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엔진 헤드/블록 열 피로 내구 해석을 위한 비정상 온도 해석 기술
이준석(S. Lee),문길민(K.M. Moon),하응지(E.J. Ha),방인완(I.H. Bang),송경(S. Keung),박재인(J.I. Park) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Thermal fatigue, which leads to cracks and possible failure in high loaded engine, is a new challenge in modem engine development. Thus, an accurate thermomechanical fatigue analysis is a key to a successful life prediction of an engine assembly. However, due to many constraints, especially cost effectiveness and develop time reduction, simulation techniques are needed to substitute for thermal fatigue tests. ALCF(Low Cycle Fatigue) analysis is the most qualified simulation method to accurately predict the thermal fatigue. A transient heat transfer method has been developed to give boundary conditions to LCF analysis and also a LCF analysis is performed and validated with test results.
홍성호,김우식,김형식,방인완,오규환 한국산업안전학회 1998 한국안전학회지 Vol.13 No.2
This study was initiated to examine the stress and deformation characteristics of the pipelines which were subjected to various environmental conditions in order to confirm their integrity. As the part of them, this paper presents the analysis results for the effect of ground subsidence combined with main loads on buried natural gas pipelines. The ground subsidence which can occur for buried gas pipeline has been classified to the three cases. Finite element method was used to analyze the effect of ground subsidences on pipeline of 26 inch(0.660 m) and 30 inch(0.762 m) diameter used as high pressure (70㎏_f/㎠(6.86 ㎫)) main pipelines of KOGAS. This paper shows the result of stress analysis for the pipelines subjected to those three case ground subsidence. Comparing these results with safety criterion of KOGAS(0.9 σ_y), maximum allowable settlement and loads have been calculated.