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<title lang=en>Changes in viscoelastic vibrational properties between compression and normal wood : roles of microfibril angle and of lignin</title>
<creator>Brémaud, Iris</creator>
<creator>Ruelle, Julien</creator>
<creator>Thibaut, Anne</creator>
<creator>Thibaut, Bernard</creator>
<contributor>Mécanique de l'Arbre et du Bois (MAB) ; Laboratoire de Mécanique et Génie Civil (LMGC) ; Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Ecologie des forêts de Guyane (ECOFOG) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD) - Institut National de la Recherche Agronomique (INRA) - Université des Antilles et de la Guyane (UAG) - AgroParisTech - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Production et valorisation des bois tropicaux (Bois tropicaux) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD)</contributor>
<description>International audience</description>
<source>ISSN: 0018-3830</source>
<source>EISSN: 1437-434X</source>
<source>Holzforschung</source>
<publisher>De Gruyter</publisher>
<identifier>hal-00808062</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00808062</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00808062/document</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00808062/file/Changes_viscoelastic_vibrational_Bremaud_al.pdf</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00808062</source>
<source>Holzforschung, De Gruyter, 2013, pp.voir DOI. 〈10.1515/hf-2011-0186〉</source>
<identifier>DOI : 10.1515/hf-2011-0186</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1515/hf-2011-0186</relation>
<language>en</language>
<subject lang=en>Viscoelastic vibrational properties</subject>
<subject lang=en>Compression wood</subject>
<subject lang=en>Damping coefficient</subject>
<subject lang=en>FT-IR</subject>
<subject lang=en>Lignin</subject>
<subject lang=en>Internal friction</subject>
<subject lang=en>Microfibril angle (MFA)</subject>
<subject lang=en>Picea abies</subject>
<subject lang=en>Pinus pinaster</subject>
<subject lang=en>Pinus sylvestris</subject>
<subject lang=en>Specific dynamic modulus of elasticity</subject>
<subject lang=en>Viscoelastic vibrational properties.</subject>
<subject>[SPI.MAT] Engineering Sciences [physics]/Materials</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>This study aims at better understanding the respective influences of specific gravity (γ), microfibril angle (MFA), and cell-wall matrix polymers on viscoelastic vibrational properties of wood in axial direction. The wide variations of properties between normal wood (NW) and compression wood (CW) are in focus. Three young bent trees (Picea abies, Pinus sylvestris and Pinus pinaster) that recovered verticality were sampled. Several observed differences between NW and CW were highly significant in terms of anatomical, physical (γ, shrinkage, CIELab colorimetry), mechanical (compressive strength), and vibrational properties. Specific dynamic modulus of elasticity (E'/γ) decreases with increasing MFA, and Young's modulus (E') can be satisfactorily explained by γ and MFA. Apparently, the type of the cell wall polymer matrix is not influential in this regard. The damping coefficient (tanδ) does not depend solely on MFA of NW and CW. The tanδ - E'/γ relationship evidences that, at equivalent E'/γ, the tanδ of CW is approx. 34% lower than that of NW. This observation is ascribed to the more condensed nature of CW lignins, and this is discussed in the context of previous findings in other hygrothermal and time/frequency domains. It is proposed that the lignin structure and the amount and type of extractives, which are both different in various species, are partly responsible for taxonomy-related damping characteristics.</description>
<date>2013</date>
</dc>
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