鋼のピッチング疲労損傷に及ぼす表面あらさの影響

概要

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In order to investigate the influence of the surface roughness on the pitting failure, the fatigue tests have been tried under a repetitive rolling contace with sliding component by using two cylindrical test pieces made of the annealed S45C steel (by JIS). In these tests, several kinds of surface roughness have been prepared at the range of Rmax value between 25μm and 2.5μm by turnning, file- or sandpaper-grinding, or buffing. The transcription of surface roughness between pairing test pieces and the transition of Rmax values and roughness profiles of both test piece surfaces during the fatigue test running have been discussed in detail. As the result, it has been clarified that the effective roughness for the pitting failure arised only on the surfaces with lower rotational speed was that of the surfaces with higher rotational one, including the ranscribing roughness. Moreover, by using a and b as the surface roughness factor, the following equation has been introduced as to explain successfully the relationship between the increasing rate of pitting failure (Δd) and the repetitive rolling nmuber (N):Δd=aNb. In this equation, a and b are seemed to be related to the quantity and the quality of the surface roughness, respec tively.
長崎大学教育学部の論文
1990-03-00