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스테인레스강 용접부의 피로균열 전파속도 예측에 관한 연구
이용복,정진성,박영근,김호경 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.3
Welding structure contains residual stress due to thermal-plastic strain during welding process, and its magnitude and distribution depend on welding conditions. Cracks initiate from various of the weldment, propagate and lead to final fracture. The crack initiation and propagation processes are affected by the magnitude and distribution. Therefore, the magnitude and distribution of weldment residual stress should be considered for safety design and service of welding structures. Also it is very important that more accurate assessment method of fatigue crack growth must take into account the redistributing the residual stress quantitatively, because the residual stress in weldment has characteristics of its redistribution with loading magnitude, number of cycles and fatigue crack propagation. In this study, fatigue crack behavior of STS-304 weldment was investigated during crack propagation into tensile residual stress region or compressive residual stress region. Crack growth rates were predicted and compared with experimental results.
SS330 용접재에서 재분포 압축잔류응력 및 균열닫힘의 영향을 고려한 피로거동에 관한 연구
이용복,정진성,김호경,조남익,박상흡 한국공작기계학회 1997 한국생산제조학회지 Vol.6 No.2
In this study effect of residual stress and its redistribution in weldment on the fatigue crack propagation was investigated. Fatigue tests were conducted by the center notched specimens machined with welded plate. The residual stress and its redistribution after the crack growth were measured by the magnetizing stress indicator and hole-drilling method. Fatigue crack propagation was estimated by the specimens having residual stress redistributed after the cracks growth and having the effects of crack closure. Crack growth rates were predicted and compared with experimental results. It had been found that the predicted crack propagations rates have a good agreement with experimental results when the redistribution of residual stress was considered.