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변동하중하의 잔류응력을 고려한 십자형 용접부의 잔존 수명 예측에 관한 연구
김성훈,김경수,이장현,유창혁,유원효,유미지,Kim, Sung-Hoon,Kim, Kyung-Su,Lee, Jang-Hyun,Yoo, Chang-Hyuk,You, Won-Hyo,Yoo, Mi-Ji 대한용접접합학회 2011 대한용접·접합학회지 Vol.29 No.2
This paper deals with the crack propagation life assessment of T-joint welded structure where typical fatigue cracks have been frequently initiated when the marine vessels experience the storm load. Welding residual stresses are calculated to investigate its effects on the fatigue life. Thereafter the residual stress distribution was applied to the AFGROW life prediction program, which incorporated the loading, the welding residual stress, and the geometric shape of the structure. The fatigue tests of the T-joint welded specimen under storm loading show the beach mark clearly generated on the fractured section of the weldment. The crack propagation life estimated based on the beach mark is compared with that of AFGROW to validate the life prediction. Based on the results, the evaluation method of the remaining fatigue life for T-joint fillet weldment of marine vessel's cargo hold with random load or storm load was established.
도금을 통한 배열회수보일러의 중ㆍ저압부 전열관 수명증대 방안에 관한 연구
최종문(Jong Moon Choi),김원석(Won Suk Kim),진우성(Woo Sung Jin),유창혁(You Chang Hyuk),이찬우(Chan Woo Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
In cases of HRSG heat transfer tubes established in combined cycle power plant, corrosion conditions of IP/LP areas are serious than HP areas. Thin fin thickness by damage and deadlock between fins by dropouted fin caused excessive corrosion makes power efficiency decrease. This scattered rust powder by dropout fin may cause environmental pollution and a civil appeal. So, through this study, we made comparative analysis of lifetime of Zinced tubes, Aluminum coated tubes and Enamel coated tubes, have researched about coating methods for high corrosion resistance in composite corrosion environment like Sulfur Corrosion, Acid Corrosion, Thermal Stress, etc.