1519 フレッティング疲労き裂の進展方向と強度

概要

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In previous papers we presented estimation methods of fretting fatigue limits using fracture mechanics. In our previous analyses, the directions of the fretting cracks were assumed to be normal to the contact surface. But in the actual fretting fatigue cracks propagate inclined directions. This inclination is supposed to relate to the distribution of stress ranges. So in this paper the distributions of stress ranges are analyzed, and then the loci which pass maximum stress range points are plotted. These maximum stress range loci coincided well with the experimental results of fretting crack pass geometry. Finally the stress intensity factor range of these inclined cracks are analyzed and found that the stress intensity factor range of these inclined cracks are about 20% higher than that of normal cracks especially in small crack region less than 0.5mm. From these results we can confirm that the fretting fatigue strength can be estimated accurately by considering the inclination of the cracks.
社団法人日本機械学会の論文
2000-07-31