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Fatigue Crack Growth Behavior in Ultrafine Grained Low Carbon Steel
Ho,Kyung Kim,Myung-Il Choi,Chin-Sung Chung Dong-Hyuk Shin 대한기계학회 2002 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.16 No.10
Ultrafine grained (UFG) low carbon (0.15 wt.% C) steel produced by equal channel angular pressing (ECAP) was tested for investigating the effect of load ratio on the fatigue crack growth rate. Fatigue crack growth resistance and threshold of UFG steel were lower than that of as-received coarse grained steel. It was attributed to the less tortuous crack path. The UFG steel exhibited slightly higher crack growth rates and a lower △K_th with an increase of R ratio. The R ratio effect on crack growth rates and △K_th was basically indistinguishable at lower load ratio (R>0.3), compared to other alloys, which indicates that contribution of the crack closure vanishes. The crack growth rate curve for UFG steel exhibited a longer linear extension to the lower growth rate regime than that for the coarse grained as-received steel.<br/>
저온에서의 자연철의 Mo¨ssbauer Spectra 硏究
朴冠鎬,李敬行,金振璜 동국대학교 1985 論文集 Vol.24 No.-
Mo¨ssbauer parameters of natural iron have been measured from 25K to 298K. The isomer shift was not linear with absolute temperature, except at high temperature, because of quantized lattice levels. We have obtained the Debye and einstein temperature by fitting the kinetic temperature proposed by Mazo and Kirwood. We have found out the following results; 1) Isomer shift values tend to increase, while temperature decrease. 2) Hyperfine splitting values tend to increase, while temperature decrease. 3) Debye temperature is 264 K. 4) Einstein temperature is 202 K.
차경준,진정언,황선호 漢陽大學校 自然科學硏究所 2001 自然科學論文集 Vol.21 No.-
본 논문에서는 R/S(Rescaled range)통계량을 어느 한 시계열에 대하여 누적편차를 이용하여 정의할 때, Hurst 지수측정에서 최소한의 필요한 데이터수는 N=2^10이며, 합당한 lag는 2^3 으로서 가능할 수 있음을 제안한다. In this study, in R/S(rescaled range) statistic by using cumulative deviation for one time series, we suggest that the minimum number of data in estimating Hurst Exponent is N=2^10 and the suitable length of lag is 2^3
정진성,이찬우,김호경 서울産業大學校 1999 논문집 Vol.50 No.2
The bogie frames mainly fabricate 9㎜ thick rolled steels and sometimes fatigue cracks occur in their welded joints due to inadequate fatigue design and poor weld quality. The objective of this study is to present the systematic procedure of the fatigue durability estimation and the remaining life prediction for diesel locomotive bogie frame weldments. In order for prediction of remaining fatigue lifetime, service stresses were measured at critical points, using strain gages, during field tests under several rail-roading conditions. It was found that the systematic procedure presented in this study could be applied practically to the fatigue analysis for the locomotive bogie frame weldments.
朱京在,李好璡,尹弘澤,서치호 건국대학교 1982 學術誌 Vol.26 No.2
In general most of structure in our country, has steel of SBD 24 combining 180kg/cm2 or 210kg/cm2 of standard compressive strength of concrete. When we consider economical design in structural and practical operation, this paper has estimated steel quantities by combining the design standard strength of steel with those of concrete in reinforced concrete building which has four stories for office and then compared each other. As a result of comparing the quantities of steel according to their combination, it has searched for which combination has consumed less steel and become economic.
韓相謙,朱京在,李好璡 건국대학교 1979 學術誌 Vol.23 No.2
Recent change of our rural environment is very rapid and living environment of rural inhabitants should be ceaselessly improved to keep pace with their increasing income and requirements . Basic unit village is the most essential living zone to human beings, which can make change in living pattern. To suggest reasonable unit village relocation plan, following 3 villages were selected as pilot projects ; 1)Duckpyong-ri, Majang-myon, Ihchon-kun, Kyonggi-do. 2)Bon-dong, Homyong-myon, Yechon-kun, Kyongsang-pukdo. 3)Dosan-ri, Kochang-eup, Kochang-kun, Chulla-pukdo. In planning process of these 3 villages, it is emphasized that ; 1)To keep tradition of Korean rural area and economic efficiency by sufficient application of natural land formation. 2)Most housing sites are relocated to higher places for the improvement of housing environment and enlargement of farm land. 3)Street flow lines are planned along the curved contour line to express Korean traditional road line. 4)Site location keeps certain height difference, if possible, for good view, ventilation and application of sun shine. 5)Location of annex buildings for farm using is separated from dwelling units to make better living environment. 6)To give variations in community, size of housing site is prepared within range from 265 m2 (80 pyong) to 395 m2 (120 pyong). 7)To exclude monotoneous mood from continuously located housing site, some green areas are provided at several spots between curved road line and steeply sloped housing lot. 8)To install athletic field and play groung for children, open spac s are reserved as much as possible.
진경호(Kyung-Ho Chin),한재구(Jae-Goo Han),박환표(Hwan-Pyo Park) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
Recently, international LNG plant construction market is continuously expending. In order to this market, Project management skill is essential to secure as well as design and construction techniques. This research was intended to draw the structured decision-making process with states-gate model in LNG plant EPC phases. And this research has suggested the decision support logic to development the Decision Support System for project management in LNG plant.