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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1281

Title: Predicting modulus of rupture of solid and finger-jointed tropical African hardwoods using longitudinal vibration
Authors: Ayarkwa, Joshua
Hirashima, Yoshihiko
Sasaki, Yasutoshi
Issue Date: 2000
Publisher: Forest Products Society
Citation: Forest Products Journal, vol. 51, No. 1
Abstract: The longitudinal vibration technique was examined as a means of evaluating the modulus of elasticity (MOE) and predicting the modulus of rupture (MOR) of solid and finger jointed lumber from three tropical African hardwoods, Obeche (Triplochiton scleroxylon), Makore (Tieghemella heckelii), and Moabi (Baillonella toxisperma). Dynamic MOE was well correlated to static bend- ing MOE for solid and finger jointed lumber from the three tropical African hardwoods. Correlation coefficients of0.94 and 0.90 ob- tained for the regression of dynamic MOE on MOR for solid and finger jointed lumber, respectively, were comparable to those of 0.95 and 0.91 between static MOE and MOR for solid and finger jointed lumber, respectively. Regression models developed for the regres- sion of dynamic MOE on MOR for both solid and finger jointed lumber were statistically highly significant ((X = 0.05). The lower 5 percent exclusion limit lines derived seemed useful for predicting the MOR of solid and finger jointed lumber from the three hard- woods. Although the static bending test is generally recognized as a more desirable method of determining MOR, the results indicated that the longitudinal vibration technique may also be useful as a nondestructive technique for predicting MOR of solid and finger- jointed tropical African hardwoods. The technique seems more applicable in situations where static bending testing is not feasible to undertake.
Description: This article was published by Forest Products Society in 2000.
URI: http://hdl.handle.net/123456789/1281
Appears in Collections:College of Architecture and Planning

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