Evaluating Schmid criterion for predicting preferential locations of persistent slip markings obtained after very high cycle fatigue for polycrystalline pure copper
Article dans une revue avec comité de lecture
Date
2015Journal
International Journal of FatigueRésumé
Very high cycle fatigue carried out on pure copper polycrystals promotes early slip markings, labelled as slip markings of types II and III, localized close to grain or twin boundaries. In this work, we focus on whether Schmid criterion can predict the preferential sites of slip markings of types II and III and identify the active slip systems. Combining observations of slip markings and polycrystalline modeling, it is shown that considering pure cubic elastic behavior, maximum resolved shear stress as a criterion for type II slip markings preferential sites is 70% reliable criterion. Concerning slip markings of type III, the reliability falls to 30%. The role of cross slip is highlighted and a scenario rationalizing the stress amplitude conditions and sites to observe early slip markings of type II or III for copper polycrystals is proposed.
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Communication avec actePHUNG, Ngoc-Lam; MARTI, Nicolas; BLANCHE, Antoine; RANC, Nicolas; FAVIER, Véronique; CHRYSOCHOOS, André; SAINTIER, Nicolas; GREGORI, Fabienne; BACROIX, Brigitte; THOQUENNE, Guillaume (Elsevier, 2013)The DISFAT project is a French project financially supported by the French National Agency for Research (ANR). It aims at a deeper understanding of mechanisms leading to crack initiation in metals and alloys under Very ...
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Article dans une revue avec comité de lecturePHUNG, Ngoc-Lam; VALES, Fréderic; MURGHRABI, Haël; RANC, Nicolas; FAVIER, Véronique (Elsevier, 2014)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 ...
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