The Effect of Joint Design and Dimensions on Adhesive Strength

Five joint designs in steel or aluminum are compared, using both a rubbery and a tough adhesive, cured at room temperature. Circular butts in simple and in torsional shear and tubular butts (“napkin rings”) in torsion are preferable to the ASTM D 1002 lap shear, as the adherend dimensions do not affect the measured strength. Thus the strength of a structure can be better assessed. Circular butts in tension (“poker chips”) are similarly suitable, and are as strong as in simple shear. The circular butts in torsion are stronger than the tubular butts, but the convenient simple-shear butts are nearly as strong.

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