Regensburg 2016 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 26: Poster session II

MM 26.43: Poster

Dienstag, 8. März 2016, 18:30–20:30, Poster B3

Local measurement of stress-strain-curves by spherical nanoindentation — •Patrick S. Feldner, Benoit Merle, and Mathias Göken — Materials Science and Engineering 1, Friedrich-Alexander-University Erlangen-Nürnberg (FAU)

In contrast to sharp indenters, spherical indenters offer the possibility to determine continuously the stress-strain response of a material at a very local scale. However due to the complex deformation field, various approaches are available for approximating the stress and strain during spherical nanoindentation experiments, leading to significantly different evaluations of the yield behavior of the material.

The aim of this work was to establish a reliable analysis procedure to turn nanoindentation raw data into meaningful stress-strain-curves. This procedure was further extended to the development of a new method for determining the strain-rate sensitivity of flow stress as a function of strain. In the case of ultrafine-grained metallic materials, it is shown that this information in combination with other micromechanical and structural characterization methods, could give new insights into the evolution of the different deformation mechanisms in dependence of the imposed strain.