Resin materials are widely used in industrial fields as adhesives, coatings, etc. When used as adhesives or coatings, it is necessary to understand the adhesion mechanism to ensure their reliability. However, it isn't easy to evaluate the Adhesion strength using conventional methods, such as the lap shear test, due to the influence of the specimen size and shape, especially in the case of coatings. In this study, a micro-sample shear test was proposed to evaluate the adhesion strength of resin/metal interfaces, and the effect of resin stiffness on the obtained adhesion strength was investigated. The experimental results revealed the following. (1) High-stiffness resins showed less dimensional dependency due to reduced deformation during shear testing. (2) Double-layer samples with high-stiffness resin provided improved adhesion strength compared to single-layer samples.
SUTO et al. (Wed,) studied this question.