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Estimation of the dynamic elastic properties of wood from Copaifera langsdorffii Desf using resonance analysis

Author(s): Edson Rubens da Silva Leite | Paulo Ricardo Gherardi Hein | Tomé Moreira de Souza | MSc in Agricultural Engineering – Departamento de Engenharia – Universidade Federal de Lavras/UFLA – Campus Universitário – Cx. P. 3037 – 37200-000 – Lavras, MG, Brasil –

Journal: Cerne
ISSN 0104-7760

Volume: 18;
Issue: 1;
Start page: 41;
Date: 2012;
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Keywords: Acoustic | transverse vibration | elasticity | shear | stiffness

Analysis of transverse vibrations has been identified as a simple, inexpensive, fast and effective method of characterizing the elastic properties of several materials, including wood. The objective of this study is to evaluate the dynamic elastic properties of wood from Copaifera langsdorffii through resonance analysis. A linear correlation was observed, with a coefficient of determination of 0.88, between the dynamic modulus of elasticity (Ed), as determined by BING (resonance analysis), and the static modulus of elasticity (E), as determined by a universal testing machine, for wood samples of Copaifera langsdorffii. A moderate correlation was observed (0.69) between the Ed and the apparent density (D) of the samples. The shear modulus (G) was negatively correlated with D, E, and Ed, yet not significantly. The specific modulus, which is the stiffness to density ratio, was linearly correlated with the internal damping. This viscoelastic correlation is rarely reported in literature and indicates, for instance, wood quality for the manufacture of musical instruments. The BING system provided fast, reliable results for estimation of elastic properties, particularly stiffness, in wood of Copaifera langsdorffii.
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