Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on the Measurement of the Crack Length Using the DCPD Method for the Fracture Test of the Pipe Specimen

직류전위차법을 이용한 배관 균열 길이 측정에 관한 연구

  • 박재실 (성균관대학교 기계공학부) ;
  • 석창성 (성균관대학교 기계공학부)
  • Published : 2004.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

In order to perform elastic-plastic fracture mechanical analyses, fracture resistance curves for concerned materials are required. The unloading compliance method and the DCPD(Direct Current Potential Drop) method have been widely used for measuring the crack length and the extension for a standard specimen fracture resistance curve test. However it is difficult to apply the unloading compliance method to a real pipe fracture resistance curve test. The objective of this paper is to propose the calibration equation between the normalized crack length and the normalized electric potential, and to apply to pipe fracture experiments. For these, finite element analyses were performed with various current input locations and crack front configurations. Also the 4-point bending jig was manufactured for a pipe test and the DCPD method was used to measure crack extensions and crack lengths for a pipe test. The calculated crack length by the DCPD method agreed with the measured crack length within 5% error.

Keywords

References

  1. 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
  2. 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
  3. 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 KINS Workshop on the Integrity of Piping, pp. 41-52
  4. Seok, C. S. and Kang, B. G., 1999, 'Evaluation of Fracture Resistance Characteristics of SA508 CI.1a Carbon Steel For Piping System,' Transactions of the KSME A, Vol. 23, No. 7, pp. 1147-1154
  5. Park, J. S. and Seok, C. S., 2001, 'A Study on the Characteristic of Fracture Toughness in the Multi-Pass Welding Zone for Nuclear Piping,' Transactions of the KSME A, Vol. 25, No. 3, pp. 381-389
  6. ASTM International, 2001, 'Standard Test Method for Measurement of Fracture Toughness,' E1820-01
  7. Rudland, D. L., Scott, P. M. and Wilkowski, G. M., 1996, 'The Effect of Cyclic and Dynamic Loads on Carbon Steel Pipe,' NUREG/CR-6438
  8. Wilkowski, G. M., Ahmad, J., Barnes, C. R., Broek, D., Kramer, G., Landow, M., Marschall, C. W., Maxey, W., Nakagaki, M., Scott, P., Papaspyropoulos, V., Pasupathi, V. and Popelar, C., 1984, 'Degraded Piping Program Phase-II,' NUREG/CR-4082, Vol. 1-Vol. 8
  9. Wilkowski, G. M., Ahmad, J., Brust, F., Ghadiali, N., Krishnaswamy, P., Landow, M., Marschall, C. W., Scott, P. and Vieth, P., 1994, 'Short Cracks in Piping and Piping Welds,' NUREG/CR-4599, Vol. 1-Vol. 4
  10. Scott, P., Wilson, M., Olson, R., Marschall, C., Schmidt, R. and Wilkowski, G. M., 1991, 'International Piping Integrity Research Group Program - Final Report,' NUREG/CR-6233, Vol. 1-Vol. 4
  11. Hopper, A., Wilkowski, G. M., Scott, P., Olson, R., Rudland, D., Kilinski, T., Mohan, R., Ghadiali, N. and Paul, D., 1996, 'The Secondary International Piping Integrity Research Group Program - Final Report,' NUREG/CR-6452
  12. Stadtmuller, W. and Sturm, D., 1997, 'Leak-Before-Break Behavior of Austenitic and Ferritic Pipes Containing Circumferential Defects,' Nuclear Engineering & Design, Vol. 174, Issue 3, pp. 335-342 https://doi.org/10.1016/S0029-5493(97)00130-1
  13. J. Chattopadhyay, B. K. Dutta and H. S. Kushwaha, 2000, 'Experimental and Analytical Study of Three Point Bend Specimen and Throughwall Circumferentially Cracked Straight Pipe,' International Journal of Pressure Vessels and Piping, Vol. 77, Issue 8, pp. 455-471 https://doi.org/10.1016/S0308-0161(00)00052-1