments and industry out of 7 European nations. These partners identified three different benchmarks with well-documented buckling tests. Then, finite elements tools to simulate the structural behaviour were methodically checked and selected, the benchmark computations were performed, evaluated and recommendations were derived. This paper reports on the results of Benchmark 3, an axially compressed CFRP panel that consists of a skin with nominally cylindrical shape, stiffened by stringers. The stringers were partially separated from the skin by impacting prior to the tests. Finally, the panel was axially compressed until collapse. DLR, the University of Karlsruhe, QinetiQ and Samtech applied different tools to simulate the behaviour of this panel during loading up to collapse. Linear and nonlinear analyses as well as buckling analyses were performed. Specific abilities and deficiencies of the tools considered were evaluated. Finally, based on the experience gained within the project, the partners derived recommendations with respect to the influence of parameters, the initial buckling load, the convergence behaviour, the simulation of load introduction and boundary conditions as well as the imperfection sensitivity.
References listed at the end of the paper:
[1] Degenhardt R., Wagner W., Delsemme J.-P. and David A. (2003), GARTEUR Open, SM AG25, Postbuckling and Collapse Analysis - Benchmark 3 Evaluation Report and Collected Contributions, IB – 131-2003/29, Braunschweig, DLR, 2003
[2] Rolfes, R.; Baaran, J.; Juhasz, J.; Kling, A.; Kuhlmann, G.; Nolden, Ph. (7-12 July 2002), High Performance Tools for Failure, Damage Tolerance and Stability Analysis of Composite Structures, in: Mang, H.A.; Rammerstorfer, F.G.; Eberhardsteiner, J. (Hrsg.): Proceedings of the Fifth World Congress on Computational Mechanics (WCCM V), Wien, ISBN 3-9501554-0-6, http://wccm.tuwien.ac.at
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