Determination of Impact Shear Strength of Adhesive Bonds with the Split Hopkinson Bar.

Abstract

The impact shear tests on a cyanoacrylate based adhesive (hereafter referred to as the CA adhesive) are conducted by means of a modified split Hopkinson bar using a pin-and-collar specimen. Two adherend materials (or bearing steel and 7075-T 6 Al alloy) are used in the tests. The impact shear strength of the CA adhesive bonds at loading rates of the order of 106 MPa/s is determined from the peak value of the applied shear stress history in the bond-line. Comparative shear tests at low loading rates are carried out on the same design of specimen in an Instron testing machine. The effects of loading rate, thickness of adhesive layer and adherend materials on the shear strength of the CA adhesive bonds are examined. The test results indicate that the shear strength of the CA adhesive bonds increases significantly with increasing loading rate, and is much affected by both the thickness of adhesive layer and the adherend materials.