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Analysing variance for determining humidity content and measuring directional effect on ultrasound speed in pinus radiata D. Don wood samples
Estudio del efecto de la dirección de medición y contenido de humedad en la velocidad de ultrasonido en madera de pinus radiata D. Don a través de análisis de varianza
DOI:
https://doi.org/10.15446/ing.investig.v29n3.15197Keywords:
Pinus radiata, ultrasound, factorial design (en)Pinus Radiata, ultrasonido, diseño factorial (es)
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This study was carried out in order to analyse the ultrasound technique as an alternative form of assessing the structural state of different wooden buildings. This work studies the effect and relative importance of measurement direction and moisture content on ultrasound speed in wood. Radiata pine wood samples were subjected to 1 MHz longitudinal ultrasound pulses. A 22 factorial design was run in a completely random experiment. Measurement direction was the significant factor, as shown by the analysis of variance, explaining 95% of total ultrasound velocity variability. Average tangential and radial propagation speeds were between 0% and 15% moisture content, 1644 m/s and 2130 m/s, respectively. The results of this study showed that wave propagation direction is the most important factor during wood structure ultrasound evaluation. Future studies with combined planes are underway.
Para analizar la técnica de ultrasonido como una alternativa en la evaluación del estado estructural de diferentes edificaciones construidas en madera, se estudió el efecto e importancia relativa de la dirección de medición y el contenido de humedad, sobre la velocidad de transmisión en este material. Para esto, se aplicaron pulsos longitudinales ultrasónicos de 1 Mhz sobre probetas de madera de Pinus radiata D. Don, bajo un procedimiento experimental que consideró la utilización de un diseño factorial 22 completamente aleatorizado. Como resultado del análisis de varianza, se determinó que dentro de los rangos de contenido de humedad y dirección de medición estudiados, este último se presenta como factor significativo, explicando el 95% de la variabilidad total observada. De hecho, la variación del contenido de humedad entre 0 y 15%, conlleva a valores de velocidad de propagación promedio de 1.644 m/s y 2.130 m/s para las direcciones tangencial y radial, respectivamente. Los resultados de este trabajo permiten concluir que al momento de realizar una evaluación mediante ultrasonido en estructuras en servicio, principalmente se debe considerar la dirección de medición como un factor determinante en el estudio; sin embargo, la efectividad de aplicación de esta técnica requiere de otros trabajos complementarios que consideren la propagación en planos mixtos de la madera. Este estudio se llevará a cabo próximamente.
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Copyright (c) 2009 Rodrigo Ortíz Mansilla, Erik Baradit A., José Navarrete A.
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