Adhesion test using tensile tests on bonded specimens

end face separation test

In this test, two bonded end faces (two test specimens) are separated using a tensile test. The aim of the application is to prove that a coating of a workpiece with a hard layer (similar to chrome plating) has the required adhesion. For this purpose, one or more test pieces are also coated during production. This test specimen is then bonded to another coupling element.

In a tensile test, the coated test piece and the bonded counterpart are separated and the maximum force is determined. In order to be able to make a statement about the adhesion of the coating to the workpiece, the determined maximum force is divided by the front surface of the test piece and thus an adhesion per mm² is determined. 

During the test, care must be taken to ensure that the test pieces or bonding surfaces are not subjected to any bending influence (moment). Therefore, a cardanic clamping device to choose: Here threaded head grips for threaded head specimens.