NDE of green material with stress waves: preliminary results using dimension lumber

Longitudinal stress wave nondestructive evaluation techniques have proven to be an accurate means of evaluating the quality of wood-based products. Prior research has shown strong relationships between stress wave parameters and static mechanical properties of dry wood-based materials. This research provides some positive evidence that these techniques may be used to presort structural wood materials prior to drying. Literature dealing with stress wave and wood moisture content (MC) relationships has revealed that stress wave speed responds to changes in wood MC in a manner similar to that of other wood properties. This paper reports an experimental program designed to examine the relationship between stress wave characteristics and the static modulus of elasticity of green Douglas-fir dimension lumber. Strong correlative relationships exist between stress wave modulus of elasticity values and those obtained from static bending tests.

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