期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 77, 期 -, 页码 115-127出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2015.03.009
关键词
Persistent slip bands; Grain boundaries; Finite element simulations; Elastic anisotropy; Crossslip
资金
- Agence Nationale de la Recherche France [ANR-09-BLAN-0025-01]
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. (C) 2015 Elsevier Ltd. All rights reserved.
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