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허선철(Sun-Chul Huh),김귀남(Gwi-Nam Kim),박준성(joun-sung Park),최부영(Boo-Young Choi),박원조(Won-Jo Park) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-3
Fracture toughness is an important parameter in designing structure applied in low temperature. The huge tesging machine and manufacturing of the testing specimen are the main shortages of the CTOD and FCG testing methods. Therefore, in this study the indentation tester AIS 3000 is applied to measure the fracture toughness. The experiment was conducted at RT, 0℃, -20℃ and -45℃, respectively. Furthermore, the fracture surface was observed by SEM. Through the results we can see that the fracture toughness was reducing through the temperature drop, and the highest fracture toughness in base metal and weld zone was measured at room temperature though there were a little peak at -20℃. As we expected, the highest fracture toughness in th HAZ was observed at -20℃ for procedding less brittle fracture at low temperature.
ANSYS를 이용한 EH36강 용접부의 잔류응력 해석에 관한 연구
이종석(Jong-Seok Lee),정영선(Yeong-Seon Jeong),김귀남(Gwi-Nam Kim),박준성(Joun-Sung Park),박원조(Won-Jo Park),허선철(Sun-Chul Huh) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
Today, a ship and structure are becoming larger (such as large structures, vessels, FPSO, etc.). So, weld material is required to high strength. Welding has advantages depending on the development of welding technology, such as ease of operation and the structures of simplification and the confidential excellence, etc. But it has occurred to shrinkage and deformation, because of the repeat of heating and cooling. Welding residual stress has an adverse effect on stability. Also, fatigue and brittle fracture of structures are closely related. In this study, Experimental and analytical methods were conducted. measured residual stress by using the AIS3000 and compare with the results of analysis by using the ANSYS simulation. Observed microstructure of metal surface at various positions of weld, HAZ, and base metal by using the optical microscope, EPMA. and Ingredients analyzes using XRD. Next compare with changes to the strength and weld residual stress.
압업시험기를 이용한 후판용접재의 잔류응력 분포에 관한 연구
허선철(Sun-Chul Huh),김귀남(Gwi-Nam Kim),이종석(Jong-Seok Lee),박철홍,박준성(Joun-Sung Park),박원조(Won-Jo Park) 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.6
Recently, the production at shipbuilding and offshore plant industries, with a trend toward large structures, has led to an increased use of high strength ultra-thick plates. The use of ultra-thick plates increases the welding tasks, and the welding process generates distortion and residual stress in the weldment because of the rapid heating and cooling. Welding distortion and residual stress in the welded structure resulte in many troubles such as deformation and life deterioration. In particular, the welding residual stress has an important effect on welding deformation, fatigue, buckling strength, brittleness, etc. The purpose of this study was to evaluate the residual stress at a multi-pass weldment using an experimental method for EH36 high-tension steel. In this experimental method, AlS3000 was used to measure the residual stress of a welded part, HAZ, and base metal; EPMA and XRD were used to study the material properties.