In order to analyze the elastic-plastic fracture behavior of a structure, the fracture resistance curve of the material should be known first. The standard CT specimen was used to obtain the fracture resistance curves of a piping system. However, it is known that the fracture resistance curve by the standard CT specimen is very conservative to evaluate the integrity of a structure. Also the fracture resistance curve is effected by the specimen geometry and the dimensions because of the constraint effect. The objective of this paper is to be certain the conservativeness of the fracture resistance curve by the standard CT specimen and to provide an additional safety margin. For these, the fracture tests using a real pipe specimen and the standard CT specimen test were performed. A 4-point bending jig was manufactured for the pipe test and the direct current potential drop method was used to measure the crack extension and the length for the pipe test. Also finite element analyses were performed with a CT specimen and a pipe in order to prove the additional safety margin. From the result of tests and analyses of the pipe and the standard CT specimen, it was observed that the fracture analysis with the standard CT specimen is conservative and the additional safety margin was proved.
U. S. NRC Piping Review Commission, 1983, 'Evaluation of Potential for Pipe Break,' Report of the U. S. Nuclear Regulatory Commission Piping Review Committee, NUREG-1061, Vol. 3.
Fabi, R. J. and Peck, D. A., 1994, 'Leak Before Break Piping Evaluation Diagram', ASME Conference, PVP-Vol. 283, pp. 111-115
Yu, Y. J., Park, S. H., Sohn, G. H., Kim, Y. J. and Urko, W., 1995, 'Application of LBB to a Nozzle-Pipe Interface', LBB 95, Lyon-France
Joyce, J. A., Hackett, E. M. and Roe, C., 1993, 'Effects of Crack Depth and Mode of Loading on the J-R Curve Behavior of a High-Strength Steel',' Constraint Effects in Fracture, ASTM STP 1171, pp. 239-263
Hong, J. H., Lee, B. S. and Oh, J. M., 1993, 'Fracture Resistance (J-R) Characteristics of the Primary Piping Materials for Yonggwang 3/4 Nuclear Power Plants,' Proceedings of 1st KlNS Workshop on the Integrity of Piping, pp. 41-52
Seok, C. S. and Kang, B. G., 1999, 'Evaluation of Fracture Resistance Characteristics of SA508 Cl.la a Carbon Steel for Piping System,' Transactions of the KSME A, Vol. 23, No.7, pp. 1147-1154
Wilkowski, G. M., et al., 1996, 'The Secondary International Piping Integrity Research Group Program Final Report',' NUREG/CR-6452
Park, J. S. and Seok, C. S., 2004, A Study on the Measurement of the Crack Length Using the DCPD Method for the Fracture Test of the Pipe Specimen', Transactions of the KSME A, Vol. 28, No.5, pp. 640-647
ASTM International, 2001, 'Standard Test Method for Measurement of Fracture Toughness,' Annual Book of ASTM, E1820-01
Shih, C. F., O'Dowd, N. P. and Kirk, M. T., 1993, 'A Framework for Quantifying Crack Tip Constraint,' Constraint Effects in Fracture, ASTM STP 1171, pp. 2-20
Hibbitt Karlsson and Sorensen Inc., 1999, ABAQUS version 5.8 User's manual
이 논문을 인용한 문헌 (2)
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
2015. "" International journal of precision engineering and manufacturing, 16(1): 65~71