Design of fatigue strength on adhesive interface between metal and resin in Resin-molded structure

• Published in: Kikai Gakkai ronbunshū = Transactions of the Japan Society of Mechanical Engineers Vol. 80; no. 818; p. TRANS0291
• Main Author: YAMAZAKI, Miki
• Format: Journal Article
• Language: Japanese
• Published: The Japan Society of Mechanical Engineers 01.01.2014
• Subjects: Adhesion-strength index; Adhesive strength; Confidence intervals; Design analysis; Design engineering; Fatigue strength; Interfacial strength; Multiple scales; Polymers; Resin-molded structure; Resins; Surface roughness; Surface roughnesses
• ISSN: 2187-9761
• DOI: 10.1299/transjsme.2014trans0291

For the stabilization of insulation performance in the resin-molded insulators, strong adhesion between the resin and metal is required. In this paper, design method of fatigue strength on adhesive interface between metal and resin in consideration of multiple scales was investigated. Test pieces were made by covering Cu and SUS cylinders, which have some values of surface roughness, with epoxy resin. The interfacial strength was evaluated with shearing tests of these test pieces. The effective adhesive surfaces of those cylinders were evaluated from surface observation with a laser microscope. The interfacial strength increased with surface roughness and the adhesion-strength index (μ+B). The adhesion-strength index (μ+B), which had been proposed in previous paper, were calculated with the effective adhesive surface and the interfacial strength. The adhesion-strength index (μ+B) gave a constant value with various surface roughnesses for each metal. Based on the strength evaluations, the interfacial strength could be controlled, and it became clear from the results that the interfacial strength can be improved up to the confidence level. The results also show that design of the interfacial strength over multiple scales can help improve the reliability of electric power equipment.