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Evidence and modelling of physical aging in green wood |
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| Authors: | Jana Dlouhá Joseph Gril Bruno Clair Tancrède Alméras | ||
| Institution: | (1) Laboratoire de Mécanique et Génie Civil (LMGC), Université Montpellier 2, CNRS UMR-508, cc 048–Place Eugène Bataillon, 34095 Montpellier Cedex 5, France;(2) Mendel University of Agriculture and Forestry in Brno (MZLU v Brně), ústav nauky o dřevě, Zemědělská 3, Brno, 602 00, Czech Republic | ||
| Abstract: | Physical aging typical of semi-crystalline polymers was evidenced in green (never dried) wood from three tropical hardwood
species. The assumption of uniform aging rate was verified by the construction of master curves from series of tensile creep
tests in the fibre direction, performed at increasing time elapsed after a quench following heating above the glassy transition.
The rheological response during periods of creep small enough to neglect the progress of aging was described by a model made
of a spring in series with a parabolic dash-pot where only the characteristic time depends on the aging time. The model was
able to describe results obtained by a previous author on softwood loaded transversally to the fibres. The possible role of
a transient adsorption process consecutive to the quench is discussed.
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| Keywords: | Physical aging Creep Green wood | ||
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