EXPERIMENTAL-DETERMINATION OF THE PEEL ADHESION STRENGTH FOR METALLICFOILS

This work addresses the problem of experimental measurement of peel ad hesion in cases where a non-recoverable (plastic) deformation energy o f the peeled foil, plus frictional losses, constitutes a significant p ortion of the total peel energy. In standard tests, when the true adhe sion strength is desired, the plastic energy has to be calculated and deducted from the total energy. Several studies have been dedicated to the modelling and calculation of the energy dissipated through plasti c deformation so that the net adhesion energy could be deduced. These calculations are cumbersome and impractical for general use. A simple experimental technique for the determination of the net adhesion stren gth is proposed. Experimental results with similar to 0.1 mm thick foi ls of stainless steel, nickel, and titanium confirm the theoretical pr edictions regarding the energy balance during peeling. Using the propo sed methodology, there is no need to calculate or otherwise determine the deformation energy losses of the peeled foil or the frictional dis sipation. The method is not limited to a particular material and can b e used successfully for strain hardening plastic as well as metallic f oils. Peel tests on adhesively bonded specimens of stainless steel and nickel and of a thermal spray-coated Ti alloy foil were carried out t o demonstrate the applicability of the proposed method.