Moisture content effect on ultrasonic velocity in Goupia glabra

Materials Research

Fabiana Goia Rosa De Oliveira²  Marcela Candian¹  Francieli F. Lucchette¹  José Luis Salgon¹  Almir Sales¹ 

[1] ,University of São PauloSão Carlos SP ,Brazil

关键词: ultrasonic velocity;    moisture content;    wood;   

DOI  :  10.1590/S1516-14392005000100004

来源: SciELO

【 摘 要 】

This paper discusses the application of ultrasound waves on a Brazilian hardwood, Goupia glabra, to evaluate the sensitivity of the ultrasonic technique to the moisture content in wood. The velocity of ultrasonic wave is sensitive to the material's quality-determining factors; hence, this technique is an important industrial tool to improve the quality control of processes. The nature of the response of velocity of sound to changes in moisture content led us to conclude that moisture gradients during drying exert a dominating effect. The ultrasonic velocity was measured both parallel and perpendicular to the fibers of Goupia glabra during drying from green to 6% moisture content. The results of this study showed that velocity of ultrasonic waves is sensitive to changes in moisture content of lumber during drying. The velocity under dry conditions was always higher than the velocity under more humid conditions, in both directions of propagation.

【 授权许可】

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