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Characterization of viscoelastic, shrinkage and transverse anatomy properties of four Australian hardwood species.

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Title: Characterization of viscoelastic, shrinkage and transverse anatomy properties of four Australian hardwood species.
Authors: Redman, Adam L.1, Bailleres, Henri2, Perre, Patrick3
Source: Wood Material Science & Engineering. Sep2011, Vol. 6 Issue 3, p95-104. 10p.
Subjects: Hardwoods, Viscoelasticity, Eucalyptus pilularis, Jarrah, Wood, Mechanical behavior of materials, Electron microscopy
Geographic Terms: France
Abstract: Several key wood properties of four Australian hardwood species: Corymbia citriodora, Eucalyptus pilularis, Eucalyptus marginata and Eucalyptus obliqua, were characterized using state-of-the-art equipment at AgroParisTech, ENGREF, France. The wood properties were measured for input into microscopic (cellular level) and macroscopic (board level) vacuum-drying models currently under development. Morphological characterization was completed using a combination of environmental scanning electron microscopy and image analysis software. A clear difference in fibre porosity, size, wall thickness and orientation was evident between species. Viscoelastic properties were measured in the tangential and radial directions using dynamic mechanical analysis instrumentation. The glass transition temperature was markedly different for each species owing to anatomical and chemical variations. The radial direction showed higher stiffness, internal friction and glass transition temperature than the tangential direction. A highly sensitive microbalance and laser technology were used to measure loss of moisture content in conjunction with directional shrinkage on microsamples. Collapse shrinkage was clearly evident with this method for E. obliqua, but not with other species, consistent with industrial seasoning experience. To characterize the wood-water relations of E. obliqua, free of collapse, thinner sample sections (in the radial-tangential plane) are recommended. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Several key wood properties of four Australian hardwood species: Corymbia citriodora, Eucalyptus pilularis, Eucalyptus marginata and Eucalyptus obliqua, were characterized using state-of-the-art equipment at AgroParisTech, ENGREF, France. The wood properties were measured for input into microscopic (cellular level) and macroscopic (board level) vacuum-drying models currently under development. Morphological characterization was completed using a combination of environmental scanning electron microscopy and image analysis software. A clear difference in fibre porosity, size, wall thickness and orientation was evident between species. Viscoelastic properties were measured in the tangential and radial directions using dynamic mechanical analysis instrumentation. The glass transition temperature was markedly different for each species owing to anatomical and chemical variations. The radial direction showed higher stiffness, internal friction and glass transition temperature than the tangential direction. A highly sensitive microbalance and laser technology were used to measure loss of moisture content in conjunction with directional shrinkage on microsamples. Collapse shrinkage was clearly evident with this method for E. obliqua, but not with other species, consistent with industrial seasoning experience. To characterize the wood-water relations of E. obliqua, free of collapse, thinner sample sections (in the radial-tangential plane) are recommended. [ABSTRACT FROM AUTHOR]
ISSN:17480272
DOI:10.1080/17480272.2010.535014