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압력용기용 A516강의 저온피로크랙전파특성에 관한 연구
박경동(Kyung-Dong Park),노태영(Tae-Young Ro),김영대(Young-Dae Kim),김형자(Hyung-Ja Kim),손재윤(J-Y Son) 한국해양공학회 1999 韓國海洋工學會誌 Vol.13 No.3(Ⅰ)
In this study, CT specimens were prepared from ASTM A5l6 Gr. 65 which was used for pressure vessel plates for moderate and lower temperature service. Fatigue crack growth test was carried out in the environment of low temperature of 10℃, -10℃, -30℃ and -50℃ and in the range of stress ratio of R=0.05 and 0.3 by means of opening mode displacement<br/> Based on these test results, the characteristics from temperature and stress ratio were shown as follows.<br/> 1) As the stress ratio, R increased da/dN and ΔK of 2nd stage gradually decreased. And as R decreased, the effect of temperature became greater and greater.<br/> 2) As the temperature descended, da/dN decreased on a certain ΔK, and ΔK did in a same da/dN. And the stress ratio, R exerted greater influence at the lower temperature.<br/> 3) The fatigue crack growth constant, m increased at 10℃ and -10℃, and decreased at -30℃ and -50℃ following the increment of stress ratio R. And m increased along with the reduction of temperature greatly decreased at -30℃ to come close to two(2).
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Channe形 構造用材에 對한 純粹剪斷 Rolling 加工法의 應用
盧泰瑛 釜山工業大學校 1981 論文集 Vol.22 No.1
A new shear rolling method for deformation of metals was utilized to manufacture the channel-shaped beam structure. The process is very similar to shear of cones and instead of rotating mandrel, the reciprocating die is used to this process. Commercially pure alluminium blank was tested to demonstrate the process. Tangential force was measured by using tool dynamometer and was compared with theoretical solution based on simple shear deformetion. Good qualtative agreement exists between theory and experiments.
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盧泰瑛 釜山工業大學校 1995 論文集 Vol.37 No.-
Finite element techniques are applied to real weld shapes to derive hydrogen concentration curves. Results form the basis for an evaluation of post weld heat treatment in terms of hydrogen dispersal from welds. It is found that any chosen level can be reached after welding by maintaining postheat for a period which may be calculated from the finite element results. and welds requiring stress relief heat treatment will incur some risk of cracking if allowed to cool to ambient between completion of welding and application of the heat treatment. The mandatory stress relief heat treatments are sufficient to lower hydrogen concentrations to less than 10% of that present initially.
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김현자,최현철,김영대,김일선,노태영,이규용 釜慶大學校 2001 釜慶大學校 論文集 Vol.6 No.-
Thin film of TiAlN was deposited onto ISO P20 tungsten carbide cutting insert tip substrate specimen using the FVAS (filtered vacuum arc system) at the substrate temperature of 80℃. Cutting and wear tests have been performed to the TiAlN coated and uncoated WC specimen, respectively under the same cutting conditions for the comparison. Cutting forces and tool wear of coated and uncoated carbide cutting tools were investigated by means of cutting length and cutting forces. Also tool wear and tool life were analyzed using the 3ch tool dynamometer amp lifier and oscilloscope. In this study cutting tests for the cutting performance of TiAlN coated WC-Co P20 to the steel alloy of SNCN420 have been curried out. Through the comparisons of cutting forces during the cutting tests and tool wear, we got the conclusions as follows.; ① In usual cutting conditions, main cutting force component showed higher value than the thrust force normal to the cutting direction especially cutting forces in the of early stage on cutting tests. But, after loosing the protective hard thin film on substrate or insert tip, the thrust force normal to the cutting direction showed much higher than main cutting force component. ② Within the range of 0.3㎜ build up edge in P20 insert tip, TiAlN coated tip was evaluated more stable in flank wear and less in crater wear than the uncoated specimen. ③ Through the wear growth curve of the specimen, tool life differences of uncoated and TiAlN coated tip at high speed (V=250[m/min]) was higher than the low speed(V=200[m/min]) case, compared to the average but the tool wear was almost same in both specimen for the case of normal wear occurred.
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