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Buckling and dynamics of inflatable beams
In this paper the authors present a summary of the behaviour of inflatable fabric structures. Deflections of inflated beams are established by satisfying the following requirements: equilibrium equations must be written in the deformed state (to take into account the following forces due to the internal pressure) and Timoshenko's assumptions must be used to describe the kinematics of the beam. Analytical study on inflatable beams is presented and an inflatable fabric beam finite element used for hyper static systems is described. Comparisons with 3D membrane analysis and beam theory show the accuracy of the beam finite elements. The stiffness matrix takes into account the inflation pressure. Experiments show that one can make an analogy between usual plastic hinges and pneumatic hinges which appear in the shapes of inflatable beams. Shakedown analysis is therefore used to calculate collapse loads of inflatable beams. Analytical study is also used to calculate the buckling loads of beams and critical loads of a cantilever are computed. First results on the dynamic behaviour of inflatable beams are finally displayed. Comparisons between experimental and numerical results prove the accuracy of the shakedown, buckling and finite element analysis for solving problems of inflatable fabric beams.
Buckling and dynamics of inflatable beams
In this paper the authors present a summary of the behaviour of inflatable fabric structures. Deflections of inflated beams are established by satisfying the following requirements: equilibrium equations must be written in the deformed state (to take into account the following forces due to the internal pressure) and Timoshenko's assumptions must be used to describe the kinematics of the beam. Analytical study on inflatable beams is presented and an inflatable fabric beam finite element used for hyper static systems is described. Comparisons with 3D membrane analysis and beam theory show the accuracy of the beam finite elements. The stiffness matrix takes into account the inflation pressure. Experiments show that one can make an analogy between usual plastic hinges and pneumatic hinges which appear in the shapes of inflatable beams. Shakedown analysis is therefore used to calculate collapse loads of inflatable beams. Analytical study is also used to calculate the buckling loads of beams and critical loads of a cantilever are computed. First results on the dynamic behaviour of inflatable beams are finally displayed. Comparisons between experimental and numerical results prove the accuracy of the shakedown, buckling and finite element analysis for solving problems of inflatable fabric beams.
Buckling and dynamics of inflatable beams
Knicken und Dynamik von aufblasbaren Trägern
Wielgosz, Christian (author) / Le Van, Anh (author) / Thomas, Jean- Christophe (author) / Casari, Pascal (author)
2005
10 Seiten, 5 Bilder, 2 Tabellen, 9 Quellen
Conference paper
English
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