Flexural Design Procedure for the Composite Panel

Proposed procedures for calculating and predicting the flexural properties of composite panels formed of veneer faced particleboard cores have been tested by the American Plywood Association and the U.S. Forest Service. Theoretically, it should be possible to calculate panel properties from properties of the components in the panel. In the study, pairs of veneer-faced particleboard composite panels were compared with plywood panels, each pair having matching faces and backs. Six commercial particleboard and similar thicknesses of plywood were tested. Components, and then completed panels, were tested for mechanical properties including tensile stiffness parallel, bending stiffness parallel and perpendicular, and strength perpendicular. Two approaches were used to predict properties; applying conventional bending theory to predict the properties of the composite from those of the components; and starting with properties of the plywood panel and adjusting for replacement of the veneer inner plies with particleboard. The first method gave satisfactory results for all but one property, bending strength parallel to panel length. The second method substantially improved the prediction of maximum parallel bending moment, though it was not completely satisfactory for all constructions. The differences between calculated and observed properties (tensile stiffness parallel to panel length, bending stiffness parallel to panel length, bending strength perpendicular to panel length, bending strength parallel to panel length, and bending stiffness parallel to panel length) are shown in figures.

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