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Deformation Behavior of Tungsten Single Crystals During Wedge Nanoindentation - a Numerical Study

Volz, Tillmann

Abstract (englisch):
The present work aims at the numerical investigations on the plastic deformation behavior of tungsten single crystals on the microscale, based on finite-element (FE) wedge nanoindentation simulations. These numerical studies on plasticity of body-centered cubic materials in the range of nanometers to few micrometers require not only an incorporation of a crystal plasticity model to describe slip dominated plastic deformation in the FE-simulations but moreover, the consideration of geometrically necessary dislocations (GND) and non-Schmid effects. Thus, an existing crystal plasticity model was extended to determine gradients of plastic shear and non-Schmid effects for the implementation of enhanced FE-simulations of wedge nanoindentation. A comprehensive evaluation of the influence of GNDs and non-Schmid effects on the plastic deformation response of the single crystal was performed under plane strain conditions. Dependent on the applied model, a significant difference in the stress state, the plastic shear on active slip systems and material pile-up around the indenter was observed. In contrast, solely slight deviations in the density of GNDs and crystal lattice rotation under the residual imprint were found. ... mehr

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Volltext §
DOI: 10.5445/IR/1000120178
Veröffentlicht am 25.06.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Werkstoff- und Biomechanik (IAM-WBM)
Publikationstyp Hochschulschrift
Publikationsdatum 25.06.2020
Sprache Englisch
Identifikator KITopen-ID: 1000120178
Verlag Karlsruher Institut für Technologie (KIT)
Umfang XII, 153 S.
Art der Arbeit Dissertation
Fakultät Fakultät für Maschinenbau (MACH)
Institut Institut für Angewandte Materialien - Werkstoff- und Biomechanik (IAM-WBM)
Prüfungsdatum 19.05.2020
Referent/Betreuer Prof. O. Kraft
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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