Is There a Threshold for PSB Formation in Iron
Thin flat specimens (1mm thickness) have been tested on a piezoelectric fatigue machine in 20 KHz frequency on High cycle fatigue domain and beyond.The result shows that body centered cubic Armco iron (with 80ppm of carbon content) could fail after 109 cycles at a loading well below the yield stress.Observations under Scanning Electron Microscope on the specimen surface and the fracture surface indicated gigacycle fatigue failure originated in the specimen surface and related to the formation of Persistent Slip Bands (PSB).The microstructure evolution was observed by optical microscopy.It was found that PSB not only appear at the beginning of ultrasonic fatigue test but also increase with the number of cyclic loading.
Persistent Slip Band irreversible deformation localized plasticity very high cycle fatigue
Chong Wang Danièle Wagner Claude Bathias
LEME,University Paris Ouest Nanterre La Défense 50,rue de Sèvres,92410 VILLE D’AVRAY,France
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）