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Zr-2.5Nb 압력관의 휘어진 CT시편으로 측정한 J 저항곡선의 정확도에 관한 연구
A Study on Accuracy of J-Resistance Curves Measured with Curved Compact Tension Specimen of Zr-2.5Nb Pressure Tube

윤기봉   (중앙대학교 기계공학부UU0001197  ); 박태규   (중앙대학교 대학원UU0001197  ); 김영석   (한국원자력연구소CC0186830  );
  • 초록

    Methodology based on the elastic-plastic fracture mechanics has been widely accepted in predicting the critical crack length(CCL) of pressure tubes of CANDU nuclear plants. A conservative estimate of CCL is obtained by employing the J-resistance curves measured with the specimens satisfying plane strain condition as suggested in the ASTM standard. Due to limited thickness of the pressure tubes the curved compact tension(CT) specimens taken out from tile pressure tube have been used in obtaining J-resistance curves. The curved CT specimen inevitably introduce slant fatigue crack during precracking. Hence, effect of specimen geometry and slant crack on J-resistance curve should be explored. In this study, the difference of J integral values between the standard CT specimens satisfying plane strain condition and the nonstandard curved CT with limited thickness (4.2mm) is estimated using finite element analysis. The fracture resistance curves of Zr-2.5Nb obtained previously by other authors are critically discussed. Various finite element analysis were conducted such as 2D analysis under plane stress and plane strain conditions and 3D analysis for flat CT, curved CT with straight crack and curved CT with slant crack front. J-integral values were determined by local contour integration near the crack tip, which was considered as accurate J-values. J value was also determined from the load versus load line displacement curve and the J estimation equation in the ASTM standard. Discrepancies between the two values were shown and suggestion was made for obtaining accurate J values from the load line displacement curves obtained by the curved CT specimens.


  • 주제어

    휘어진 CT 시편 .   J적분 .   임계 균열 길이 .   압력관 .   유한요소해석.  

  • 참고문헌 (18)

    1. Davies, P. H., Aitchison, I., Himbeault, D. D., Jarvine, A. K. and Watters, J. F., 1995, 'On the Fracture of Cold-Worked Zr-2.5Nb Pressure Tubes Fabricated from 100% Recycled Material,' Fatigue Frac.e of Engng Mater. Struct., Vol 18, No 7/8, pp. 789-800 
    2. Chow, C. K. and Simpson, L. A., 1988, 'Determination of the Fracture Toughness of Irradiated Reactor Pressure Tubes Using Curved Compact Specimens,' Fracture Mechanics : 18th Symposium, ASTM STP 945, pp. 419-439 
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    4. Davies, P. H., Hosbons, R. P., Griffiths, M. and Chow, C. K., 1994, 'Correlation between Irradiated and Unirradiated Fracture Toughness of Zr-2.5Nb Pressure Tubes,' Zirconium in the Nuclear Industry : 10th International Symposium, ASTM STP 1245, pp. 135-167 
    5. Chow, C. K., Coleman, C. E., Hosbons, R. R., Davies, P. H., Griffiths, M. and Choubey, R., 1991, 'Fracture Toughness of Irradiated Zr-2.5Nb Pressure Tubes from CANDU Reactors,' Zirconium in the Nuclear Industry : 9th International Symposium, ASTM STP 1132, pp. 246-275 
    6. Leitch, B. W., 1999, 'Fracture Analyses of an Internally Pressurized Tube Containing an Axial, Through-Wall Crack,' Fatigue and Fracture Mechanics : 29th Volume, ASTM STP 1332, pp. 830-850 
    7. Davies, P. H., 1999, 'Predicting Crack Instability Behavior of Burst Tests from Small Specimens for Irradiated Zr-2.5Nb Pressure Tubes,' ASTM STP 1321, pp. 535-561 
    8. Davies, P. H. and Shewfelt, R. S. W., 1996, 'Link Between Results of Small- and Large-Scale Toughness Tests on Irradiated Zr-2.5Nb Pressure Tube Material,' ASTM STP 1295, pp. 492-517 
    9. Hibbit, Karlsson & Sorensen., 1998, ABAQUS Theory and User's Manual Version 5.8 Hibbit, Karlsson & Sorensen, Inc., Province, Rhode Island 
    10. ASTM Standard E 1820-99a, 1999, 'Standard Test Method for Measurement of Fracture Toughness' 
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    12. Davies, P. H. and Shewfelt, R. S. W., 2000, 'Size, Geometry and Material Effects in Fracture Toughness Testing of Irradiated Zr-2.5Nb Pressure Tube Material,' ASTM STP 1354, pp. 356-376 
    13. Oh, D. J., Ahn, S. B. and Kim, Y. S., 2001, 'Validation of CCT Fracture Toughness Test with Non-uniformed Pre-Fatigue Crack,' J. Kor. Inst. Met. & Mater, Vol. 39, No. 1, pp. 27-33 
    14. Davies, P. H. and Stearns, C. P., 1985, 'Axial Fracture Toughness Testing of Zr-2.5Nb Pressure Tube Material,' ASTM STP 868, pp. 308-327 
    15. Ahn, S. B., Kim, J. K. and Kim, Y. S., 2001, 'The Strength and Fracture Behavior Characteristics of Irradiated Zr-2.5Zb CANDU Pressure Tube Materials,' Transactions of the KSME, A, Vol. 25, No. 3, pp. 510-519 
    16. Davies, P. H., 1997, 'Predicting Crack Instability Behaviour of Burst Tests from Small Specimens for Irradiated Zr-2.5Nb Pressure Tubes,' ASTM STP 1321, pp. 535-561 
    17. Kim, Y. S., 1997, 'Development of the Advanced Neclear Power Materials-Zirconum Alloy (Pressure Tube Materials),' KAERI Report, KAERI/RR-1766/96 
    18. Cheadle, B. A., Coleman, C. E. and Licht, H., 1982, 'CANDU-PHW Pressure Tubes: Their Manufacture, Inspection and Properties,' Nuclear Technology, Vol. 57, pp. 413-425 
  • 이 논문을 인용한 문헌 (1)

    1. Shin, In Hwan ; Park, Chi Yong ; Seok, Chang Sung ; Koo, Jae Mean 2014. "Evaluation of Shape Parameter Effect on the J-R Curve of Curved CT Specimen Using Limit Load Method" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. A. A, 38(7): 757~764     

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