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http://dx.doi.org/10.3795/KSME-A.2005.29.8.1118

Evaluation of the Crack Initiation of Curved Compact Tension Specimens of a Zr-2.5Nb Pressure Tube Using the Unloading Compliance and Direct Current Potential Drop Methods  

Jeong, Hyeon-Cheol (한국원자력연구소)
Ahn, Sang-Bok (한국원자력연구소)
Kim, Young-Suk (한국원자력연구소)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.29, no.8, 2005 , pp. 1118-1122 More about this Journal
Abstract
The direct current potential drop (DCPD) method and the unloading compliance (UC) method with a crack opening displacement gauge were applied simultaneously to the Zr-2.5Nb curved compact tension (CCT) specimens to determine which of the two methods can precisely determine the crack initiation point and hence the crack length for evaluation of their fracture toughness. The DCPD method detected the crack initiation at a smaller load-line displacement compared to the UC method. As a verification, a direct observation of the fracture surfaces on the curved compact tension specimens was made on the CCT specimens experiencing either 0.8 to 1.0 mm load line displacement or various loads from $50\%\;to\;80\%$ of the maximum peak load, or $P_{max}$. The DCPD method is concluded to be more precise in determining the crack initiation and fracture toughness, J in Zr-2.5Nb CCT specimens than the UC method.
Keywords
PHWR; Pressure Tube; Curved Compact Tension Specimen; Fracture Toughness; Unloading Compliance Method; Direct Current Potential Drop Method;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Ahn, S.B., Kim, Y.S. and Kim, J.K., 2001, 'The Strength and Fracture Behavior Characterization of Irradiated Zr-2.5Nb CANDU Pressure Tube Materials,' KSME 25A, pp. 510-519   과학기술학회마을
2 Oh, S.J., Kim, I.S., Kim, Y.S. and Ahn, S.B., 2004, 'Evaluation of Fracture Toughness of CANDU Pressure Tubes using a Load Ratio Method,' Proceedings of Kor. Inst. Met. & Mater. 2004 Spring Meeting, p. 47
3 Kim, Y.S., Cheong, Y.M., Kwon, S.C., Kim, S.S. and Ahn, S.B., 1999, 'Procedures for Characterization Tests of Zr-2.5Nb Tubes,' KAERI Technical Report, KAERI/TR-1329/99
4 Sutton, G.E. and Vassilaros, M.G., 1986, 'Influence of Partical Unloadings Range on the J-R Curves of ASTM106 and 3-Ni Steels,' ASTM STP 905, pp. 364-378
5 Simpson, L.A., Chow, C.K. and Davies, P.H., 1989, 'Standard Test Method for Fracture Toughness of CANDU Pressure Tubes,' AECL Report COG-89-110-I
6 American Society for Testing and Materials, ASTM E 1820-01, 'Standard Test Method for Measurement of Fracture Toughness,'
7 Himbeault, D.D. and Davies, P.H., 1999, 'Second International Round Robin on Fracture Toughness Testing of Pressure Tube Materials Using 17 mm Curved Compact (Toughness) Specimens,' AECL, RC-2069, COG-98-161-I
8 American Society for Testing and Materials, ASTME 8, 'Standard Test Method of Tension Testing of Metallic Materials