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Effects of fungal decay on elasticity and damping of small-diameter silver fir logs assessed by the vibrational resonant method

Barré Jean-Baptiste, Bourrier Franck, Brancheriau Loïc, Bertrand David, Rey Freddy. 2018. Effects of fungal decay on elasticity and damping of small-diameter silver fir logs assessed by the vibrational resonant method. Wood Science and Technology, 52 (2) : pp. 403-420.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
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Quartile : Q1, Sujet : MATERIALS SCIENCE, PAPER & WOOD / Quartile : Q2, Sujet : FORESTRY

Abstract : A number of studies have shown the ability of the vibration resonant method (VRM) to measure the modulus of elasticity (MOE) and the damping ratio (ξ) of calibrated wooden samples of various dimensions. This method based on free transverse vibrations was also studied to assess the decay extent in small stakes. Nevertheless, a need for investigations was identified in order to apply the method to decayed logs. Both decay and geometrical singularities brought heterogeneity not taken into account by the VRM. The aim of this study was to examine the effects of fungal decay on these two mechanical properties of small-diameter silver fir logs using the VRM. Fifty-five small-diameter logs were monitored over a decay process taking place in a greenhouse located near Grenoble (France). The MOE and ξ were measured in intact and decayed states. The results showed the reliability of the measurements of both properties. ξ was found to be independent of moisture content for wood above the fibre saturation point. The results validated the loss in MOE and the gain in ξ due to fungal activity. Thus, indicators based on the MOE and ξ were proposed and compared to quantify the decay extent. Indicators calculated from the first mode of vibration appeared to be relevant for that purpose. Future work is needed to validate indicators on structural size logs and to compare this quantitative assessment to those obtained by the standard EN 152 that currently serves as a benchmark. (Résumé d'auteur)

Mots-clés Agrovoc : Larix, Pinus, Pseudotsuga menziesii, Abies alba, Propriété mécanique, Propriété physicochimique, Bois, Grume de sciage, Élasticité, Carie du bois, Champignon pathogène, Propriété acoustique, Vibration, Altitude, Montagne

Mots-clés géographiques Agrovoc : France, Alpes

Mots-clés complémentaires : Module d'élasticité

Mots-clés libres : Decayed wood, Damping ratio, Dynamic modulus of elasticity, Modal analysis

Classification Agris : K50 - Processing of forest products
J12 - Handling, transport, storage and protection of forest products

Champ stratégique Cirad : Axe 2 (2014-2018) - Valorisation de la biomasse

Auteurs et affiliations

  • Barré Jean-Baptiste, IRSTEA (FRA) - auteur correspondant
  • Bourrier Franck, IRSTEA (FRA)
  • Brancheriau Loïc, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0002-9580-7696
  • Bertrand David, INSA de Lyon (FRA)
  • Rey Freddy, IRSTEA (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/586351/)

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