Avalia??o do módulo de elasticidade da madeira com uso de método n?o-destrutivo de vibra??o transversal

摘要

Numerous researches have been developed, applying non-destructive techniques to complex matrix materials, e.g. wood. The resonance method was one of the first studied for the determination of MOE of wood. Despite the great advances obtained in this matter, with the development of special techniques like ultrasound, the resonance method reveals a great potential of utilization mainly due to the well defined mathematical model associated to the physical phenomenon and the possibility to use it on in-grade test (using commercial size lumbers). This paper presents the application of this non-destructive method to three species of eucalyptus. Using resonance non-destructive method and posterior bending static tests were analyzed specimens of 2 cm x 2 cm x 46 cm of E. grandis, E. saligna e E. citriodora. Non-destructive tests were carried out using BING - Beam Identification by Non-destructive Grading, a commercial system that analyses vibrations in the time and frequency domains. Results revealed a great correlation between MOE determined by the non-destructive and the conventional methods, justifying the beginning of an experimental program with commercial size lumbers.