TORSIONAL FATIGUE TEST FOR ADHESIVE-BONDED BUTT JOINTS

A torsional fatigue test for adhesive bonded butt joints is presented. The apparatus for the test is a modification of the standard fixture outlined in the ASTM E 229 test for determining the shear strength of adhesive bonds subject to torsion. This apparatus is designed to be used on a universal testing machine and can be used to determine the fatigue life of adhesive butt joints under torsion. The fixture can be further modified to make it suitable for testing adhesive bonded shaft joints under torsion. Sample results from fatigue tests performed on a joint between steel and phenolic resin-cotton fiber laminate adherends are presented to show the viability of the fatigue test apparatus.