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Wood Research and Technology


Cellulose – Hemicelluloses – Lignin – Wood Extractives

Editor-in-Chief: Faix, Oskar / Salmén, Lennart

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Volume 61, Issue 5


Novel experimental approach for longitudinal-radial stiffness characterisation of clear wood by a single test

José Xavier / Stéphane Avril / Fabrice Pierron / José Morais
Published Online: 2007-08-08 | DOI: https://doi.org/10.1515/HF.2007.083


Experimental results obtained from maritime pine (Pinus pinaster Ait.) wood are presented for the characterisation of all LR=(1,2) orthotropic stiffness parameters of clear wood specimens by a single test. The approach relies on application of the virtual field method (VFM) to a rectangular specimen loaded in the Iosipescu fixture. The displacement field over the gauge surface of the specimen is measured by the grid method. Two configurations are investigated: (1) with grain aligned along the specimen length (0° configuration) and (2) with grain at 45°. For the 0° configuration, only the parameters Q 11 and Q 66 are correctly identified, with coefficients of variation of the same order of magnitude as those obtained from reference tensile and shear tests. Better identification is obtained for the 45° configuration, for which only the parameter Q 12 exhibits large scatter. This improvement results from a more balanced influence of all stiffness parameters on the response of the 45° specimen. However, all stiffness parameters identified were systematically underestimated by approximately 30% in comparison to reference values. This deviation is due to the vertical spatial variation of the mechanical properties of wood within the stem. Literature data confirm this interpretation.

Keywords: full-field measurements; material characterisation; statically undetermined test; virtual fields method (VFM)

About the article

Corresponding author. LMPF/ENSAM, Rue Saint-Dominique BP 508, 51006 Châlons-en-Champagne Cedex, France

Received: 2006-11-28

Accepted: 2007-04-24

Published Online: 2007-08-08

Published in Print: 2007-08-01

Citation Information: Holzforschung, Volume 61, Issue 5, Pages 573–581, ISSN (Online) 1437434X, ISSN (Print) 00183830, DOI: https://doi.org/10.1515/HF.2007.083.

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