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@ARTICLE{Heuer:863881,
      author       = {Heuer, Simon},
      collaboration = {Weber, Thomas and Pintsuk, Gerald and Coenen, Jan Willem
                      and Matejicek, J. and Linsmeier, Christian},
      title        = {{A}iming at understanding thermo-mechanical loads in the
                      first wall of {DEMO}: {S}tress–strain evolution in a
                      {E}urofer-tungsten test component featuring a functionally
                      graded interlayer},
      journal      = {Fusion engineering and design},
      volume       = {135},
      issn         = {0920-3796},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2019-03852},
      pages        = {141 - 153},
      year         = {2018},
      abstract     = {For the future fusion demonstration power plant, DEMO,
                      several blanket designs are currently under
                      consideration.Despite geometric and operational differences,
                      all designs suggest a first wall (FW), in which tungsten(W)
                      armour is joined to a structure made of Reduced Activation
                      Ferritic Martensitic (RAFM) steel. In
                      thermomechanicalanalyses of breeding blankets, this joint
                      has received limited attention. In order to provide a basis
                      forbetter understanding of thermally induced stresses and
                      strains in the FW, the thermo-mechanical behaviour of
                      awater-cooled test component is explored in the current
                      contribution. The model aims at providing a simplegeometry
                      that allows straightforward comparison of numerical and
                      experimental results, while trying to keepboundary
                      conditions as realistic as possible. A test component with
                      direct RAFM steel-W joint, and a testcomponent with a
                      stress-redistributing, functionally graded RAFM steel/W
                      interlayer in the joint is considered inthe current
                      contribution. The analyses take production- and
                      operation-related loads into account. Following adetailed
                      analysis of the evolution of stress components and strain in
                      the model, a parameter study with respect togeometric
                      specifications and loads is presented.The analyses show
                      that, even in a small test component, a direct RAFM steel-W
                      joint causes enormous plasticdeformation. The implementation
                      of a functionally graded interlayer reduces stresses and
                      strains significantly,but vertical normal stresses at the
                      joint's circumference remain considerable. With the
                      component geometryconsidered here, the graded interlayer
                      should be at least 1mm thick and contain 4 sublayers to
                      appropriatelyredistribute stresses. Beyond a component width
                      of 14 mm, stresses increase strongly, which may pose a risk
                      tothe applicability of large-scale FW components, too.},
      cin          = {IEK-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {6213 - Materials and Processes for Energy and Transport
                      Technologies (POF3-621) / EUROfusion - Implementation of
                      activities described in the Roadmap to Fusion during Horizon
                      2020 through a Joint programme of the members of the
                      EUROfusion consortium (633053)},
      pid          = {G:(DE-HGF)POF3-6213 / G:(EU-Grant)633053},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000447082300019},
      doi          = {10.1016/j.fusengdes.2018.07.011},
      url          = {https://juser.fz-juelich.de/record/863881},
}