K-1003 Ti-6Al-4V合金のフレッティング疲労損傷特性(J04-1 フレッティング摩耗と疲労(1))(J04 フレッティング摩耗と疲労)

概要

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Fretting fatigue characteristic of Ti-6Al-4V in the high cycle regime, was investigated. The fretting fatigue limits of Ti-6Al-4V at 10^7cycles were σa=130MPa for stress ratio R=-1, 100MPa for R=0.5 and 80MPa for R=0.7 and those at 10^8cycles were σa=130MPa, 90MPa and 70MPa, respectively. It is found that the Goodman's relation can be applicable for the present material and under the present test conditions. From the SEM observations it is found that a fretting fatigue crack initiates in the very late stage of fatigue life. From the test results, even in the high cycle regime the specimens may be fracture at the stress level lower than fatigue strength defined at 10^7cycles. The effect of frequency was also investigated. Between 30Hz and 300Hz, the frictional force on fretting contact were clearly different. It may affects fretting fatigue damage and fretting fatigue behavior.
社団法人日本機械学会の論文
2001-08-22