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@PHDTHESIS{Gillner:751774,
      author       = {Gillner, Karl},
      othercontributors = {Bleck, Wolfgang Peter and Christ, Hans-Jürgen and
                          Münstermann, Sebastian},
      title        = {{E}rmittlung der {Z}eitfestigkeit und zyklischen
                      {R}issfortschrittsgeschwindigkeit eines {AFP}-{S}tahls aus
                      {M}ikrostruktursimulationen},
      volume       = {8/2018},
      school       = {RWTH Aachen University},
      type         = {Dissertation},
      address      = {Aachen},
      publisher    = {Shaker},
      reportid     = {RWTH-2018-231614},
      isbn         = {978-3-84406232-8},
      series       = {Berichte aus dem Institut für Eisenhüttenkunde},
      pages        = {1 Online-Ressource (xxi, 148 Seiten) : Illustrationen},
      year         = {2018},
      note         = {Druckausgabe: 2018. - Auch veröffentlicht auf dem
                      Publikationsserver der RWTH Aachen University 2019;
                      Dissertation, RWTH Aachen University, 2018},
      abstract     = {The experimental determination of fatigue material
                      properties is elaborate. A solution might be given by
                      numerical models. Here in this study, a multiscale numerical
                      approach is presented. The approach correlates the
                      statistical distribution of microstructural properties and
                      their microdeformation behavior with the material's
                      macroscopic fatigue behavior. The solution is used to
                      calculate the high cycle fatigue strength and the cyclic
                      crack propagation rate at different loading ratios. The
                      microstructural properties are modeled with statistically
                      equivalent representative volume elements (RVEs) of the
                      microstructure. Their generation requires statistical
                      distribution functions of the grain size and grain shape as
                      well as the phase fraction of the different phases. The
                      mechanical behavior is modeled for each phase separately. A
                      crystal plasticity (CP) constitutive material model with
                      combined isotropic and kinematic hardening is used to
                      calculate the mechanical response of each grain in
                      dependency of its crystallographic orientation. The crystal
                      plasticity parameter set is inversely calibrated on strain
                      controlled low cycle fatigue tests. The simulation of only
                      few loading cycles with the RVEs and the CP-model are
                      required to obtain local strain fields which can be
                      evaluated for the highest value of grain size averaged
                      accumulated plastic strain. The spot where the highest value
                      of this indicator occurs is evaluated to be the most likely
                      to initiate a lifetime determining fatigue crack. Simulating
                      a large number of these statistically equivalent, although,
                      in detail different RVEs, the indicators are distributed
                      after an extreme value distribution function. The indicator
                      and the parameters of the function are then used to
                      calculate the basis equation, which calculates the number of
                      cycles for crack initiation, and the extrapolation equation,
                      which extrapolates the basis equation to match experimental
                      findings of fatigue properties. In this thesis, the
                      ferritic-pearlitic steel 38MnSiV5 has been used for the
                      generation of the RVEs and the calibration of the CP-model.
                      The validation of the model's outcome has been conducted on
                      high cycle fatigue properties and cyclic crack propagation
                      rates at different loading ratios. The numerically obtained
                      results match the experiments in a very good agreement.},
      cin          = {522110 / 520000},
      ddc          = {620},
      cid          = {$I:(DE-82)522110_20140620$ / $I:(DE-82)520000_20140620$},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      doi          = {10.18154/RWTH-2018-231614},
      url          = {https://publications.rwth-aachen.de/record/751774},
}