ESTIMATION OF THE DYNAMIC ELASTIC PROPERTIES OF WOOD FROM Copaifera langsdorffi i Desf USING RESONANCE ANALYSIS

• Autor(a) principal: Leite, Edson Rubens da Silva
• Data de Publicação: 2016
• Outros Autores: Hein, Paulo Ricardo Gherardi, Souza, Tomé Moreira de, Rabelo, Giovanni Francisco
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Cerne (Online)
• Texto Completo: https://cerne.ufla.br/site/index.php/CERNE/article/view/797
• topic: Acoustic; transverse vibration; elasticity; shear; stiffness.

Analysis of transverse vibrations has been identifi ed 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 langsdorffi i through resonance analysis. A linear correlation was observed, with a coeffi cient 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 langsdorffi i. 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 signifi cantly. The specifi c 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.