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

SS330 용접재에서 재분포 잔류응력 및 균열닫힘영향을 고려한 파로거동에 관한 연구

  • 이용복 (홍익대학교 기계공학과) ;
  • 정진성 (홍익대학교 대학원 기계공학과) ;
  • 조남익 (전주공업전문대학 기계과)
  • Published : 1996.07.01

Abstract

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.

Keywords

Residual Stress Intensity Factor;Residual Stress Redistribution;Effective Stress Ratio;Magnetizing Stress Indicator;Applied Stress;Crack Closure