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Identification of anisotropic vibrational properties of Padauk wood with interlocked grain

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An Erratum to this article was published on 17 September 2010

Abstract

Grain deviations and high extractives content are common features of many tropical woods. This study aimed at clarifying their respective impact on vibrational properties, referring to African Padauk (Pterocarpus soyauxii Taub.), a species selected for its interlocked grain, high extractives content and uses in xylophones. Specimens were cut parallel to the trunk axis (L), and local variations in grain angle (GA), microfibril angle (MFA), specific Young’s modulus (E′ L /ρ, where ρ stands for the density) and damping coefficient (tanδL) were measured. GA dependence was analysed by a mechanical model which allowed to identify the specific Young’s modulus (E′3/ρ) and shear modulus (G′/ρ) along the grain (3) as well as their corresponding damping coefficients (tanδ3, tanδG). This analysis was done for native and then for extracted wood. Interlocked grain resulted in 0–25° GA and in variations of a factor 2 in E′L/ρ and tanδL. Along the grain, Padauk wood was characterized, when compared to typical hardwoods, by a somewhat lower E′3/ρ and elastic anisotropy (E′/G′), due to a wide microfibril angle plus a small weight effect of extracts, and a very low tanδ3 and moderate damping anisotropy (tanδG/tanδ3). Extraction affected mechanical parameters in the order: tanδ3 ≈ tanδG > G′/ρ > > E′3/ρ. That is, extractives’ effects were nearly isotropic on damping but clearly anisotropic on storage moduli.

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Acknowledgments

We are grateful to Yves ElKaïm, in LMGC, for setting up the interface for vibrational tests, and to Arie Van Der Lee (IEM Montpellier) for his help in XRD measurements. This work has been supported by a Fellowship from Japanese Society for the Promotion of Science.

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Authors and Affiliations

  1. Laboratory of Forest Resource Circulating Circles, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Kyoto, 606-8522, Japan

    Iris Brémaud & Kazuya Minato

  2. Laboratoire de Mécanique et Génie Civil, CNRS - Université Montpellier 2, Place E. Bataillon, cc 048, 34095, Montpellier cedex 5, France

    Iris Brémaud, Pierre Cabrolier, Joseph Gril & Bruno Clair

  3. Tropical and Mediterranean Forest Products, CIRAD, TA B40/16 BP 5035, 34398, Montpellier cedex 5, France

    Jean Gérard

  4. UMR Ecologie des Forêts de Guyane, CNRS, BP 316, 97379, Kourou cedex, French Guyana

    Bernard Thibaut

Authors
  1. Iris Brémaud
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  2. Pierre Cabrolier
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  3. Joseph Gril
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  4. Bruno Clair
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  5. Jean Gérard
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  6. Kazuya Minato
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  7. Bernard Thibaut
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Correspondence to Iris Brémaud.

Additional information

This article is dedicated to Gerd Wegener on the occasion of his retirement as professor at the Technische Universität München.

An erratum to this article can be found at http://dx.doi.org/10.1007/s00226-010-0369-8

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Brémaud, I., Cabrolier, P., Gril, J. et al. Identification of anisotropic vibrational properties of Padauk wood with interlocked grain. Wood Sci Technol 44, 355–367 (2010). https://doi.org/10.1007/s00226-010-0348-0

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