1. Variation of transverse and shear stiffness properties of wood in a tree
- Author
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Stéphane Avril, Fabrice Pierron, José Morais, José Xavier, Laboratoire de Mécanique et Procédés de Fabrication (LMPF), Centro de Investigação e de Tecnologias Agro-Ambientais e Biológicas (CITAB), University of Trás-os-Montes and Alto Douro [Portugal] (UTAD), Département Biomécanique et Biomatériaux (DB2M-ENSMSE), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-CIS, Centre Ingénierie et Santé (CIS-ENSMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Plasticité, Endommagement et Corrosion des Matériaux (PECM-ENSMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-SMS-Centre National de la Recherche Scientifique (CNRS), Institut Fédératif de Recherche en Sciences et Ingénierie de la Santé (IFRESIS-ENSMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-IFR143, Arts et Métiers, and Universidade de Tras-Os-Montes e Alto Douro (UTAD)
- Subjects
Materials science ,Softwood ,Shear stiffness ,Grid method multiplication ,Mechanical testing ,Stiffness ,Mechanical properties ,Fixture ,Wood ,[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph] ,Transverse plane ,Shear (geology) ,Mechanics of Materials ,Pine wood ,[SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph] ,Ceramics and Composites ,medicine ,medicine.symptom ,Composite material - Abstract
International audience; In this work, the application of the unnotched Iosipescu test for the evaluation of the radial variability of longitudinal–radial stiffness parameters of maritime pine wood was investigated. Rectangular specimens with grain at 45° were tested using the Iosipescu fixture. For this configuration both the transverse (Q22) and the shear (Q66) stiffness parameters can be simultaneously identified by the virtual fields method. Displacement fields were measured by the grid method. The strain fields were reconstructed from the raw displacement fields using a polynomial approximation scheme. For the tested wood material, it was found that both parameters decrease from the centre to about the middle radius of the stem and increase afterwards to the outermost positions. Moreover, a relatively good correlation was obtained between the patterns of radial variability of Q22 and Q66.
- Published
- 2009
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