A Notched Cleavage Specimen for Evaluating Strength of Glue Joints

A new method of testing glue joints in edge-glued panels has been developed and evaluated. The test employs a notched cleavage specimen that is readily applicable to the testing of glue joints in edge-glued panels, a product which has not been adequately controlled because of the dearth of readily applied testing techniques. The notched cleavage specimen develops stresses that closely approximate the stresses due to moisture content changes in an edge-glued panel in service. The variables that affect the breaking load for the notched cleavage specimen are easily controlled if it is desired to keep variability at a minimum. it is possible to achieve a coefficient of variation of 8 to 10 percent. The test is simple and rapid, which makes it applicable to quality control programs in the wood-using industry.

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