PLASTIC WORK IN THE PEELING OF WORK-HARDENING FOILS

The plastic work consumed by the flexible metallic foil during a peel test can contribute significantly to the measured load. It is thus imp ortant to be able to quantify it in order be able to make inferences a bout the adhesion at the interface. Several models have been previousl y proposed which allow the calculation of the plastic work, based on t he modulus and yield stress of the flexible metallic foil, assuming id eal plastic behavior. When testing the adhesion of thermal spray coati ngs, for example, a stainless steel foil is used which work hardens du ring peeling. A method is proposed here which allows the calculation o f the plastic work during peeling for a work hardening material with e xperimentally determined stress-strain relationship. The plastic work is calculated by integrating the stress-strain curve for the peeled ma terial numerically. The prediction is then compared with experimentall y measured plastic work values for several materials.