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허용학(Yong-Hak Huh),김동진(Dong Jin Kim),이해무(Hae Moo Lee),홍성구(Sung Gu Hong),박준협(Jun Hyub Park) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.10
Fatigue limit of the copper film coated by Sn was estimated using Goodman diagram and Gerber diagram. To obtain the high cycle fatigue life curve, S-N curve, of the film, the high cycle fatigue test was carried out by applying the constant amplitude load to the film specimen with three different stress ratio of 0.05, 0.3 and 0.5 and the frequency of 40 ㎐ at room temperature in air. The free-standing film specimen 15.26㎛ thick was fabricated by etching process. The fatigue limits and S-N curves at the respective stress ratios were determined from the experimental works. It was shown that the S-N curves were dependent on the stress ratio and the fatigue limit was increased with decreasing the stress ratio. The dependency of the fatigue behavior was presented in empirical relationship. Using these relationships, the fatigue limit was predicted.
자동차용 고장력강 DP590의 인장 및 저되풀이수 피로물성 평가
구자석(Ja-Suk Koo),최재석(Jae-Seock Choi),전태룡(Tae-Ryong Jeon),허용학(Yong-Hak Huh),이해무(Hae-Moo Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
Tensile and low cycle fatigue properties of high strength steel DP590 used for automotive chassis parts are evaluated. Test specimens are made of DP590 plate after painting and baking process. Load cell calibration, extensometer calibration and specimen alignment are performed to enhance the accuracy and precision. In addition, the guiding apparatus is made in order to prevent buckling when compression loading is present. When DP590 replaces SAPH370, the fatigue life of the lower control arm increases by 2 or 3 times.
許容茂 단국대학교 대학원 1987 學術論叢 Vol.11 No.-
The primary purpose of the present study is to inquire into the learning attitude of technocrats through housing policy instrument adopted in our country after the Park regime, find out its restrictive factors, if any, and to retrospect the background of our public policy. Even though there has been some difference to a certain extent in major policy strategy after the Park regime, the exportoriented policy for high economic growth has been persistently followed ever since. In the strict since, there has been almost no major national policies which are not closely related to the enlargement for export performance for economic development.Such economic growth powth has also affected seriously the housing policy which was once considered to be implemented without being influenced significantly by the overseas sector. Consequently it has actually resulted in the alteration of the housing policy along with the changes of the international and domestic situations. During the worldwide deprssion after the oil crisis which our country unexceptionally experienced twice, the government modified its housing policy in order to enliven domestic economic activities. Thus the housing policy was used as perkup instrument, because housing itself has the nature of a compound property, which is relatively free from being affected by the overseas sector, and is an object of social concern. This instrumental nature of the housing policy, has been persistently appeared since the Yushin (Revitalizing Reform) period was put an end. This can be seen from the fact that the rate of enticyclical change was 33%100% during the period. The technocrats played an active role in using the housing policy as an instrument of business buoyance and its results were recognized. Therefore it seems that the technocrats have learned much in the course of the repeated employment of such policy instrument in the midst of countercycle. However, judging from the fact that the rate of anticlyclical change during the periods of 19721974 and 19781980 when the world economy showed a downward trend, was zero percent, the effectiveness of the policy instrument expected earlier may be considered negligible. This suggests that the changes in policy style and world economy are the factors that strongly restrict the learning ability of the technocrats.
이주진,이해무,남승훈,허용학,전승범 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.10
In order to evaluate the life of steam turbine blade, information of the crack initiation at corrosion pits and the crack growth is needed. Corrosion pits are made artificially on the specimens machined from the real turbine blades(12% Cr steel) and specimens are tested to study the small crack initiation and growth. Difference between the small cracks and the long cracks is made by the crack growth behavior and the size of small cracks is 700∼800㎛ equivalent to 14∼18 times of grain size. The formation fife of these small cracks reveals 80∼90% of total fatigue life and those life with smaller applied stress shows larger portion of total life than that of larger stress.