Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Numerical Analysis and Experimental Verification of Relaxation and Redistribution of Welding Residual Stresses

용접잔류응력의 이완과 재분포 해석 및 실험적 검증

  • Song, Ha-Cheol (Research Institute of Marine Systems Engineering, Seoul National University) ;
  • Jo, Young-Chun (Dept. of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Jang, Chang-Doo (Dept. of Naval Architecture and Ocean Engineering, Seoul National University)
  • 송하철 (서울대학교 해양시스템공학연구소) ;
  • 조영천 (서울대학교 조선해양공학과) ;
  • 장창두 (서울대학교 조선해양공학과)
  • Published : 2004.12.01
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Abstract

For the precise assessment of the effect of welding residual stresses on structural strength and fatigue crack growth behavior, new FE analysis algorithms for the estimation of residual stress relaxation due to external load and redistribution due to fatigue crack propagation were proposed in this paper. Initial welding residual stress field was obtained by thermal elasto-plastic analysis considering temperature dependent material properties, and the amount of residual stress relaxation and redistribution were assessed by subsequent elasto-plastic analysis In the analysis of fatigue crack propagation, the applied SIF(Stress Intensity Factor) range was evaluated by $\frac{1}{4}$-point displacement extrapolation method, and the effect of welding residual stresses on crack propagation was considered by introducing the effective SIF concept. The test results of crack propagations were compared with the predicted data obtained by the analysis.

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References

  1. 강성원, 김영욱, 김화수, 김도현, 2001, 'Padding plate 용접구조의 인장 정하중 이력에 의한 용접잔류응력 변화 및 피로강도에의 영향,' 대한조선학회 논문집, 제 38 권, 제 4 호, pp.75-82
  2. 송하철, 2001, 국부가열을 이용한 관통균열을 가진 강판의 피로수명 연장에 관한 연구, 공학박사학위논문, 서울대학교
  3. 이상갑, 이윤기, 김화수, 김도현, 1999, '잔류응력이 피로수명에 미치는 영항,' 대한조선학회 춘계학술대회 논문집, pp. 390-393
  4. 이용복, 정진성, 1997,' 용접재의 잔류응력 재분포와 피로거동,' 대한용접학회지, 제 15 권, 제 3 호, pp. 20-28
  5. 전유철, 김유일, 강중규, 한종만, 2001, ' 피로실험 및 균열진전 해석을 통한 용접부의 피로수명 예측에 관한 연구,' 대한조선학회 논문집, 제38 권, 제 3 호, pp. 93-106
  6. Barsoum, R.S., 1977, 'Triangular Quarter-Point Elements in Linear Fracture Mechanics,' International Journal of Numerical Methods in Engineering, Vol. 11, pp 85-98
  7. Fett, T. and Munz, D., 1997, Stress Intensity Factors and Weight Functions, Computational Mechanics Publications
  8. Jang, C.D. and Lee, C.H., 2003, ' Prediction of Welding Deformation of Ship Hull Blocks,' Journal of Ship & Ocean Technology, Vol.7,No.4,pp.41-49
  9. Jang, C.D., Song, H. C. and Lee, C.H., 2002, ' Fatigue Life Extension of a Through Thickness Crack Using Local Heating,' International Journal of Offshore and Polar Engineering, Vol. 12, No.3, pp. 223-228
  10. Stephens, R.I., Fatemi,A., Stephens, R.R. and Fuchs, H.O., 2001, Metal Fatigue in Engineering, 2nd ED, Wiley Inter-Science, pp. 156-157