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유형주(Hyoung-Ju Ryu),박경동(Keyung-Dong Park) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
In this study, the influence of compressive residual tress and corrosive condition for corrosion fatigue crack was investigated, after immersing in 3.5%NaCl, 10%HNO₃+3%HF, 6%FeCl₃. The immersion period was performed 90days. The fatigue characteristics investigation of a spring steel processed shot peening is performed by considering the several corrosion environments in the range of stress ratio of 0.05 by means of opening mode displacement. By using the methods mentioned above, the following conclusions have been drawn: The fatigue life shows more improvement in the shot peened material than in the un peened material.
박경동(Keyoung-Dong Park),유형주(Hyoung-Ju Ryu) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
The security of stability for fracture of all sorts of parts and structure has become a first subject in this days. We have need to organize fatigue characteristics of weldment because fatigue break out suddenly without a change of shape. In this study, we execute the fatigue test according to changes the welding method and weldment at the same materials. It was investigated about fatigue limit according to welding methods of SMAW, FCAW and SAW and to weldment of CASE 1, 2, 3 at the normal temperature and frequency 10㎐. The important results of the experimental study on fatigue characteristics of weld are as follows: The fatigue limit of welding methods was low in the order of SMAW, FCAW, SAW. The fatigue limit of weldment of materials that CASE 1 was determined to the low than CASE 2, CASE 3. The CASE 2 putting the interval of the 2mm creates back plate and make fatigue limit to high.
박경동(Keyung-Dong Park),유형주(Hyoung-Ju Ryu) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
The lightness of components required on marine and shipbuilding 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. In this study, it was investigated about endurance and fatigue crack propagation rate of according to stress ratio of SMAW commonly using for welding structures in present. Fatigue crack propagation rate(da/dN) of low load(R=0.1) was lower than of high load(R=0.6) for piping weld. And in stage Ⅰ, △Kth, the threshold stress intensity factor of the weld under heavy load is higher than under small load. Fatigue life shows more improvement in the weld of stress ratio R=0.1 than in the weld of stress ratio R=0.6.