Tensile and compressive MOE of flakeboards

Normally pressed gradient-density flakeboards were tested for tensile and compressive modulus of elasticity (MOE). The panels were nonaligned and single-layer aligned. Multiple regression equations were developed for axial MOE versus board specific gravity and ultra-sonic wave speed in the direction of mechanical test. These regression equations, along with specific gravity profiles through the panel thickness, were used to calculate predicted effective bending MOE. The regression model found to be most appropriate involved use of logarithmic transformation of the factor and response variables. Tensile MOE of this type of flakeboard apparently exceeds its compressive MOE. Wave propagation speed in the direction of test appears to be a practical measure of alignment, although it is not independent of panel specific gravity. Predicted effective bending MOEs were in reasonably close agreement with measured effective bending MOES.

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