Crack Propagation Behavior in Fretting Fatigue of S45C Carbon Steel

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概要

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• 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 σ_a 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 ΔK_<eff>, 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 σ_a.

• 一般社団法人日本機械学会の論文

著者

• Fujii Hajime

  Faculty Of Engineering Chiba University

• SATO Kenkichi

  Faculty of Engineering, Chiba University

• KODAMA Shotaro

  Faculty of Technology, Tokyo Metropolitan Univ.

• Sato Kenkichi

  Faculty Of Engineering Chiba University

• Kodama Shotaro

  Faculty Of Technology Tokyo Metropolitan University

• Kodama Shotaro

  Faculty Of Technology Tokyo Metropolitan Univ.

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