Relationships between small-specimen and large panel bending tests on structural wood-based panels

Four test methods were used to measure bending strength and stiffness of nine different structural wood-based panels. Four plywoods, four oriented strandboards, and one waferboard were evaluated by one small-specimen test and by three large-panel tests: pure moment (Post flexure), midspan-loaded machine stiffness rating, and third-point loading. The three large-panel tests yielded higher modulus of elasticity (MOE) values and lower modulus of rupture (MOR) values than the small-specimen test. Regression equations were developed that accurately predict MOR and MOE values between test methods. These equations were applicable to the nine structural wood-based panels, in both the panel length and width directions.

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