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LNG 선박용 알루미늄 합금 소재의 정적 및 피로 강도 평가
윤용근(Yong-Keun Yoon),김재훈(Jae-Hoon Kim),백경호(Kyeong-Ho Baik),박창현(Chang-Hyun Park) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Natural Gas is stored in the tank as a Liquefied Natural Gas, which is liquefied at the condition of atmosphere pressure and cryogenic temperature. LNG ship is increased because of the high oil price. Also, it is exposed very long time under the cryogenic temperature and high pressure, and it is very important to secure the structural safety in this envelopment. Until now, the material properties which composing the storage tank of LNG ship has experimented at room temperature, so the properties which experiments at the cryogenic temperature are not enough to apply for the design. The purposes of this study are investigated mechanical properties for aluminum alloy. To evaluate tensile and fatigue test for aluminum alloy, it was considering static and fatigue conditions at room and cryogenic temperature. S-N curves were designed at both temperature respectively. S-N curves were designed at both temperature respectively. Also, P-S-N curve was performed statistical method by JSME-S002.
열노출에 의한 IN738LC의 기계적 특성 및 미세조직 변화
윤용근(Yong-Keun Yoon),김재훈(Jae-Hoon Kim),유근봉(Keun-bong Yoo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
High strength nickel-base super alloys have been used in aircraft engine, vessel engine and turbine blades because of excellent for high strength, fatigue resistance and oxidation resistance. In this study, there were prepared specimens of IN738LC that are exposed in 1,000~10,000 hours at 871℃ and 982 ℃. These specimens were performed for the mechanical properties tests and microstructure observation
LNG 선박용 알루미늄 합금 소재의 정적 및 피로 강도 평가
윤용근 ( Yong Keun Yoon ),김재훈 ( Jae Hoon Kim ),김우중 ( Kye Ho Baik ),백경호 ( Kye Ho Baik ),박창현 ( Chang Hyun Park ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.2
Liquefied Natural Gas is liquefied at the condition of atmosphere pressure and cryogenic temperature. LNG is exposed very long time under the cryogenic temperature and high pressure, and it is very important to retain the structural safety in this envelopment. Until now, the material which are composing the storage tank of LNG ship has experimented at room temperature, so it is not enough to apply for the design at the cryogenic temperature. The purposes of this study are investigated mechanical properties for aluminum alloy. To evaluate tensile and fatigue test for aluminum alloy, it was considering static and fatigue conditions at room and cryogenic temperature. S-N curves were designed at both temperature respectively. Also, P-S-N curve was performed statistical method by JSME-S002.
열 노출에 의한 IN738LC의 기계적 특성 및 미세조직 변화
윤용근(Yong-Keun Yoon),김재훈(Jae-Hoon Kim),정동희(Dong-Hee Jeong),유근봉(Keun-Bong Yoo) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.10
니켈기 초내열합금은 높은 강도, 피로 및 산화 저항성이 우수하여 비행기 엔진, 선박 엔진 및 발전용 가스터빈 고온 부품 등을 만드는 소재로 오래전부터 사용되어 왔다. 본 연구에서는 가스터빈 블레이드 소재인 니켈기 초내열합금 IN738LC에 대하여 실제 운전환경과 유사한 조건을 설정하여 다양한 변형률 범위와 온도에서 인장시험을 수행하였다. IN738LC 소재를 871℃ 및 982℃ 에서 각각 1,000 ~ 10,000시간 동안 열 노출한 시편을 준비하여 기계적 특성 및 미세조직 변화를 관찰하였다. 기계적 특성 변화는 열 노출 시간에 따른 '의 변화와 관련된 것을 확인하였다. High-strength nickel-based super alloys have been widely used in aircraft engines, vessel engines, and turbine blades because of their high strength and excellent fatigue and oxidation resistance. In this study, tests were carried out to determine the total strain range and temperature for high-strength nickel-based super alloys. Prepared specimens of IN738LC were exposed to temperatures of 871℃ and 982℃ for 1,000?10,000 h. These specimens were subjected to tests of mechanical properties and microstructure observations. The changes in mechanical properties were related to changes in ' according to the thermal exposure time.
