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RISS 인기검색어
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- 저자 : 진영범(Young-Beom Jin) (검색결과 6 건)
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진영범(Young-Beom Jin),박경동(Keyung-Dong Park) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Antifatigue failure technology take an important the part of current industries. Currently, the shot peening is used for removing the defect from the surface of steel and improving the fatigue strength on surface. Therefore in this paper the effect of compressive residual stress by shot peening on fatigue crack growth characteristics in stress ratio(R=0.05)was investigated with considering fracture mechanics. There is difference between shot peening specimen and unpeening specimen. Fatigue crack growth rate of shot peening specimen was lower than that of unpeening. Fatigue life shows more improvement in the shot peening material than in th unpeening material. And compressive residual stress of surface on the shot peening process operate resistance force of fatigue propagation.
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진영범(Young-Beom Jin),박경동(Keyung-Dong Park) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Recetly the steel parts used for automiles and trains are required to be used under higher stress than ever before in need of the weight down. However, there are a lot of problems with developing such materials that require expensive tools, and a great deal of time and effort. Therefore, the improvement of fatigue strength and fatigue life are mainly focused on by adopting residual stress. And got the following characterisics from crack growth test carried out stress ratio. Fatigue life shows more improvement in the Un-peening material. And compressive residual stress of surface on the Shot-peening processed operate resistance force of fatigue. So we cam obtain fallowings. (1) The fatigue crack growth rate on stage Ⅱ is conspicuous with the size of compressive residual stress and is dependent on Paris equation. (2) Although the maximum compressive residual stress is deeply and widely formed from surface, fatigue life does not improve than when maximum compressive residual stress is formed in surface. (3) The threshold stress intensity factor range is increased with increasing compressive residual stress.
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현가장치용 SUP-9강의 피로파괴에 미치는 압축잔류응력의 영향
박경동,진영범,Park, Kyoung-Dong,Jin, Young-Beom 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.3
The lightness of components required in automobile and machinery industry is requiring high strength of components. In particular, fatigue failure phenomena, which happen in metal, bring on danger in human life and property. Therefore, antifatigue failure technology takes an important part of current industries. Currently, the shot peening is used for removing the defects from the surface of steel and improving the fatigue strength on surface. Therefore, in this paper the effect of compressive residual stress of spring steel(JISG SUP-9)by shot peening on fatigue crack growth characteristics in stress ratio(R=0 1, R=0 3, R=0 6)was investigated considering fracture mechanics. By using the methods mentioned above, I arrived at the following conclusions: (1) The fatigue crack growth rate(da/dN) of the shot peening material was lower than the unpeening material And in stage I, ${\Delta}K_{th}$, the threshold stress intensity factor, of the shot peening material is high in critical parts unlike the unpeening material. (2) Fatigue life shows more Improvement in the shot peening material than in the unpeening material. And compressive residual stress of surface on the shot peening processed operate the resistance of fatigue crack propagation.
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석유시추용 인코넬 625강의 FCAW 용접에 관한연구 ; 보호가스 변화가 기계적 성질에 미치는 영향
박경동(KEYUNG-DONG PARK),진영범(YOUNG-BEOM JIN),박형동(HYOUNG-DONG PARK) 한국해양공학회 2004 韓國海洋工學會誌 Vol.18 No.6
Inconel 625 is useful in a variety of industrial applications because of the resistance to attack in various corrosive media at temperatures from 200℃ to over 1090℃, in combination with good low and high temperature mechanical strength. Rencently this material has also been widely used in offshore processing piping in order to extend the maintenance term and improve the quality of anti-corrosion. In general, high quality weldings for this material are readily produced by commonly used processes. How, not all processes are applicable to this material group of Ni-alloys. Metallurgical or the unavailability of matching, position or suitable welding processes produce a lower quality. Nowadays, the flux cored wire is developed and applied for increased productivity in several welding positions, including the vertical position. In this study, the weldability and weldment characteristics(mechanical properties) of inconel 625 are considered in FCAW(Flux Core Arc Welding) associated with the several shielding gases(80%Ar+20%CO2, 50%Ar+50CO2, 100CO2) in view of welding productivity.
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쇼트피닝 가공된 해양구조용강의 피로파괴에 미치는 응력비의 영향
박경동(KYOUNG-DONG PARK),진영범(YOUNG-BEOM JIN),박형동(HYOUNG-DONG PARK) 한국해양공학회 2004 韓國海洋工學會誌 Vol.18 No.5
The lightness of components required in the automobile and machine industry necessitates the use of high strength components. In particular, the fatigue failure phenomena, which occurs when using metal, increases the danger to human life and property. Therefore, antifatigue failure technology is an integral part of current industries. Currently, the shot peening is used for removing the defect from the surface of steel, while improving the fatigue strength on surface. Therefore, in this paper, the effect of compressive residual stress of spring steel(JISG SUP-9) by shot-peening on fatigue crack growth characteristics in a stress ratio(R=0.1, R=0.3, R=0.6) was investigated, giving consideration to fracture mechanics. By using the methods mentioned above, following conclusions are drawn:<br/> (1) The fatigue crack growth rate(da/dN) of the shot-peening material was lower than that of the un-peening material and in stage Ⅰ, ΔKth, the threshold stress intensity factor of the shot-peen processed material is high in critical parts, unlike the un-peening material. Also m, fatigue crack growth exponent and number of cycle of the shot-peening material, was higher than that of the un-peening material, as concluded from effect of da/dN.<br/> (2) Fatigue life shows more improvement in the shot-peening material than in the un-peening material, and the compressive residual stress of surface on the shot-peen processed operate resistance of fatigue crack propagation.
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