A Study on Fatigue Behavior Considering Effects of Redistributing Compressive Residual Stress and Crack Closure in SS330 Weldment

SS330 용접재에서 재분포 압축 잔류응력 및 균열닫힘의 영향을 고려한 피로거동에 관한 연구

In this study residual stress in weldment was considered about the effect on the fatigue propagation and about the effect of redistribution of residual stress. Then, 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 propagation rates have a good agreement with experimental results when the redistribution of residual stress was considerd.