Strength and ultimate slip characteristics of wood joints with elastomeric construction adhesives

Three-hundred-sixty wood joints connected with elastomeric construction adhesives were tested to destruction in lateral shear loading. The joints consisted of a piece of plywood (loaded perpendicular to the grain) connected to solid wood. Two species of solid wood, two thicknesses of plywood, three generically different adhesive types, and three bondline thicknesses (interlayer gap) were studied. Ten replications of every combination of previously mentioned variables were performed. The results indicated that neither plywood thickness nor solid wood species affected ultimate joint performance, therefore, all data from tests on specimens of similar adhesive type and interlayer gap were combined. With this larger body of data, it was found that the effect of interlayer gap in bonded joints was similar to that of nailed joints. With greater interlayer gap, came less strength and more deformation at failure. In terms of adhesive type, the urethane-based adhesive performed consistently poorer than the rubber- and acrylic-based adhesive.

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