Variation of transverse and shear stiffness properties of wood in a tree |
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| Authors: | J. Xavier S. Avril F. Pierron J. Morais |
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| Affiliation: | 1. CITAB/UTAD, Engenharias I, Apartado 1013, 5001-801 Vila Real, Portugal;2. IS, ENSM-SE, 158 cours Fauriel, 42023 Saint-Etienne, France;3. LMPF, Arts et Métiers ParisTech, Rue St. Dominique BP 508, 51000 Châlons-en-Champagne, France;1. I2M – Department of Environmental and Civil Engineering, UMR 5295 (Université de Bordeaux/CNRS), 351 cours de la Libération, Bâtiment A11bis, 33405 Talence Cedex, France;2. ESTIA Recherche, Technopôle Izarbel, 97 allée Théodore Monod, 64210 Bidart, France;1. Polymer Competence Center Leoben GmbH, Leoben, Austria;2. Institute of Lightweight Design and Structural Biomechanics, Vienna University of Technology, Vienna, Austria;1. Institute of Lightweight Design and Structural Biomechanics, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria;2. Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, A-8700 Leoben, Austria;1. LISV, University of Versailles Saint-Quentin, F78035 Versailles, France;2. L3M2S, Lebanese University, Rafic Hariri Campus, Beirut, Lebanon;3. Faculty of Engineering, Lebanese University, Rafic Hariri Campus, Beirut, Lebanon;1. Department of Biomedical Engineering, Lund University, Box 118, SE-221 00 Lund, Sweden;2. Division of Solid Mechanics, Lund University, Box 118, SE-221 00 Lund, Sweden |
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| Abstract: | In this work, the application of the unnotched Iosipescu test for the evaluation of the radial variability of longitudinal–radial stiffness parameters of maritime pine wood was investigated. Rectangular specimens with grain at 45° were tested using the Iosipescu fixture. For this configuration both the transverse (Q22) and the shear (Q66) stiffness parameters can be simultaneously identified by the virtual fields method. Displacement fields were measured by the grid method. The strain fields were reconstructed from the raw displacement fields using a polynomial approximation scheme. For the tested wood material, it was found that both parameters decrease from the centre to about the middle radius of the stem and increase afterwards to the outermost positions. Moreover, a relatively good correlation was obtained between the patterns of radial variability of Q22 and Q66. |
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