Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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An Analysis of the Fatigue Crack Opening Behaviour in the Welding Residual Stress Field by the Finite Element Method

압축잔류응력장을 전파하는 피로균열의 개구거동의 유한요소법을 이용한 해석적 검토

  • 박응준 (아주대학교 기계공학부) ;
  • 김응준 (한밭대학교 신소재공학부) ;
  • 유승현 (아주대학교 기계공학부)
  • Published : 2003.10.01
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Abstract

The finite element analysis was performed for the cracks existing in residual stress fields in order to investigate the effects of configuration of residual stress distribution to the fatigue crack opening behaviour. And the variation of stress distributions adjacent to the crack caused by uploading was examined. The finite element model with contact elements for the crack plane and plane stress elements for the base material and the analytical method based on the superposition principle to estimate crack opening behaviour and the stress distribution adjacent to the crack subjected to uploading were used. The results of the analysis showed that crack opening behaviors and variations of stress distribution caused by uploading were changed depending on the configuration of residual stress distribution. When the crack existed in the region of compressive residual stress and the configuration of compressive residual stress distribution were inclined, a partial crack opening just behind of a crack tip occurred during uploading. Based on the above results, it was clarified that the crack opening behaviour in the residual stress field could be predicted accurately by the finite element analysis using these analytical method and model.

Keywords

References

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