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Properties of structural plywood from southern red oak and mixtures of southern oak, sweetgum, and southern pine



Properties of structural plywood from southern red oak and mixtures of southern oak, sweetgum, and southern pine



Forest products journal 49(9): 25-28



This paper investigates the mechanical properties of southern red oak plywood and mixtures of southern red oak with sweetgum and southern pine that were bonded with a commercial extended phenolic resin. The results indicate that the MOE and MOR values of 3-ply specimens of all groups with face grain parallel to span, as expected, are higher than corresponding values of 4-ply specimens. The MOE and MOR values of 4-ply specimens of all groups with face grain perpendicular to span, as expected, are more than two times higher than corresponding values of 3-ply specimens. All 3-ply and 4-ply cycled (wet-dry) specimens of all species combinations retained between 80 and 95 percent of their original MOE values and between 72 and 99 percent of their original MOR values. The level of property retention after cycling is indicative of the quality of bonding. The plate shear moduli of 4-ply specimens in all moisture conditions are 50 percent higher than corresponding 3-ply specimens. The edgewise shear strength of 4-ply specimens with all-oak veneers in all moisture conditions are also considerably higher than the corresponding 3-ply specimens. The glueline shear strength of all-oak specimens retained 85 percent of the original value after wet-dry cycling. The percent of wood failure, however, was reduced from 50 percent in the original to 25 percent after cycling.

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Accession: 003244836

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