Determinación de las propiedades de flexión del contrachapado de lauán mediante ensayos de flexión por compresión = Determination of bending properties of lauan plywood by compression bending tests
DOI:
https://doi.org/10.20868/ade.2021.4970Keywords:
lauán, madera contrachapada, ensayo de flexión por compresión, resistencia a la flexión, El módulo de Young, lauan, plywood, compression bending test, bending strength, Young’s modulusAbstract
Las propiedades de flexión de la madera contrachapada generalmente se obtienen a partir de pruebas estándar de flexión de 3 o 4 puntos. Estos ensayos han sido ampliamente cuestionados debido a la influencia del método de medición de la deflexión y debido a la concentración de tensiones en las proximidades del área de contacto de la muestra con el dispositivo de carga. Algunos autores han propuesto el uso de ensayos de flexión por compresión para estos fines. Pero los resultados relacionados con la resistencia son más bajos de lo esperado e incluso más bajos que los de la prueba de flexión de 3 puntos. En este artículo, describimos algunas soluciones, como aumentar la longitud de las muestras y determinar la resistencia, incluidos los efectos de la tensión a la compresión, y no solo a la flexión. En este sentido, se realizaron ensayos de flexión por compresión para medir las propiedades de flexión -resistencia y módulo de Young- de contrachapados de lauan de 9 y 12 mm. Finalmente, los resultados de las pruebas se comparan con los valores del Estándar Agrícola Japonés (JAS) para madera contrachapada para verificar la aplicabilidad.
Abstract
The bending properties of plywood are usually obtained from standard 3 or 4 points bending tests. These tests have been thoroughly questioned because of the influence of the deflection measurement method and because of the stress concentration in the vicinity of the specimen contact area with the loading fixture. Some authors have proposed the use of compression bending tests for these purposes. But the results concerning strength are lower than expected and even lower than those from 3 points bending test. In this paper we outline some solutions like to increase the length of the specimens and to determine the strength including compression, and not only bending, stress effects. In this sense, compression bending tests were conducted to measure bending properties -strength and Young's modulus- of 9 and 12mm lauan plywood. Finally, tests results are compared with values from Japanese Agricultural Standard (JAS) for plywood in order to check applicability.
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References
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