Método ultrassônico para estimativa do módulo de elasticidade de madeiras de Pinus taeda tratadas termicamente

Abstract

This study aimed to estimate the modulus of elasticity of Pinus taeda thermally modifi ed wood by ultrasonic nondestructive method. To achieve this, 93 samples with dimensions 2.5x2.5x41.0cm (thickness, width and length) from pine boards were prepared. The wood samples were thermally modifi ed through two distinct treatments (Combination and Oven). The Combination treatment was performed in an autoclave at 130°C±3°C and pressure of 2kgf cm-2 for 3 hours. After a period of conditioning, the wood samples were heated in an electric oven 160°C±1°C for the same time. On the other hand, wood samples of the Oven treatment was modifi ed with only last condition. The mathematical models showed r2 between 0.48 and 0.66 and signifi cance at 1% of probability of error. Thus, improvement of ultrasonic nondestructive tests shows that technique could be useful and effi cient in order to estimate modulus of elasticity of Pinus taeda wood.