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심희진(Hee-Jin Shim),정일헌(Il-Heon Jeoun),김정규(Jung-Kyu Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The membrane type LNG(Liquefied Natural Gas) cargo containment system is a special design structure for the large deformation behavior at LNG temperature(-162℃). The design of membrane is required great confidence so that membrane can plat role in the tightness of flammable fluid storing. LNG cargo containment is loaded and unloaded LNG between twice and five times in a week. During this process, the membrane has exhibited at large deformation behavior due to the variation of temperature and pressure to the self weight. Therefore these phenomena should be considered to improve the safety and reliability of the fatigue life. In this study, the fatigue tests of lap and butt weld joints of membrane type LNG ship were carried out and effective on stress ratio was performed in order to improve fatigue life at LNG temperature. These results is guideline for inspection for membrane type LNG ship.
AE 신호를 이용한 LNG선박용 내조시스템 소재의 균열발생 수명 평가
심희진(Hee-Jin Shim),김민태(Min-Tea Kim),윤인수(In-Su Yoon),김영균(Yung-Kyun Kim),김정규(Jung-Kyu Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The membrane type LNG(Liquefied Natural Gas) cargo containment system is a special design structure for the large deformation behavior. The design of membrane is required great confidence so that membrane can plat role in the tightness of flammable fluid storing. LNG cargo containment is loaded and unloaded LNG between twice and five times in a week. Therefore these phenomena should be considered to improve the safety and reliability of the fatigue life In this study, the fatigue strength, fatigue crack behavior and the stable crack initiation of STS 304L stainless steel are developed by the comparison of STS 304 stainless steel. Also, a acoustic emission(AE) technique, for the study of fatigue cracks nucleation and propagation on STS 304L steel, was investigated at room temperatures
심희진(Hee Jin Shim),오창균(Chang Kyun Oh),김현수(Hyun Su Kim),염학기(Hag Ki Youm) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Metal fatigue is a well-known phenomenon that material characteristics are deteriorated when even a small load is applied repeatedly. Therefore an accurate fatigue life evaluation is very important in terms of the component integrity and reliability. There were various rules and guidelines for fatigue life evaluation such as low cycle and high cycle fatigues of the mechanical components. However, the fatigue life of major nuclear components subjected to various transients has to be evaluated based on the ASME code, section III. In accordance with the recommendation of USNRC, the effects of reactor coolant environment on the fatigue life have to be considered for the continued operation of operating nuclear power plants as well as for the design of new plants. Moreover, in order to monitor and manage the fatigue damage effectively, the fatigue monitoring system is necessary to the operating plants as well as the new plants. The purpose of this paper is to describe the fatigue evaluation procedure based on the ASME code, environmental effect on the fatigue life and fatigue damage management program.
심희진(Hee-Jin SHIM),김철수(Chul-Su KIM),오원철(Won-Chul OH),김정규(Jung-Kyu KIM) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
In order to secure the safety of power steering system, it is necessary to perform the strength and the fatigue analysis of pulley in this paper. The applied stress distribution of the pulley subject to combined loads condition was obtained using finite element analysis. Based on these results, the fatigue life of the pulley with the variation of the fatigue strength was evaluated using durability analysis simulator. The optimal hole size to improved the safety of the pulley was investigated using parametric study. Moreover, the predicted fatigue life cycle with the simulator was verified by experimental tests.
심희진(Hee Jin Shim),김정규(Jung Kyu Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The pulley is one of core mechanical elements in the power steering system for vehicles. The pulley operates under both the fatigue compressive loading and the torque. Therefore, to assure the safety of the power steering system, it is very important to investigate the durability and the optimization of the pulley. In this study, the applied stress distribution of the pulley under high tension and torsion loads was obtained by using finite element analysis. Based on these results, the fatigue life of the pulley with the variation of the fatigue strength was evaluated by a durability analysis simulator. The results at 50% and 1%for the failure probability were compared with respect to the fatigue life. In addition the to optimum design for the fatigue life is obtained by the response surface method. Moreover, optimum design by considering its durability and validity is verified by the durability test.
자동차 에어컨 압축기용 클러치 풀리의 피로해석 및 고장분석
심희진(Hee-Jin Shim),이상민(Sang-Min Lee),김광일(Kwang-il Kim),김정규(Jung-Kyu Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
For the reliability of automotive components, it has to satisfy the high accuracy of dimensions and the strength design requirements for parts that has the consistent strength distribution. However, due to the defects from actual manufacturing process and inhomogeneity of material, different failure damage occur in pulley that has the same shape and material. Therefore, this study has analyzed the critical part by types of plastic processing and investigated the cause of the failure. Moreover, theoretical the critical parts of pulley were verified by the finite element analysis and the durability analysis on the pulley was performed under the fatigue load. Consequently, we were found from the results that relativity of the micro-hardness and strength.