Mechanical behavior of glass/epoxy tubes under combined static loading. Part I: Experimental |
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| Authors: | Alexandros E Antoniou Christoph Kensche Theodore P Philippidis |
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| Affiliation: | aDepartment of Mechanical Engineering and Aeronautics, University of Patras, P.O. Box 1401, GR 26504 Panepistimioupolis, Rio, Greece;bHexion Specialty Chemicals Stuttgart GmbH, Am Ostkai 21/22, D-70327 Stuttgart, Germany |
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| Abstract: | A series of biaxial static tests of E-glass/epoxy tubular specimens ±45]2, subjected to combined torsion and tension/compression were performed to simulate complex stress states encountered in a wind turbine rotor blade. The failure locus in the effective axial-shear stress plane was derived experimentally while in-plane strain tensor components were measured in the tube outer surface. By means of shell theory and strain measurements in the surface of the specimen, the in-plane shear response of the outer ply was obtained, revealing dependence each time to the combined tube loading. The correlation established between the ratio of transverse normal and in-plane shear stress in the principal coordinate ply system and the elastic shear modulus, suggested a strong dependence, warning on the implications for design and certification procedures. |
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| Keywords: | B Strength B Non-linear behavior B Stress/strain curves C Elastic properties Biaxial testing |
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