Adhesive Durability: Specimen Designs for Accelerated Tests

Test specimens intended for strength measurement after cyclic degradation treatments should be narrow or thin (of the order of 1/2-inch) in at least one dimension in order to moderate checking and splitting of the wood. A specimen design of 1 by 1 inch of shear area and 5/16-inch thick laminations approaches an optimum design for block-shear test specimens intended for accelerated aging treatments. For the tension perpendicular test mode, cleavage was considered to be particularly appropriate for durability studies, because it simulates inservice stresses that tend to cause delamination. A special cleavage test with, a V-bottom notch, termed tensile splitting, was developed for this purpose. The modified block-shear and tensile-splitting, test specimens were equally effective in ranking a limited number of adhesives into durability “spectrum” after severe degradation treatments.

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