1107 界面き裂を利用した溶射皮膜の密着強度評価法  [in Japanese] A New Evaluation Method of the Adhesive Strength of Thermal Sprayed Coatings with Interfacial Crack  [in Japanese]

A new method for evaluating the tensile adhesive strength of thermal sprayed coatings has been developed by based on the interfacial mechanics. A newly designed test specimen incorporates an artificially introduced circumferential crack to control the stress intensity factor at the crack tip on the interface between a coating and the substrate. The stress intensity factor K_<Int> is employed as a criterion of interfacial debonding. The FE-analysis is used to calculate K_<Int> for actual test specimen. When the results of tensile test are sorted out using the stress intensity factor K_<Int>, universal values are obtained regardless of crack length and specimen diameter, suggesting that employing K_<Int> enables the adhesive strength to be more fundamentally evaluated.