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강관의 하이드로포밍시 성형구간과 공정인자에 대한 실험적 연구
안익태(I. T. An),현도익(D. I. Hyun),김봉준(B. J. Kim),문영훈(Y. H. Moon) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.4
Tube hydroforming has attracted increased attention in the automative industry recently. It can produce wide range of products such as subfrarnes, engine cradles, and exhaust manifolds with cheaper production cost by reducing overall number of processes. The purpose of this study is to trace cause of these forming failure and to make optimal process condition. Expermental studies have been performed to investigate the effects of each parameters such as internal pressure, axial feeding and holding time. Tubes used in the experiment are SPS290 and SAPH38P. In case of the T-fitting bulge height at initial process, middle process and last process are investigated and then compared. In the cylindrical hvdroforming the effect of holding time has been observed.
탄소강 후판용접부의 피로수명 및 잔류응력에 미치는 열처리 영향
안익태 ( I. T. An ),김원태 ( W. T. Kim ),조종래 ( J. R. Jo ),문영훈 ( Y. H. Moon ) 한국열처리공학회 2003 熱處理工學會誌 Vol.16 No.3
N/A The effects of heat treatment on the fatigue life and welding residual stress of welded plates were investigated in this study. The plates were welded by flux cored are welding process, and post weld heat treated at 600℃ for 1 hour. The residual stresses of welded plates before and after post weld heat treatment were measured by hole drilling method. To measure the fatigue life of welded plates, low cycle fatigue tests under strain control and high cycle fatigue tests under load control were performed respectively, by using cylindrical specimens containing weld metal and heat affected zone. The obtained result shows that the post weld heat treatment reduces the residual stress, and resultantly changes the fatigue life of welded plate. Goodman diagrammatic analysis has also been performed to study the effect of post weld heat treatment on the high cycle fatigue life.