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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

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 Kraft, O.

Volltext §
DOI: 10.5445/IR/1000120178
Veröffentlicht am 25.06.2020
Seitenaufrufe: 260
seit 25.06.2020
Downloads: 445
seit 25.06.2020
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