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윤한기(Han-Ki Yoon) 한국해양공학회 1999 韓國海洋工學會誌 Vol.13 No.2
As for the properties on both the aluminum and the CFRP which are used to make Al7075/CFRP multi-layered hybrid composites, CRALL(carbon reinforced aluminum laminate). In the CRALL specimen for rule of mixture, we were analyzed notched strength by finite element method. The results obtained from FEM analysis are as follows;<br/> In the unnotch CRALL specimen, the stresses imposed CFRP, epoxy, Al 7075 obtained by finite element method strength solution for A/C0001, when strain is 0.28%, are 1400 Mpa, 38 Mpa, 411 Mpa. respectively and for A/C9991, when strain 0.48%, are 392 Mpa, 26 Mpa and 321 Mpa, respectively. the slope of the stress-strain curve by FEM increases in keeping with the hole size and the yield strain decrease to 36% and 55% for A/C9993 and A/C9991 respectively.
Al 7075/CFRP 다적층 하이브리드 복합재료의 피로수명에 대한 연구
윤한기(Han-Ki Yoon),김연겸(Youn-Kyoum Kim),박준수(Joon-Soo Park),이경봉(Kyung-Bong Lee) 한국해양공학회 1996 韓國海洋工學會誌 Vol.10 No.4
In this research, to develope the Al 7075/CFRP multilayered hybrid composites, CRALL(Carbon Reinforced aluminum laminate) specimens were processed by autoclave curing system that curing temperature, time, surface pretreatment condition of aluminum were constant. And the fatigue life and failure mechanism on CFRP volume fraction and fiber orientation of CRALL specimens were investigated. A fatigue life was greatly influenced by effect of CFRP fiber volume fraction but it was less effected than those of fiber orientation. The fatigue failure arised from interface delamination of CFRP and aluminum sheet after shear fracture of aluminum layer. The failure mechanism is assumed that the aluminum laminates which divide the CFRP into many thin layers tend to arrest the failure propagation.
공유식,임만배,이상필,윤한기,오세규,Kong, Yu-Sik,Lim, Man-Bae,Lee, Sang-Pill,Yoon, Han-Ki,Oh, Sae-Kyoo 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.6
The high temperature creep behavior of heat machine systems such as aircraft engines, boilers and turbines in power plants and nuclear reactor components have been considered as an important and needful fact. There are considerable research results available for the design of high temperature tube materials in power plants. However, few studies on the Initial Strain Method (ISM) capable of securing repair, maintenance, cost loss and life loss have been made. In this method, 3 long time prediction Of high temperature creep characteristics can be dramatically induced through a short time experiment. The purpose of present study is to investigate the high temperature creep lift of Udimet 720, SCM 440-STD61 and 1Cr-0.5Mo steel using the ISM. The creep test was performed at 40$0^{\circ}C$ to $700^{\circ}C$ under a pure loading. In the prediction of creep life for each materials, the equation of ISM was superior of Larson-Miller Parameter(LMP). Especially, the long time prediction of creep life was identified to improve the reliability.
고온용 SiC<SUB>f</SUB>/SiC 복합재료개발 기술과 활용방향
윤한기(Han Ki Yoon),이영주(Young Ju Lee),박이현(Yi Hyun Park) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.11
The development of the first wall whose major function is to withstand high neutron and heat fluxes is a critical path to fusion power. The materials database and the fabrication technology are being developed for design, construction and safety operation of the fusion reactor. The first wall was designed to consist of the plasma facing armor, the heat sink layer and the supporting plates. and Porous materials are of significant interest due to their wide applications in catalysis, separation, lightweight structural materials. In this study, the characteristics of the sintering process of SiC ceramic, SiCf/SiC composite and porous Cf/SiC composite have been introduced order to study of the fusion blanket materials and heat-exchange pannel.
Nb/MoSi<sub>2</sub>적층복합재료의 제조 및 파괴특성
이상필,윤한기,Lee, Sang-Pill,Yoon, Han-Ki 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.6
The impact value, the interfacial shear strength, the tensile strength and the fracture strain of Nb/MoSi$_2$laminate composites, which were associated with the interfacial reaction layer, have been investigated. Three types of Nb/MoSi$_2$ laminate composites alternating sintered MoSi$_2$ layers and Nb foils were fabricated as the parameter of hot press temperature. The thickness of interfacial reaction layer of Nb/MoSi$_2$ laminate composites increased with increasing the fabrication temperature. The growth of interfacial reaction layer increased the interfacial shear strength and led to the decrease of impact value in Nb/MoSi$_2$ laminate composites. It was also found that in order to maximize the fracture energy of Nb/MoSi$_2$ laminate composites, interfacial shear strength and the thickness of interfacial reaction layer must be secured appropriately.
Nb/MoSi<sub>2</sub> 접합재료의 계면 수정 및 특성
이상필,윤한기,Lee, Sang-Pill,Yoon, Han-Ki 대한기계학회 2003 大韓機械學會論文集A Vol.27 No.7
This study dealt with the suppression of interfacial reaction between Nb and MoSi$_2$ for the fabrication of high toughness Nb/MoSi$_2$ laminate composites, based on the results of a thermodynamical estimation. Especially, the effect of ZrO$_2$ particle on the interfacial reaction of Nb/MoSi$_2$ bonding materials has been examined. Nb/MoSi$_2$ bonding materials have been successfully fabricated by alternatively stacking matrix mixtures and Nb sheets and hot pressing in the graphite mould. The addition of ZrO$_2$ particle to MoSi$_2$ matrix is obviously effective for promoting both the interfacial reaction suppression and the sintered density of Nb/MoSi$_2$ bonding materials, since it is caused by the formation of ZrSiO$_4$ in the MoSi$_2$-ZrO$_2$ matrix mixture. The interfacial shear strength of Nb/MoSi$_2$ bonding materials also decreases with the reduction of interfacial reaction layer associated with the content of ZrO$_2$ particle and the fabrication temperature.
윤한기(Han Ki Yoon),이진경(Jin Kyung Lee),오정석(jung Seok Oh),손수정(Soo Jung Shon),H. Takanashi 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5
This work is to scope potentiality of solid state bonding for SiC and W and to define key mechanism to make high temperature components satisfy their requirements. The preliminary result indicated the potential of the method as fabrication process of SiC and W high temperature system component. In this study, we investigate the microstructure mechanism, two types of reaction layer between W and SiC of interphase structure.
자동차용 경량화 AI/CFRP 하이브리드 복합재료의 굽힘강도 특성
윤한기(Han-Ki Yoon),이경봉(Kyung-Bong Lee) 한국자동차공학회 2002 한국자동차공학회 지부 학술대회 논문집 Vol.2002 No.3
Al/CFRP Hybrid composites by using automobile were made with alternating Al7075 sheets and CFRP preparers by autoclave co-curing process. There are many factors influencing the performances of the laminate. We made it changing volume fraction and fiber orientation of CFRP. In this paper, 3-point bending test was conducted to investigate the influence of volume fraction and fiber orientation of CFRP on Bending strength characteristics.<br/>