DOI QR코드

DOI QR Code

핵연료 봉의 마찰변태구조 관찰과 프레팅 마멸 특성

Observation of Tribologically Transformed Structures and fretting Wear Characteristics of Nuclear Fuel Cladding

  • 김경호 (한국원자력연구소 원전재료동적손상평가) ;
  • 이민구 (한국원자력연구소 원전재료동적손상평가) ;
  • 이창규 (한국원자력연구소 원전재료동적손상평가) ;
  • 위명용 (충북대학교 공과대학 재료공학과) ;
  • 김흥회 (한국원자력연구소 원전재료동적손상평가)
  • 발행 : 2002.12.01

초록

In this research, fretting tests were conducted in air to investigate the wear characteristics of fuel cladding materials with the fretting parameters such as normal load, slip amplitude, frequency and the number of cycles. A high frequency fretting wear tester was designed for this experiment by KAERI. After the experiments, the wear volume and the shape of wear contour were measured by the surface roughness tester. Tribologically transformed structures(TTS) were analysed by means of optical and scanning electron microscopes to identify the main wear mechanisms. The results of this study showed that the wear volume were increased with increasing slip amplitude, and the shape of wear contour was transformed V-type to W-type. Also, it was found that the critical slip amplitude was 168${\mu}{\textrm}{m}$. These phenomena mean that wear mechanism transformed partial slip to gross slip to accelerate wear volume. The wear depth increased with an increase of friction coefficient due to increase of normal load and frequency. The fretting wear mechanisms were believed that, after adhesion and surface plastic deformation occurred by relative sliding motion on the contact between two specimens, TTS creation was induced by surface strain hardening and wear debris were detached from the contact surface which were produced by the micro crack propagation and creation.

키워드

참고문헌

  1. Lee, S. K. and Kim, K. T., 1993, 'Confirmation of Failure Causes of the KORI-2 Cycles 7&8 KOFA Fuel and Remedies against the Fuel Failure,' KAERI/TR-387
  2. Han, J. H., Choi, M. S., Lee, D. H., Hur, D. H. and Song, M. H., 2001, 'Accurate Diagnosis on Structural Relation between Wear-Damaged Steam Generator Tube and Anti-Vibration Structures (AVS),' The Eighth Workshop on Integrity of Mechanical Component in Nuclear Power Plant, KINS/AR-560, Vol. 4, pp. 603-619
  3. Waterhouse, R.B., 1972, Fretting Corrosion, Pergamon Press, Oxford
  4. Kim, Hyung-Kyu 1998, Proceeding of Annual Fall Conferences of the KSME(Chung Cheong), pp. 169-174
  5. Olof Vingsbo, 1996, 'Evaluation of Fretting Damage of Zircaloy Cladding Tubes,' Journal of Tribology, Vol. 118, pp. 705-710 https://doi.org/10.1115/1.2831598
  6. Guerout, F. M. and Fisher, N. J., 1999, 'Steam Generator Fretting Wear Damage : A Summary of Recent Findings,' Journal of Pressure Vessel Technology, Vol. 121, pp. 304-310 https://doi.org/10.1115/1.2883707
  7. Attia, M. H. and Magel, E., 1999, 'Experimental Investigation of Long-Term Fretting Wear of Multi-Span Steam Generator Tubes with U-bend Sections,' Wear, Vol. 225-299, pp. 563-574 https://doi.org/10.1016/S0043-1648(98)00382-2
  8. Kim, Hyung-Kyu, 1999, 'Mechanical Analysis of Fuel Fretting Problem,' Nuclear Engineering and Design, Vol. 192, pp. 81-93 https://doi.org/10.1016/S0029-5493(99)00092-8
  9. Siegfried Fouvry, Philippe Kapsa and Leo Vincent, 1996, 'Quantification of Fretting Damage,' Wear, Vol. 200, pp. 186-205 https://doi.org/10.1016/S0043-1648(96)07306-1
  10. Kim, Hyung-Kyu, Kang, Heung-Seok, Yoon, Kyung-Ho and Song, Kee-Nam, 2001, 'Contact Condition of Zircaloy-4 Tube and Support and Transition of Slip Regime,' Proc. The Thirty-Third Annual Spring Conferences of The Korean Society of Tribologists & Lubrication Engineers, pp. 81-88
  11. Kim, Hyung-Kyu, Song, Kee-Nam, Kang, Heung-Seok and Yoon, Kyung-Ho, 2000, 'Test and Evaluation of Fuel Rod Fretting Wear,' KAERI/TR-1702
  12. Cho, K.H., Kim, T.H. and Kim, S.S., 1998, 'Fretting Wear Characteristics of Zircaloy-4 Tube,' Wear, Vol. 219, pp. 3-7 https://doi.org/10.1016/S0043-1648(98)00164-1
  13. Uhlig H. H., 1953, ASTM, Spec. Tech. Pub., No. 144, p.77
  14. Berthier, Y., 1988, 'Fretting Wear Mechanisms and Their Effects on Fretting Fatigue,' ASME Journal of Tribology, Vol. 110, pp. 517-524 https://doi.org/10.1115/1.3261663
  15. Fouvy S. 1977, Etude Quantitative des Degradations en Fretting, Ph. D. Thesis, 97-04, Ecole Centre de Lyon, France