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Very high cycle fatigue of copper: Evolution, morphology and locations of surface slip markings

Article dans une revue avec comité de lecture
Author
PHUNG, Ngoc-Lam
VALES, Fréderic
MURGHRABI, Haël
ccRANC, Nicolas
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
ccFAVIER, Véronique

URI
http://hdl.handle.net/10985/8062
DOI
10.1016/j.ijfatigue.2014.01.007
Date
2014
Journal
International Journal of Fatigue

Abstract

The surfaces of commercially pure polycrystalline copper specimens subjected to interrupted 20 kHz fatigue tests in the very high cycle fatigue regime were investigated. The stress amplitude needed to form the early slip markings was found twice lower than the stress amplitude required to fracture which confirmed the results obtained by Stanzl-Tschegg et al. (2007). Three types of slip markings were classified according to their morphology and their location in the polycrystalline material. They are compared to slip markings observed during fatigue tests at frequencies lower than 100 Hz and numbers of cycles lower than 107. For 20 kHz fatigue tests, stress amplitudes ranging from 45 MPa to 65 MPa produce straight and long early persistent slip markings located along twin boundaries. Stress amplitudes lower than 45 MPa produce clusters of fine early persistent slip markings mainly located at triple junctions.

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