炭素鋼 S 45 C のフレッティング疲労き裂進展挙動

概要

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The crack propagation behavior in fretting fatigue was investigated in carbon steel S45C. Fretting fatigue tests were carried out under cyclic direct stresses of 100 and 140 MPa, and a contact pressure of p=80 MPa for stress ratios of R=0.33, 0, -0.33, and -1. The crack closure phenomenon was monitored by the elastic unloading compliance method with a strain gage attached just beneath the surface crack front, and it was also observed on a TV monitor. The relationship between crack length a and crack propagation rate da/dN in fretting- and unfretting-fatigue was affected by stress amplitude σ_a and R. The crack closure phenomenon occurred markedly in fretting fatigue due to the compressive force by fretting pads. The effective stress intensity factor range ΔK_<eff>, calculated by using the measured crack opening rate U, can represent the crack propagation behavior in fretting fatigue relatively well without the effect of R or σ_a.
一般社団法人日本機械学会の論文
1986-02-25