1986 Volume 52 Issue 474 Pages 417-424
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 σa 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 ΔKeff, 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 σa.
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A
Transactions of the Japan Society of Mechanical Engineers Series C
Transactions of the Japan Society of Mechanical Engineers Series B
