Cyclic Nanoindentation for Local High Cycle Fatigue Investigations: A Methodological Approach Accounting for Thermal Drift |
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Authors: | Merle Schmahl Cecilia Müller Reinhard Meinke Erika G Alves Alcantara Ude D Hangen Claudia Fleck |
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Affiliation: | 1. Fachgebiet Werkstofftechnik/Chair of Materials Science & Engineering, Institute of Materials Science and Technology, Faculty III Process Sciences, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany;2. Bruker NanoSurfaces and Metrology, Bruker Nano GmbH, Dennewartstrasse 200, 52068 Aachen, Germany |
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Abstract: | Cyclic nanoindentation allows characterizing the influence of single phases and their interactions on fatigue mechanisms. Herein, a method for high cycle fatigue testing by nanoindentation is presented. By combining high- and low-frequency indentation modes, high cycle numbers are achieved while obtaining sufficient data points to reconstruct force–displacement hysteresis loops. A challenge is the stochastic course of thermal drift which is addressed by measuring drift rate in regular low-force holding segments. Drift rates are used to correct the displacement values, yielding reproducible cyclic deformation data as it is shown for two very different materials, a ductile metal and a brittle ceramic. |
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Keywords: | aluminum foam cyclic nanoindentation nanofatigue thermal drift correction zirconia |
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