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핫 스팟 응력을 이용한 요트 알루미늄 마스트 러그의 피로강도 평가
노지선(Ji-Sun Roh),김명현(Myung-Hyun Kim) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
Recently, according to the increase of income and quality development of life, a variety of leisure boats and facilities has been invigorated. So interests about development of design and the production technology have been increased. However, research & development about yachts has been neglected due to its situation that market of domestic leisure ships is in level of beginning. Also, skill of technology lags behind compare to advanced country. Therefore, it is required to evaluate the local strength of yacht. In case of accident of yacht, the major failure region is a connection between mast and deck or lug of mast. This paper deals with the fatigue strength assessment for lug of yacht's mast using hot spot stress.
해양레저용 요트의 마스트 러그 형상에 따른 응력집중계수 추정
노지선,오동진,김명현,Roh, Ji-Sun,Oh, Dong-Jin,Kim, Myung-Hyun 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.1
Recently, according to the increase of income and development of quality of life, the leisure industry has been developed. In particular, the interest of design and manufacture technology of leisure yacht has significantly increased. However, domestic market of leisure ships is currently in its initiating stage. So research and development for structural strength of leisure yacht need to be investigated. In this study, lug of yacht's mast which is known for a critical damage region is explicitly considered. This paper deals with the estimation of stress concentration factors (SCFs) for lug of yacht's mast depending on dimensions of lug using hot spot stress. Also, SCF formulae is suggested using parametric study.
용접배관 절단 및 원주용접을 고려한 잔류응력 재분포 특성 연구
노지선(Ji-Sun Roh),이명수(Myung-Su Yi),박중구(Jung-Goo Park),김명현(Myung-Hyun Kim) 대한용접·접합학회 2024 대한용접·접합학회지 Vol.42 No.1
Seam pipes are easier to manufacture and cheaper than seamless pipes, and are widely used in the manufacture of pipe spools for marine plant facilities. The manufacturing and assembly of seam pipes involve welding and cutting. The localized heating and cooling that occur during these processes may change the existing residual stress and cause deformation. Uncontrolled deformation can accumulate as assembly errors at the next step, potentially delaying the entire process and causing economic losses. Therefore, characteristics of residual stress redistribution caused by cutting and girth welding of seam pipes need to be studied further. In this study, we performed thermo-mechanical analysis of the manufacturing, cutting, and girth welding processes of seam pipes using the commercial finite element analysis (FEA) software MSC Marc and analyzed the characteristics of residual stress. Furthermore, we measured the residual stress in each process using the hole drilling method, analyzed the characteristics of redistributed residual stress, and ensured reliability. Based on the results of FEA and measured residual stress redistribution, we can provide a basis for reasonable mitigation when performing structural integrity evaluation if there is a defect in the weld of the pipe.