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@PHDTHESIS{Motaman:811655,
author = {Motaman, Seyedamirhossein},
othercontributors = {Bleck, Wolfgang and Raabe, Dierk and Prahl, Ulrich},
title = {{M}odeling of the microstructural effects on the mechanical
response of polycrystals},
school = {Rheinisch-Westfälische Technische Hochschule Aachen},
type = {Dissertation},
address = {Aachen},
publisher = {RWTH Aachen University},
reportid = {RWTH-2021-01324},
pages = {1 Online-Ressource : Illustrationen, Diagramme},
year = {2021},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University; Dissertation, Rheinisch-Westfälische Technische
Hochschule Aachen, 2021, Kumulative Dissertation},
abstract = {The modeling and hence exploitation of the connection
between the microstructure and the mechanical response of
polycrystals is and continues to be at the forefront of the
longstanding challenges in the materials science and
metallurgical engineering. The macroscopic mechanical
response of polycrystalline materials is intricately
governed by the propensity of the micro-mechanisms of
crystal plasticity, which are controlled by the
instantaneous hierarchical microstructure and its evolution.
Therefore, the microstructure almost exclusively controls
the macroscopically observable mechanical response of
polycrystalline aggregates in terms of the stress response
and its variation (the stress rate or strain hardening). In
this thesis, the microstructural effects on the mechanical
response/properties of polycrystals are classified into four
groups: the polarity, size, composite, and porosity effects.
The historical background as well as the research on the
modeling of the microstructural effects, which has so far
lasted almost a century, are concisely reviewed. The primary
microstructural effects, the size and polarity effects, are
modeled for different polycrystalline metallic materials at
various length scales. First, the size effect was modeled at
the macro-scale using a nonlocal (physics-based)
microstructural model for polycrystal plasticity to simulate
the behavior of a ferritic-pearlitic steel during large
deformation in the cold and warm regimes. Then, the model
was applied to simulate industrial cold and warm forging
processes of a bevel gear shaft and predict its final
microstructure and properties
(process-microstructure-properties linkage). Second, the
polarity effect was modeled at the mesoscale using a
physics-based crystal plasticity model to simulate the
(macroscopic) anisotropic mechanical response of an
additively manufactured austenitic high-Mn steel
(microstructure-properties linkage). It was, then,
demonstrated that the mesoscale model can be applied for the
optimal computational design of an additively manufactured
lattice structure.},
cin = {522110 / 520000},
ddc = {620},
cid = {$I:(DE-82)522110_20140620$ / $I:(DE-82)520000_20140620$},
typ = {PUB:(DE-HGF)11},
doi = {10.18154/RWTH-2021-01324},
url = {https://publications.rwth-aachen.de/record/811655},
}
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