Compression Shear Test for Determination of Internal Bond Strength in Particleboard

A compression shear test is described in which a particle board test specimen is incorporated into a column so that the center plane of the specimen is oriented at 45? to the axis of the column. Upon application of a compressive load to the column, maximal shear stresses develop in planes 45? to the direction of the applied load and, thus, parallel to the center plane of the specimen. The specimen fails in shear along those planes, although the failure is not limited to the center plane of the specimen. A comparison was made between this shear strength value and the standard internal bond strength of eight commercial particleboard types. The correlation between the results of the two tests was high (r= .917). The equation of the regression line was y = .197x 7.05, where y = internal bond strength and x = shear strength. The described test can also be used for thin boards.

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