Rolling Shear Characteristics of Nine Structural Softwoods

Rolling shear properties were evaluated on a random sample of nine structural softwood species: Red, white, and black spruce; balsam fir; subalpine fir; Port-Orford cedar; western redcedar; sugar pine; and western white pine. Rolling shear strengths in the tangential-longitudinal plane of the five western and four eastern softwoods are about one-fourth to one-fifth of the shear strength parallel to-grain values obtained from 2-inch block shear tests. Western white and sugar pine are relatively high in shear strength and modulus of rigidity for their density. Black and red spruce are relatively low in shear strength for their density. The stress-strain behavior in rolling shear is characterized for the species studied by the Ramberg- Osgood function.

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