The Relationships Between Torsion-Shear and Other Strength Properties of Particleboard

Twenty-one commercial particleboards of widely differing manufacturing processes, densities (28 to 42 lb./ft.3) and thicknesses (1/2 to 1-1/8 inch) made by seven Canadian manufacturers were used to study the correlations between torsion-shear strength and screwholding strength, hardness, and surface strength. It was found that torsion shear measured at the center plane was related to edge-screwholding strength. Torsion shear measured at quarter-points (between surface and the center, plane) was related to face-screwholding strength, and torsion shear measured 1/8-inch below the surfaces was related to surface hardness and surface strength (tensile perpendicular to surface). In addition, previous studies also indicate torsion-shear strength can predict internal bond strength, bending strength, and layer density of particleboard The general goal of this series of studies was to determine if the measurement of shear strength at various planes in the board would adequately characterize the important physical properties of that board. This report concludes that the important strength properties of a particleboard can be reliably and rapidly predicted by the simple torsion-shear technique.

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