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이축 하중이 작용하는 구멍 주위에서 피로 균열 발생에 대한 위상차의 영향
허용학(Y.H. Huh),박휘립(P.Park),김동진(D.J. Kim),이완규(W.K. Lee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Effect of phase difference on fatigue crack initiation around a hole subjected to biaxial fatigue loads was investigated. Axial and torsional biaxial fatigue loads with different phase differences and biaxiality of 1/√3 were applied to thin-walled tubular specimens. Five phase differences of 0. 45, 90, 145 and 180 degrees were selected. Direction of the fatigue crack initiation around the hole was found to approach to the circumferential direction of the specimen with increment of the phase difference for<br/> fatigue tests with phase difference less than 90˚. Whereas the direction for tests with phase<br/> difference greater than 90˚ was symmetric to that for tests with phase difference less than 90˚. Furthermore, it was shown that the fatigue initiation life decreased with increment of phase difference but it increased for tests with phase difference greater than 90˚ . The crack initiation direction can be successfully explained by using the direction of the maximum tangential stress range obtained around the hole and at far-field.
구조물 신뢰성 설계 및 평가를 위한 재료 물성 데이터베이스 시스템
이완규,허용학,백운봉,박휘립,정인현,안병욱 한밭대학교 생산기반기술연구소 2002 생산기반기술연구소 논문집 Vol.2 No.1
Information on material property may be considerably important in design and evaluation based on reliability in structures including industrial facilities and civil structures. In this study, a database system including the information on properties of the structural materials was developed. The material property constructed in this system includes physical properties, tensile properties, impact properties, hardness properties, fatigue properties, creep properties, fracture properties, and corrosion properties. This system contains 145,000 numeric data of materials property for 600 kinds of metals. In this system designed as user-friendly system, the data can be retrieved through internet and shown in both numeric and graphical forms.