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@PHDTHESIS{Dlz:809895,
      author       = {Dölz, Michael},
      othercontributors = {Münstermann, Sebastian and Zander, Brita Daniela and
                          Bleck, Wolfgang},
      title        = {{M}ikrostruktursensitive {M}odellierung der
                      wasserstoffinduzierten {R}issbildung von
                      {R}ohrleitungsstählen},
      school       = {Rheinisch-Westfälische Technische Hochschule Aachen},
      type         = {Dissertation},
      address      = {Aachen},
      reportid     = {RWTH-2021-00219},
      pages        = {1 Online-Ressource (XIV, 124 Seiten) : Illustrationen,
                      Diagramme},
      year         = {2020},
      note         = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University 2021; Dissertation, Rheinisch-Westfälische
                      Technische Hochschule Aachen, 2020},
      abstract     = {In the present work, the microstructural influence on
                      hydrogen-induced cracking is described using a
                      three-dimensional numerical modelling approach with the
                      commercial software ABAQUS FEA. The two-dimensional model
                      according to Oriani and Barrera, which previously has been
                      published in literature, was replicated, validated with an
                      analytical solution and extended to the three-dimensional
                      application. The resulting problem of meshing complex
                      geometries with hexahedral elements could be counteracted by
                      the use of tetrahedral elements. The mathematical deviation
                      between the local hydrogen concentration of the analytically
                      validated hexahedral elements and the tetrahedral elements
                      was solved by a developed linear element compensation
                      function. Furthermore, the HEDE and HELP mechanisms were
                      implemented in the form of a concentration-dependent stress
                      or strain-controlled damage criterion. On the basis of real
                      permeation tests, the newly developed three-dimensional
                      material model could successfully generate virtual
                      permeation measurements hence enable the derivation of the
                      effective diffusion coefficient of the investigated low
                      alloy pipeline steel. The investigations of
                      inclusion-affected representative submodels with different
                      fictional as well as real inclusion characteristics showed
                      that a strong correlation between the development of the
                      local hydrogen concentration and the existing inclusion
                      chemistry can be observed. Additionally, the influence of
                      size and shape of the inclusions could be shown. The model
                      for the description of the stress-dependent hydrogen
                      diffusion was applied to determine the critical non-metallic
                      inclusions. The comparison of different inclusion systems
                      showed that inclusions with the chemical composition Al2O3
                      in particular led to a significant increase in the local
                      hydrogen concentration. Thus, proving that especially these
                      inclusions contribute critically to the hydrogen-induced
                      crack initiation.},
      cin          = {522710 / 520000},
      ddc          = {620},
      cid          = {$I:(DE-82)522710_20140620$ / $I:(DE-82)520000_20140620$},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2021-00219},
      url          = {https://publications.rwth-aachen.de/record/809895},
}