Abstract
The fretting wear characteristics of Zircaloy-4 tube used as the fuel rod cladding in nuclear power plants have been investigated experimentally. A fretting wear tester was designed for this experiment and cylinder-to-cylinder contact at right angles was used as the wear test method. This study was focused on the effects due to the combination of normal load, slip amplitude and number of cycles as the main factors of fretting. The results of the study showed that the wear volume increased abruptly at slip amplitudes above 100 μm. This was defined as the critical slip amplitude. It was found that the critical slip amplitude exists due to the partial slip regime in which materials deform elastically before surface damage occurs.
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