NON-DESTRUCTIVE ULTRASONIC TESTING METHOD FOR DETERMINING BENDING STRENGTH PROPERTIES OF GMELINA WOOD (<em>GMELINA</em> <em>ARBOREA</em>)
Keywords:ultrasonic, wave velocity, MOEd, MOEs, MOR
Non-destructive ultrasonic testing method for determining bending strength properties of gmelina wood (Gmelina arborea). The objective of this study was to investigate the usefulness of non-destructive ultrasonic testing method in evaluating wood strength and stiffness of gmelina (Gmelina arborea) from several positions in the tree, both vertically and horizontally. These tests were conducted on 72 small clear wood specimens of dimensions 5 x 5 x 76 cm. The effects of position of specimen in a tree could be identified with ultrasonic wave velocity (Vus). The dynamic testing determined by ultrasonic method, Vus and dynamic modulus of elasticity (MOEd), were highly correlated with the static bending test (static modulus of elasticity and modulus of rupture). The developed regression models were significant. Ultrasonic method seems applicable in situations where static bending test is not feasible.