Predicting localized MOE and tensile strength in solid and finger-jointed laminating lumber using longitudinal stress waves

A stress wave technique was examined as a means of predicting localized (2-ft.) modulus of elasticity (MOE) and tensile strength for several grades and species groupings of solid and finger-jointed laminating lumber. MOE calculated from stress wave velocity (MOEsw) was significantly correlated to static bending MOE (MOEb) for both solid and finger-jointed laminating lumber. The correlations between MOEsw and tensile strength (T) were generally similar to the MOEb-T correlations for solid and finger-jointed lumber. It is recommended that if stress wave velocity is used to predict localized MOE, at least two velocity measurements should be taken and averaged.

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