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이종 접합체의 원공에서 파생하는 균열에 대한 혼합모드 파괴기준의 설정
정남용,송춘호,Jeong, Nam-Yong,Song, Chun-Ho 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.6
Application of bonded dissimilar materials in many industries are increasing. When these materials are to be used in structures, it needs to evaluate the failure strength applying fracture mechanics. Al/Epoxy bonded dissimilar materials with an interface crack and an interface crack emanating from an edge semicircular hole were prepared, experiment of fracture toughness were carried out. Stress intensity factors of interface cracks in bonded dissimilar materials were computed with boundary element method(BEM) and the fracture criteria of mixed mode crack were analyzed. From the results, the fracture criteria and the method of strength evaluation by the fracture toughness in Al/Epoxy bonded dissimilar materials were proposed.
응력특이성을 고려한 SUH35/SUH3 마찰용접재의 강도평가
정남용(Nam Yong Chun),박철희(Chul Hee Park),이대영(Dea Young Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
Recently, the cases of using friction welded SUH35/SUH3 tend to increase in the field of automotive engine valves. It is required that stress singularities under residual stress with loads on an interface for friction welded dissimilar materials are analyze to establish strength evaluation method, In this paper, strength evaluation method of friction welded materials was investigated by boundary element method and static tensile testing. An advanced method of quantitative strength evaluation for SUH35/SUH3 friction welded material is to be suggested by establishing fracture criterion by using stress singularity factors.