Influence of Timber Humidity on the Velocity of Propagation of Ultrasound
Carlos Alberto Süczs, Ivo Jose Padaratz, Almir Barros da Silva Santos Neto, and Herber Marllon Werlich, UFSC, Florianópolis, SC, Brazil
ABSTRACT The presence of humidity in materials is known that it interferes in the propagation of ultrasonic waves. However, we know little about the influence of timber moisture in ultrasound, especially in Brazilian species. The present work will study this effect, with the use of Swiss equipment, known commercially as Sylvatest. In order to do this, 60 timber specimens were made from Eucalyptus grandis, used as structural material in Brazil mainly in glued laminated beams. Afterwards, other species will be studied. The velocity of ultrasound was analyzed in timber longitudinal, radial and tangential directions, for moistures varying from 0% to 100%. The results will be of great importance for later use of ultrasound in obtaining timber properties in the laboratory, as well as the quality control of timber in natural conditions.
Publication Source: NDTISS '99 - International Symposium on NDT Contribution to the Infrastructure Safety Systems, Nov 1999 in Tores Brazil.
Publisher: Center of Tecnology, Federal University of Santa Maria (UFSM) - [Homepage]
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