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Creep-Fatigue Crack Growth at CrMo Steel Weld Interface

CrMo강 용접계면균열의 크리프-피로 균열성장거동

  • 백운봉 (한국표준과학연구원 산업측정표준부) ;
  • 윤기봉 (중앙대학교 기계공학부) ;
  • 이해무 (한국표준과학연구원 산업측정표준부) ;
  • 서창민 (경북대학교 기계공학부)
  • Published : 2000.12.01

Abstract

Creep-fatigue crack growth behavior was experimentally measured particularly when a crack was located in the heat affected region of lCr-5Mo steel. Load hold times of the tests for trapezoidal fatigue waveshapes were varied among 0, 30, 300 and 3,600 seconds. Time-dependent crack growth rates were characterized by the $C_r$parameter. It was found that the crack growth rates were the highest when the crack path was located along the fine-grained heat affected zone(FGHAZ). Cracks located in other heat affected regions had a tendency to change the crack path eventually to FGHAZ. Creep-fatigue crack growth law of the studied case is suggested in terms of (da/dt)$_{avg}$ vs. ($C_t$)$_{avg}$ for residual life assessment.

Keywords

References

  1. 윤기봉, 김광웅, 백운봉, 1998, '저합금강 용접부의 크리프 균열성장거동 모델링,' 대한기계학회논문집 A권, 제22권, 제12호, pp. 2153-2162
  2. 윤기봉, 심현우, 신영의, 1998, '고온크리프 조건에서 용접계면 균열의 Ct 매개변수에 대한 수치해석적 연구,' 대한기계학회논문집 A권, 제22권 제12호, pp. 2239-2246
  3. Sexena, A., Cretegny, L., Grover, P.S. and Norris, R.H., 1998, 'Modeling of Fracture and Crack Growth in Weld Operating at High Temperature,' Proceedings of Int. HIDA Conference, Paris, France 15-17 April
  4. 백운봉, 이해무, 2000, 99 시설안전 계측 기술 개발사업 연구 8장, 한국표준과학연구원, KRISS/IR 2000-014
  5. Saxena, A., 1980, 'Electrical Potential Technique for Monitoring Subcritical Crack Growth at Elevated Temperature,' Engineering Fracture Mechanics, No. 13, pp. 741-750 https://doi.org/10.1016/0013-7944(80)90005-3
  6. Johnson, H. H., 1965, 'Calibrating the Electrical Potential Method for Studying Slow Crack Growth,' Material Research and Standard, Vol. 5, No. 9, pp. 442-445
  7. Saxena, A., and Han, J., 1986, 'Evaluation of Crack Tip Parameters for Characterizing Crack Growth Behavior in Creeping Material,' ASTM, Task Group Report, Joint Task Group E24.08.0/E24.04.08
  8. Shih C. F., 1983, Tables of Hutchinson-Rice-Rosengren Singular Field Quantities, Brown University