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합금화용융아연코팅강판의 코팅층 접합강도 평가를 위한 단일 겹치기이음 시험의 적용
이정민(Lee Jungmin),이찬주(Lee Chajoo),이상곤(Lee Sanggon),고대철(Ko Daecheol),김병민(Kim Byungmin) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This paper is designed to estimate the adhesion strength of coating layer on galvannealed steel sheet using lap shear test. The single lap shear test is the most commonly used standard test for determining the strength of medium-strength and high strength bonds. The bond strength of bonded single lap joints on subjecting the substrates to loads is determined by lap shear forces in the direction of the bonded joint. In this study, specimen for adhesion strength test was made to attach coated sheet to cold rolled sheet and were heated in temperature of 180 for 20minutes. After test, detached parts of coatings on coated sheet were observed using SEM and EDX to identify substrate and complete detachment. The tested results showed that adhesive strength of coating is unrelated to anisotropy of sheet and is difficult to be extracted using conventional theory because of fine cracks of coating layers which were created during annealing process.