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@PHDTHESIS{Pinto:1046645,
      author       = {Pinto, Ralstom},
      title        = {{A} constitutive theory to represent non-idealities in
                      contacting of {SOC} interconnect contacts},
      volume       = {673},
      school       = {RWTH Aachen University},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2025-03877},
      isbn         = {978-3-95806-846-9},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {xii, 139},
      year         = {2025},
      note         = {Dissertation, RWTH Aachen University, 2025},
      abstract     = {The electrical contact resistance at solid oxide cell (SOC)
                      contacts is a key aspect which contributes to ohmic losses
                      in an SOC stack. These resistances are primarily dependent
                      on the mechanical contact pressures applied in the active
                      area, which are influenced by non-idealities caused by
                      manufacturing limitations. Finite element methods (FEM) can
                      be used to study these phenomena, but conventional
                      simulation approaches are often impractical due to excessive
                      computation times. Such excessive computational times are
                      caused by complex designs of repeating components and high
                      mesh resolutions required for accurate modeling. To address
                      these challenges, this work investigates the use of
                      computational homogenization techniques in the SOC stack.
                      These methods characterize the periodically repeating
                      structure of interconnect contacts as an equivalent material
                      response, capturing the required effects while significantly
                      reducing computation time. The non-idealities arising from
                      manufacturing tolerances are incorporated using a
                      constitutive material model demonstrating an
                      offset-formulation, while the soft porous coating on the
                      contacts is represented through a coating-formulation.
                      Furthermore, the model shows temperaturedependent and
                      rate-dependent behavior, making it capable of simulating the
                      various loading stages in the lifecycle of an SOC contact.
                      On developing a simplified modeling approach for the
                      aforementioned challenges, a framework is developed to
                      extrapolate key parameters relevant to SOC performance
                      directly from this simplified model. This motivates the use
                      of the simplified model as a replacement of full-field
                      modeling approaches. The developed modeling framework is
                      validated through experimental case studies, which focus on
                      evaluating the mechanical contact pressure after stacking
                      and also the electrical contact resistance during operation.
                      The findings from this work have important implications for
                      optimizing several process parameters to achieve an ideal
                      contact configuration in the active area of an SOC stack.
                      These parameters may include stacking force, tolerance
                      limits, temperature distribution, material properties and
                      the geometric design of contacts, which can be evaluated
                      efficiently using the proposed computational approach.},
      cin          = {IMD-2},
      cid          = {I:(DE-Juel1)IMD-2-20101013},
      pnm          = {1231 - Electrochemistry for Hydrogen (POF4-123)},
      pid          = {G:(DE-HGF)POF4-1231},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      doi          = {10.34734/FZJ-2025-03877},
      url          = {https://juser.fz-juelich.de/record/1046645},
}