Anisotropy of wood vibrational properties: dependence on grain angle and review of literature data |
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| Authors: | Iris Brémaud Joseph Gril Bernard Thibaut |
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| Institution: | 1.Laboratoire de Mécanique et Génie Civil,Université Montpellier 2, CNRS,Montpellier, Cedex 5,France;2.Laboratory of Forest Resources Circulatory System, Graduate School of Life and Environmental Sciences,Kyoto Prefectural University,Kyoto,Japan;3.CNRS- UMR Ecologie des Forêts de Guyane,Kourou,France |
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| Abstract: | The anisotropy of vibrational properties influences the acoustic behaviour of wooden pieces and their dependence on grain
angle (GA). As most pieces of wood include some GA, either for technological reasons or due to grain deviations inside trunks,
predicting its repercussions would be useful. This paper aims at evaluating the variability in the anisotropy of wood vibrational
properties and analysing resulting trends as a function of orientation. GA dependence is described by a model based on transformation
formulas applied to complex compliances, and literature data on anisotropic vibrational properties are reviewed. Ranges of
variability, as well as representative sets of viscoelastic anisotropic parameters, are defined for mean hardwoods and softwoods
and for contrasted wood types. GA-dependence calculations are in close agreement with published experimental results and allow
comparing the sensitivity of different woods to GA. Calculated trends in damping coefficient (tanδ) and in specific modulus
of elasticity (E′/ρ) allow reconstructing the general tanδ-E′/ρ statistical relationships previously reported. Trends for woods with different mechanical parameters merge into a single
curve if anisotropic ratios (both elastic and of damping) are correlated between them, and with axial properties, as is indicated
by the collected data. On the other hand, varying damping coefficient independently results in parallel curves, which coincide
with observations on chemically modified woods, either “artificially”, or by natural extractives. |
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