Crack Propagation Behavior in Fretting Fatigue of S45C Carbon Steel

The crack propagation behavior in fretting fatigue was investigated with carbon steel S45C. Fretting fatigue tests were carried out under cyclic direct stresses of 100 and 140 MPa, and a contact pressure of p=80MPa for stress ratios of R=0.33, 0, -0.33 and -1. The crack closure phenomenon was monito...

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Bibliographic Details
Published in:Bulletin of JSME 1986, Vol.29(256), pp.3253-3258
Main Authors: SATO, Kenkichi, FUJII, Hajime, KODAMA, Shotaro
Format: Article
Language:English
Subjects:
Applied sciences
Carbon Steel
Condensed matter: structure, mechanical and thermal properties
Crack Closure
Crack Propagation
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fatigue
Fractures
Fretting Fatigue
Materials science
Mechanical and acoustical properties of condensed matter
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals, semimetals and alloys
Metals. Metallurgy
Other techniques and industries
Physics
Specific materials
Stress Intensity Factor
Stress Ratio
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Summary:The crack propagation behavior in fretting fatigue was investigated with carbon steel S45C. Fretting fatigue tests were carried out under cyclic direct stresses of 100 and 140 MPa, and a contact pressure of p=80MPa 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 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 owing to the compressive force by the fretting pads. The effective stress intensity factor range ΔKeff, calculated by using the measured crack opening ratio U, can represent the crack propagation behavior in fretting fatigue relatively well without the effect of R or σa.
ISSN:0021-3764
1881-1426
DOI:10.1299/jsme1958.29.3253