Dependence of MOE on Strength Ratio and Specific Gravity: 4-Inch-Thick Southern Pine

There is an accumulation of evidence that modulus of elasticity (MOE) is grade-dependent. The dependence of MOE on grade has been shown in various studies of 2-inch dimension lumber visually graded according to ASTM D 245, as well as in the many studies associated with the development of machine stress rating. These studies show that the lower grades of lumber have a lower average MOE than the higher grades. Additional evidence that MOE is grade-dependent is contained in data gathered in two studies at the Forest Products Laboratory on the effect of seasoning on MOE and modulus of rupture (MOR) of 4-inch-thick southern pine beams. These studies show that linear functions of strength ratio and specific gravity accounted for about 67 percent of the variations in modulus of elasticity of 4-inch-thick southern pine beams.

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