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

CERNE

Edson Rubens Da Silva Leite²  Paulo Ricardo Gherardi Hein¹  Tomé Moreira De Souza¹  Giovanni Francisco Rabelo¹ 

[1] ,Instituto Federal de Educação, Ciências e Tecnologia do Sul de Minas GeraisMachado MG ,Brasil

关键词: Acoustic;    transverse vibration;    elasticity;    shear;    stiffness;    Acústica;    vibração transversal;    elasticidade;    cisalhamento;    rigidez;   

DOI  :  10.1590/S0104-77602012000100006

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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