Modelling the transverse viscoelasticity of green wood using a combination of two parabolic elements

Sandrine Bardet; Joseph Gril

doi:10.1016/S1631-0721(02)01503-6

Modelling the transverse viscoelasticity of green wood using a combination of two parabolic elements
[Modélisation de la viscoélasticité transverse du bois vert à l'aide d'une combinaison de deux éléments paraboliques]

Sandrine Bardet ¹ ; Joseph Gril ¹

¹ Laboratoire de mécanique et génie civil, Équipe Bois, Université Montpellier 2, CC081, place E. Bataillon, 34095 Montpellier cedex 5, France

Comptes Rendus. Mécanique, Volume 330 (2002) no. 8, pp. 549-556.

Résumé
Abstract

Le module de rigidité en compression radiale a été mesuré à différents niveaux de température et de vitesse de sollicitation sur des échantillons de Boco à l'état vert. La chute importante du module autour de $60^{\circ}$ C est attribuée à la transition vitreuse des lignines. La représentation des résultats expérimentaux dans un plan complexe approché fait apparaı̂tre un deuxième mécanisme viscoélastique à basse température. Un modèle biparabolique permet d'interpréter les résultats. Chaque élément parabolique est remplacé par un modèle de Maxwell généralisé avec spectre quasi-gaussien des rigidités. Ce modèle représente correctement le comportement du bois observé expérimentalement pour une plage de temps comprise entre 0,05 s et 50 s et pour une température comprise entre 10 et $90^{\circ}$ C.

The rigidity in radial compression at different levels of temperature and strain rate have been measured on green Boco, with a drastic softening around $60^{\circ}$ C attributed to the glassy transition of lignin. The representation of experimental results in an approximated complex diagram revealed a secondary viscoelastic process occurring at lower temperature. A multiparabolic model was used for the analysis. For convenience, each parabolic element was replaced by a generalised Maxwell model with a modified-Gaussian relaxation spectrum. This model fitted correctly the observed behaviour of wood in the time range of 0.05 to 50 sec and temperature between 10 to $90^{\circ}$ C.

Reçu le : 2002-04-22
Accepté le : 2002-06-03
Publié le : 2002-01-01

DOI : 10.1016/S1631-0721(02)01503-6

Keywords: rheology, wood, viscoelasticity, compression tests, temperature, modelling
Mots-clés : rhéologie, bois, viscoélasticité, essais de compression, température, modélisation

Affiliations des auteurs :

Sandrine Bardet ¹ ; Joseph Gril ¹

¹ Laboratoire de mécanique et génie civil, Équipe Bois, Université Montpellier 2, CC081, place E. Bataillon, 34095 Montpellier cedex 5, France

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Sandrine Bardet; Joseph Gril. Modelling the transverse viscoelasticity of green wood using a combination of two parabolic elements. Comptes Rendus. Mécanique, Volume 330 (2002) no. 8, pp. 549-556. doi : 10.1016/S1631-0721(02)01503-6. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/S1631-0721(02)01503-6/

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