Evaluating Schmid criterion for predicting preferential locations of persistent slip markings obtained after very high cycle fatigue for polycrystalline pure copper |
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| Affiliation: | 1. Stiftung Institut für Werkstofftechnik (IWT), Bremen, Germany;2. CONICET and University of Buenos Aires, Argentina;1. Institute of Mechanics, Otto von Guericke University Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany;2. Department of Mechanical Engineering, Politecnico di Milano, via La Masa 1, 20156 Milan, Italy;1. Departamento de Ingeniería Mecánica y Minera, Universidad de Jaén, Campus Linares, 23700 Linares, Jaén, Spain;2. Departamento de Ingeniería Civil: Construcción, E.T.S de Ingenieros de Caminos, Canales y Puertos, Universidad Politécnica de Madrid, C/ Profesor Aranguren, s/n, 28040 Madrid, Spain;3. Departamento Ciencia de Materiales, E.T.S de Ingenieros de Caminos, Canales y Puertos, Universidad Politécnica de Madrid, C/ Profesor Aranguren, s/n, 28040 Madrid, Spain;1. Department of Civil and Environmental Engineering, Yonsei University, 50 Yonsei-ro, Seodamun-gu, Seoul 120-749, Republic of Korea;2. Department of Mechanical Engineering, UNIST, 50 UNIST-gil, Ulsan 689-798, Republic of Korea |
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| Abstract: | 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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| Keywords: | Persistent slip bands Grain boundaries Finite element simulations Elastic anisotropy Crossslip |
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