The effect of moisture on longitudinal stress-wave velocity (SWV), bending stiffness, and bending strength of commercial oriented strandboard, plywood, particleboard, and southern pine lumber was evaluated. It was shown that the stress-wave velocity decreased in general with increases in panel moisture content (MC). At a given MC level, SWV varied with panel type and test directions. Regression equations relating SWV to MC and bending properties (modulus of elasticity [MOE] and modulus of rupture [MOR]) were established for various products. Both MOE and MOR at different MCs can be estimated by observing the speed of propagation of a longitudinal wave. This information is useful for developing moisture correction factors on the stress-wave related properties for wood-based panel products.
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