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정성기(S.K. Jung),오진근(J.G. Oh),전수환(S.H. Chun),문혁(H. Moon),명노신(R.S. Myong),조태환(T.H. Cho) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
Ice accretion on aircraft surface can greatly impair the aerodynamic performance of aircraft. As an alternative to the traditional Lagrangian particle tracking approach, an Eulerian-based droplet impingement and ice accretion code for air flows containing water droplets was developed. A CFD solver was also developed to solve the clean airflow. The results of present method were compared with experimental data and previous icing codes such as LEWICE and FENSAP-ICE and were confirmed to show good agreement each other in qualitative and quantitative ways.
Ti-(43-54)Al-xMn-yNb(x=0,3,4, y=0,4) 합금의 미세조직 및 변형거동 (1) : 미세조직 및 기계적 성질
표성규,김낙준,오진근 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.11
The main objective of the present paper is to study the effect of heat treatment and temperature on mechanical properties of Ti-(43-54)Al-xMn-yNb (x=0, 3, 4, y=0, 4) alloys. The compressive yield strength as well as fracture strain was correlated with composition, microstructure, tetragonality, and strain rate. The controlled microstructures obtained by heat treatments were introduced in order to correlate the microstructural parameters with mechanical properties. The variation behavior of compressive yield strength of Ti_(49)Al_(51) base alloys showed the positive temperature dependence and the highest compressive yield strength among the measured six alloys was obtained in (Ti_(49)Al_(51))_(92)Mn₄Nb₄. The c/a ratio of (Ti_(53)Al_(47))_(97)Mn₃ alloy was measured using hot stage in-situ XRD technique at different temperatures. The c/a ratio was decreased significantly at 1273K. The c/a ratio of Ti-(43-54)Al-xMn-yNb (x=0, 3, 4, y=0, 4) base alloys also varied with the compositions. The compressive fracture strain of Ti_(53)Al_(47) base alloys was increased with decrease of the c/a ratio, while Ti_(49)Al_(51) base alloys had no correlation with the c/a ratio.
초 고순도 TiAl 금속화합물의 미세조직 및 변형거동에 미치는 Al 조성의 영향
표성규,김낙준,오진근,Yamaguchi, M . 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.5
The present study is concerned with the effect of Al composition on the deformation behavior of ultra high pure (UHP) Ti-(48,50,52) at.%Al alloys using ultra high pure Ti with 30 wt. ppm oxygen. It is suggested that the deformation mechanism of UHP binary TiAl is strongly dependent on Al compositions. The deformation substructure of UHP Ti-48 at.%Al is shown to be dominated by ordinary dislocation with b = 1/2$lt;11 ̄0] as well as deformation twinning and small portion of 1/2$lt;112 ̄] superdislocation. Deformation mechanism in UHP Ti-50 at.%Al alloy consists of 1/2$lt;11 ̄0] type ordinary dislocation and 1/2$lt;112 ̄] superdislocation and a small portion of $lt;01 ̄1] superdislocation, but deformation twinning is not observed. Most of dislocation structure in UHP Ti-52 at.%Al alloy consisted of the faulted dipoles. Major deformation mode of UHP Ti-48 at.%Al and UHP Ti-50 at.%Al alloys was ordinary dislocation in deformation orientation, which take an advantage of ordinary dislocation slip. However, the major deformation of UHP Ti-52 at.%Al alloys was superdislocation slip in this orientation. It seems that there is little difference between major deformation mode of nominal purity TiAl and that of TiAl contained ultra low oxygen.