Effect of Type and glue Coverage Rates on Dynamic Young's Modulus in Adhesive Bonds of Beech wood by Using free Vibration Method (ASTM Method)

In this study, influence of three different joint types with two glue coverage rates (Full glued and low glued ) on dynamic Young's modulus using flexural vibration method in free-free bar test was evaluated. Rectangular specimens of 2×4×36 cm (T×R×L) were prepared from intact eastern beech (Fagus orientalis L.) wood. Three types of joint were considered, 45o scarf joint, 30o scarf joint, and finger joint at the middle of the longitudinal-radial plane. Every set of the specimens, before and after joint creation, was individually subjected to flexural vibration test. The results revealed that the type of joint had not significant influence on dynamic Young's modulus. Furthermore, there was no significant difference in modulus of elasticity between solid beam and fully glued specimens in different joint types. Although, by reducing the glued coverage in different joint types, a significant reduction in the dynamic Young's modulus was observed.