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Buckling of composite panels: A criterion for optimum stiffener design |
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| Authors: | P. Weißgraeber C. Mittelstedt W. Becker |
| Affiliation: | 1. Technische Universität Darmstadt, Fachgebiet Strukturmechanik, Hochschulstraße 1, D-64289 Darmstadt, Germany;2. ELAN GmbH, Team Methods and Tools, Karnapp 25, D-21079 Hamburg, Germany;1. University of Cincinnati, Dept of Aerospace Engineering, Cincinnati, OH 45221-0070, USA;2. Engineering & Scientific Innovations, Inc, 4976 Provident Drive, Cincinnati, OH 45246, USA;1. SP Wood Technology, SP Technical Research Institute of Sweden, Box 5609, Drottning Kristinas väg 67, SE-114 86 Stockholm, Sweden;2. Kebony AS Hoffsveien 48, N-0377 Oslo, Norway;3. Wood Technology, SP Technical Research Institute of Sweden, Box 857, 501 15 Borås, Sweden;1. Nuclear Engineering, Missouri University of Science and Technology (Missouri S&T), Rolla, MO 65409, United States;2. Chemical and Biochemical Engineering, Missouri University of Science and Technology (Missouri S&T), Rolla, MO 65409, United States |
| Abstract: | In this paper a linear, closed-form analysis of the buckling behavior of an orthotropic plate with elastic clamping and edge reinforcement under uniform compressive load is presented. This is a typical structural situation found in aerospace engineering for instance as stiffeners in wings or the fuselage. All governing equations are transformed in a dimensionless system using common characteristic quantities to gain good analytical access. The buckling behavior is analyzed and generic buckling diagrams are presented. The solutions show excellent agreement with results from literature and numerical analyses.The minimum bending stiffness of the edge reinforcement needed to withstand buckling is examined and a minimum stiffness criterion is presented. Furthermore an absolute minimum bending stiffness is found which is sufficient to enable the reinforcement to act as a near-rigid support for arbitrarily long plates. These criteria are of interest for optimized lightweight design of stringers and stiffeners. |
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