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배시연(Si-yeon Bae) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
There are strong environmental and economic pressures to increase the thermal efficiency of fossil fuel power stations and this has led to a steady increase in steam temperatures and pressures resulting in worldwide plans for ultra super-critical power plants. For examplem, order to improve the thermal efficiency of power plant, there has been a strong drive to develop heat resistant steels with excellent creep, high temperature fatigue and thermal fatigue resistant properties as well as superior oxidation and corrosion resistant properties. In this study, the test material was P122 alloy which has been developed for ultra super-critical power plant. To measure fatigue crack growth at three different microstructures (Base metal, HAZ and Weld metal) regions. Tests were performed with compact tension specimens at 600~700℃ with the loading frequency of 20Hz.
배시연 ( Si Yeon Bae ),이경희 ( Kyoung Hee Lee ) 한국의류산업학회 2015 한국의류산업학회지 Vol.17 No.2
This study was initiated to understand design and detail characteristics of coats that targeted new senior women by analyzing shape, color, fabric and detail. For the new senior, youthful appearance has more appeal than products that represent elder``s style. Among , the coat can be effectively utilized as a trendy fashion item that targets seniors since it is more useful to hide figures than pants, blouses or jackets. The objectives of this research were to: First, examine design characteristics of new senior women’s coat. Second, understand design characteristics of new senior women’s coat. Third, analyze the relationship between the design of collars and details according to type of new senior women’s coat. Photographs collected were categorized according to type of coat. Three types of coat (balmacaan, redingote and trench) were chosen to analyze with the highest frequency. The results of analyzing shape, length, color and fabric of the products made in domestic and foreign brands were similar; however, the collar and way of fastening showed significant results that required specific analysis since the design elements were related to maincoat characteristics in protecting against the cold. The depth of the V-zone can change without change of collar width and design changes in V-zone that influence the coat image that lead to changes in sleeve type and length (or fastening and closing position) method.
발전소 대형 수배관계의 충격성 이상 과도진동의 특성 고찰 사례
김연환(Yeon-Whan Kim),양경현(Gyeong-Hyeon Yang),배시연(Si-Yeon Bae),조종현(Jong-Hyeon Jo),Jae-Myeong Yu 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.10
Leak problem with large pressure drop occurrs non-periodic shock pulsation due to the deterioration of a isolation valve in feed-water recirculation piping system. This paper discusses on the shock vibration and noise occurred due to the effect of acoustical shock pulsations by degradation of the isolation valve in a power site.
Ni기 초내열합금 GTD111 DS의 고온 저주기 피로수명 예측
김진열,윤동현,김재훈,배시연,장성용,장성호,Kim, Jin Yeol,Yoon, Dong Hyun,Kim, Jae Hoon,Bae, Si Yeon,Chang, Sung Yong,Chang, Sung Ho 대한기계학회 2017 大韓機械學會論文集A Vol.24 No.2
Ni기 초내열합금인 GTD111 DS는 가스터빈 블레이드에 사용된다. 본 논문에서는 실제 운전조건과 유사한 조건을 설정하여 GTD111 DS의 저주기 피로시험을 실시하였다 상온, $760^{\circ}C$, $870^{\circ}C$의 온도범위와 다양한 변형률에서 저주기 피로시험을 수행하였다. 실험결과 총 변형률이 증가함에 따라 피로수명은 감소하였다. 상온 및 $760^{\circ}C$에서는 주기적 경화반응이 나타났으며 $870^{\circ}C$에서는 주기적 연화반응이 나타났다. $870^{\circ}C$에서 응력완화 현상은 유지시간에 따른 크리프의 영향으로 나타났다. 피로수명과 총 변형률의 관계는 Coffin-Manson 식을 통해 얻었다. 파단면은 SEM을 통해 초기균열 및 피로진전지역을 관찰하였다. GTD111 DS of nickel base superalloy has been used for gas turbine blades. In this study, low cycle fatigue test was conducted on the GTD111 DS alloy by setting conditions similar to the real operating environment. The low cycle fatigue tests were conducted at room temperature, $760^{\circ}C$, $870^{\circ}C$, and various strain amplitudes. Test results showed that fatigue life decreased with increasing total strain amplitude. Cyclic hardening response was observed at room temperature and $760^{\circ}C$; however, tests conducted at $870^{\circ}C$ showed cyclic softening response. Stress relaxation was observed at $870^{\circ}C$ because creep effects occurred from holding time. A relationship between fatigue life and total strain range was obtained from the Coffin-Manson method. The fratography using a SEM was carried out at the crack initiation and propagation regions.
Ni기 초내열합금 GTD111 DS의 고온 저주기 피로수명 예측
김진열(Jin Yeol Kim),윤동현(Dong Hyun Yoon),김재훈(Jae Hoon Kim),배시연(Si Yeon Bae),장성용(Sung Yong Chang),장성호(Sung Ho Chang) 대한기계학회 2017 大韓機械學會論文集A Vol.41 No.8
Ni기 초내열합금인 GTD111 DS는 가스터빈 블레이드에 사용된다. 본 논문에서는 실제 운전조건과 유사한 조건을 설정하여 GTD111 DS의 저주기 피로시험을 실시하였다. 상온, 760°C, 870°C의 온도범위와 다양한 변형률에서 저주기 피로시험을 수행하였다. 실험결과 총 변형률이 증가함에 따라 피로수명은 감소하였다. 상온 및 760°C에서는 주기적 경화반응이 나타났으며 870°C에서는 주기적 연화반응이 나타났다. 870°C에서 응력완화 현상은 유지시간에 따른 크리프의 영향으로 나타났다. 피로수명과 총 변형률의 관계는 Coffin-Manson 식을 통해 얻었다. 파단면은 SEM을 통해 초기균열 및 피로진전지역을 관찰하였다. GTD111 DS of nickel base superalloy has been used for gas turbine blades. In this study, low cycle fatigue test was conducted on the GTD111 DS alloy by setting conditions similar to the real operating environment. The low cycle fatigue tests were conducted at room temperature, 760 °C, 870 °C, and various strain amplitudes. Test results showed that fatigue life decreased with increasing total strain amplitude. Cyclic hardening response was observed at room temperature and 760 °C; however, tests conducted at 870 °C showed cyclic softening response. Stress relaxation was observed at 870 °C because creep effects occurred from holding time. A relationship between fatigue life and total strain range was obtained from the Coffin-Manson method. The fratography using a SEM was carried out at the crack initiation and propagation regions.