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Cantilever experimental setup for rheological parameter identification in relation to wood drying

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Abstract

Wood exhibits a pronounced time dependent deformation behavior which is usually split into ‘viscoelastic’ creep at constant moisture content (MC) and ‘mechano-sorptive’ creep in varying MC conditions. Experimental determination of model rheological parameters on a material level remains a serious challenge, and diversity of experimental methods makes published results difficult to compare. In this study, a cantilever experimental setup is proposed for creep tests because of its close analogy with the mechanical behavior of wood during drying. Creep measurements were conducted at different load levels (LL) under controlled temperature and humidity conditions. Radial specimens of white spruce wood [Picea glauca (Moench.) Voss.] with dimensions of 110 mm in length (R), 25 mm in width (T), and 7 mm in thickness (L) were used. The influence of LL and MC on creep behavior of wood was exhibited. In constant MC conditions, no significant difference was observed between creep of tensile and compressive faces of wood cantilever. For load not greater than 50% of the ultimate load, the material exhibited a linear viscoelastic creep behavior at the three equilibrium moisture contents considered in the study. The mechano-sorptive creep after the first sorption phase was several times greater than creep at constant moisture conditions. Experimental data were fitted with numerical simulation of the global rheological model developed by authors for rheological parameter identification.

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Acknowledgments

The authors are grateful for the financial support of this research from Natural Sciences and Engineering Research Council of Canada (No. 224297) and Forintek Canada Corp.

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Authors and Affiliations

  1. Département des Sciences du Bois et de la Forêt, Centre de Recherche sur le Bois (CRB), Université Laval, Quebec, QC, G1V 0A6, Canada

    Mohssine Moutee, Yves Fortin & Aziz Laghdir

  2. Département de Génie Civil, Université Laval, Quebec, QC, G1V 0A6, Canada

    Mario Fafard

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  1. Mohssine Moutee
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  2. Yves Fortin
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  3. Aziz Laghdir
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  4. Mario Fafard
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Correspondence to Yves Fortin.

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Moutee, M., Fortin, Y., Laghdir, A. et al. Cantilever experimental setup for rheological parameter identification in relation to wood drying. Wood Sci Technol 44, 31–49 (2010). https://doi.org/10.1007/s00226-009-0274-1

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  • DOI: https://doi.org/10.1007/s00226-009-0274-1

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