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- W169781256 abstract "An apparatus was designed to study the fretting wear of contact between a ball bearing and bearing steel flat (hardness 715VHN) over a range of slip amplitudes from 5μm to 50μm. The normal load was varied between 135 and 437N and the frequency was 50Hz. It was possible to subject the flat to a static tensile stress, and this was raised in steps up to 600MPa. The steel flat itself had a surface residual compressive stress of 800MPa, so the applied stress caused a reduction in magnitude and depth of influence of the residual stress. Two types of wear scar were produced in the test. Where there was partial slip (T<μP) an annular ring of damage was formed, the outer radius of which was constant, but the inner radius gradually decreased with increasing number of cycles. The second type of scar was produced when full slip occurred over the contact region (T≥μm). The scar in this case was a full circle and its diameter increased with number of fretting cycles. When a tensile stress was applied cracks were generated in both types of fretting area. In the full slip regime these propagated to failure. The shortest time to failure was associated with a critical amplitude of 35μn which corresponded to a peak in the coefficient of friction of 0.72. Raising the temperature to 200°C led to the development of a “glaze oxide” on the surfaces with a much reduced coefficient of friction. No cracks were generated in this case. The presence of a residual compressive stress in the surface appears to have very little influence on the initiation of cracks by fretting. The development of fretting wear damage is discussed in relation to the mechanisms of fretting wear both when T<μP and when T≥μP." @default.
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- W169781256 date "1989-01-01" @default.
- W169781256 modified "2023-09-27" @default.
- W169781256 title "The effect of residual stress and temperature on the fretting of bearing steel" @default.
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- W169781256 doi "https://doi.org/10.1016/s0167-8922(08)70200-1" @default.
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