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Segregation of Eucalyptus Lumbers for Finger-jointed Using Longitudinal Vibration

【摘要】:The variation in lumber quality within the supply of eucalypt is large. Effective segregation of the lumber according to "fitness for purpose " is fundamental to enabling the capture of greater value for the finger-jointed. This paper deals with the longitudinal vibration technique as a means of assessing modulus of elasticity (MOE) of solid and finger-jointed specimens made with Eucalyptus grandis × E. urophylla and E. grandis. Dynamic MOE was calculated from resonance frequencies obtained from longitudinal vibration. The dynamic MOE was well correlated to the static bending MOE for solid and finger-jointed lumber from the two eucalyptuses. Correlation coefficients were obtained for the regression of dynamic MOE on static bending MOE for solid and finger-jointed lumber, and were statistically significant. Although the correlation coefficient of finger-jointed was lower than that of solid lumber, the results indicated that the static bending MOE of finger-jointed was strongly correlated with the dynamic MOE of solid lumber, namely, the solid lumber with higher dynamic MOE can produce higher bending MOE finger-jointed. It can be concluded that the longitudinal vibration technique may be useful as a nondestructive method for segregating lumbers for finger-jointed.

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