Prediction of Slip Displacement in Nuclear Fuel Fretting Wear

Hyung Kyu Kim; Ju Sun Song; Young Ho Lee; Youn Ho Jung; Jae Hoon Kim

doi:10.4028/www.scientific.net/KEM.297-300.1365

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 297-300Prediction of Slip Displacement in Nuclear Fuel...

Prediction of Slip Displacement in Nuclear Fuel Fretting Wear

Abstract:

Slipping characteristic on the contacts between the tubes and the supports is investigated to study the fretting wear of a vibratory tube. Tests were carried out to simulate the vibration of the fuel rods supported by the springs and dimples. A tube was forced to vibrate with 30Hz. The supporting condition was varied artificially: positive contact force or gap existence. During the tube vibration, amplitudes were measured continuously in the vicinity of the supports. Simple equations were derived to evaluate the slip displacement on the contacts. As a result, it was found that the supporting condition affected the vibration characteristic near the contacts. In the positive contact condition, the phase difference of the vibration signals at both sides of the contact was 180 degrees. It is altered in the gap condition and the higher frequency components than 30Hz appeared. The severer wear in the case of the gap existence is discussed with the evaluated slip distance per cycle.

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Periodical:

Key Engineering Materials (Volumes 297-300)

Pages:

1365-1370

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.297-300.1365

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Online since:

November 2005

Authors:

Hyung Kyu Kim, Ju Sun Song, Young Ho Lee, Youn Ho Jung, Jae Hoon Kim

Keywords:

Fretting Wear, Nuclear Fluel, Slip Displacement, Supporting Condition, Vibration Behaviour

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References

[1] H.K. Kim and Y.H. Lee: Wear Vol. 255 (2003), p.1183.

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[5] P. A Engel: Impact Wear of Materials (Elsevier Scientific Publishing Co., The Netherlands 1978) Table 2 Evaluated slip ranges (at center oscillation range 0. 7mm) Axial slip (µm) Transverse slip (mm) Location of contact 5N Gap 0. 2mm 5N Gap 0. 2mm Spring (S) 0. 28 9. 49 0. 06 6. 11 Left dimple (DL) 0. 77 10. 0 0. 15 6. 76 Right dimple (DR) 0. 17 8. 92 0. 05 5. 51.

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