フレッティング疲労強度に及ぼすパッドの接近効果

概要

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The fretting fatigue strength of NiCrMoV generator rotor steel was examined under a contact pressure of 200 MPa, a relative slip amplitude of 5 to 6 μm and a stress ratio of 0.05. The fretting fatigue limit tested by a conventional method was 40 MPa ; however, the limit reduced to less than 10 MPa by decreasing the gap (C) between the edges of two contact pads to 0.25 mm. It was found that the fretting fatigue strengths are drastically reduced by decreasing the gap between the edges of the two contact pads. The fatigue cracks initiated under conditions where C=0.25 mm and the stress amplitudes was less than 20 MPa were arrested from 1.5 to 2.3 mm in depth. The crack growth properties and the non-propagating phenomema of the cracks in the fretting fatigue were successfully explained by fracture mechanics concepts.
社団法人日本機械学会の論文
1986-12-25