Predicting Rolling Shear Modulus of Plywood

Rolling shear stress may develop in some structural applications, such as box-beams, I-beams, gusset plates, and stressed-skin panels. Determination of plywood rolling shear modulus is a very time-consuming process. Based on the proposed formula, plywood rolling shear modulus can be predicted from true rolling shear modulus (GTR) and parallel shear modulus (GLR) of unidirectionally laminated veneer. More simply, plywood rolling shear modulus can be predicted from true rolling shear modulus alone. Experimental results indicate that observed values of southern pine plywood rolling shear modulus, determined from 6- by 18-inch specimens, agree reasonably well with predicted values. In all types of plywood specimens tested, the error was 16 percent or less for the mean values. Values of individual specimens might deviate more from predicted ones.

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