정동희,김재훈,윤용근,박준규,전경락,Jeong, Dong-Hee,Kim, Jae-Hoon,Yoon, Yong-Keun,Park, Joon-Kyoo,Jeon, Kyeong-Rak 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.1
The spacer grid is one of the main structural components in a fuel assembly. It supports fuel rods, guides cooling water and maintains geometry from external impact load and cyclic stress by the vibration of nuclear fuel rod, it is necessary to have sufficient strength against dynamic external load and fatigue strength. In this study, the mechanical properties and fatigue characteristics of laser beam welded zircaloy thin sheet are examined. The material used in this study is a zirconium alloy with 0.66 mm of thickness. The fatigue strength under cyclic load was evaluated at stress ratio R=0.1. S-N curves are presented with statistical testing method recommend by JSME- S002 and compared with S-N curves at R.T. and $315^{\circ}C$. As a result of the experimental approach, the design guide of fatigue strength is proposed and the results obtained from this study are expected to be useful data for spacer gird design.
실란화 몬모릴로나이트 캡슐과 기능성 소재를 충전한 하이브리드 고분자개질 방수아스팔트
이은주(Eun Ju Lee),윤용근(Yong Keun Yoon),임광희(Kwang-Hee Lim) 한국고분자학회 2020 폴리머 Vol.44 No.5
본 연구에서는 Na+로 양이온 교환시킨 몬모릴로나이트(montmorillonite, MMT)를 응집시키고, 이러한 응집체의 표면을 고분자개질 아스팔트와 상용성이 있도록 실란커플링제인 3-aminopropyltriethoxysilane(APS)로 표면을 개질시킨 실란화 MMT 캡슐을 기능성 소재로서 제조하였다. 또한 실란화 MMT 캡슐 내부에서 캡슐 외부표면보다 실란화가 적게 수행되는 실란화 MMT 캡슐 효과를 원소분석, FTIR, SEM, XRD 및 TGA 분석을 통하여 관찰하였다. 탄소섬유(2.5%)와 스테아릭산-코팅 탄산칼슘(2.5%)의 적정조성비를 가진 하이브리드 충전재가 첨가된 하이브리드 방수개질아스팔트(a), 및 탄소섬유(2.5%)와 실란화 MMT 캡슐(2.5%)의 하이브리드 충전재가 첨가된 하이브리드 방수개질아스팔트(b)의 경우에 모두, 기존 방수개질아스팔트와 다르게, 규격 KS F 3211의 인장강도, 파단신장률 및 인열강도의 요구조건을 모두 만족하였다. 한편, 하이브리드 방수개질아스팔트(b) 시편의 경우에는 투수저항의 한계수압은 0.5N/mm² 이상으로, 기존 방수개질아스팔트와 반대로 KS F 4935의 투수저항성 요구기준(i.e., 0.3 N/mm² 이상)을 만족시켰을 뿐 아니라, 0.4 N/mm²의 수압에서 투수가 된 하이브리드 방수개질아스팔트(a) 시편보다 우수한 자가보수(self-repair) 능력을 보였다. In this study, Na+-exchanged montmorillonite (MMT) was aggregated and subsequently the surface of the aggregates was modified by 3-aminopropyltriethoxysilane (APS) in order to be compatible with a polymer-modified asphalt. Thus, the modified MMT-aggregates were prepared, and silanized to be silanized MMT capsules. In addition, it was observed by elementary analysis, FTIR, SEM, XRD, and TGA that the degree of silanization inside the prepared silanized MMT capsules turned out to be remarkably less than that on the surface of the silanized MMT capsules. Both of hybrid waterproofing polymer-modified asphalt (a) filled with carbon fiber (2.5%) and stearic acid-coated CaCO₃ (2.5%) and hybrid waterproofing polymer-modified asphalt (b) filled with carbon fiber (2.5%) and the silanized MMT capsules (2.5%), satisfied all the requirements of tensile strength, elongation at break and tearing strength of KS F 3211 unlike a conventional waterproofing polymer-modified asphalt. In addition, in case of the specimen of hybrid waterproofing polymer-modified asphalt (b), its limiting water pressure of water penetration resistance was more than 0.5 N/mm² to show a very superb self-repairing ability and to satisfy the requirement of water pressure of water penetration resistance (i.e., 0.3 N/mm²) according to KS F 4935 unlike the conventional waterproofing polymer-modified asphalt, compared to that of hybrid waterproofing polymer-modified asphalt (a) which water penetrates even at the water pressure of 0.4 N/mm².