常圧焼結窒化ケイ素の疲労機構, 繰返し効果の定量化とフレッティング摩耗モデル

概要

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A cyclic fatigue mechanism based upon cyclic degradation of the bridging effect due to cyclic load has been verified through extensive experimental results obtained by the authors. A fretting wear model for cyclic fatigue has been developed and compared with the experimental results. As the results, the model was proven to be excellent. Cyclic degradation of the bridging effect ΔK_s is found to be as follows: ΔK_s=1.54{(1-R)-0.08}log[10^<-4>/(da/dt)_<eq>]. R is stress ratio and (da/dt)_<eq> is equivalent crack propagation rate. This means that ΔK_s is proportional to the amplitude of cyclic load and to log N, where N is the number of stress cycles. This cyclic fatigue mechanism can successfully explain the main cyclic fatigue behaviour. Cycle-dependent crack propagation at low K_<Imax> results because the wear process is the rate controling process at bridging sites.
一般社団法人日本機械学会の論文
1992-11-25