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@ARTICLE{Gietl:878802,
      author       = {Gietl, H. and Olbrich, S. and Risch, J. and Holzner, G. and
                      Hoeschen, T. and Coenen, Jan Willem and Neu, R.},
      title        = {{E}stimation of the fracture toughness of tungsten
                      fibre-reinforced tungsten composites},
      journal      = {Engineering fracture mechanics},
      volume       = {232},
      issn         = {0013-7944},
      address      = {Kidlington},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2020-03055},
      pages        = {107011},
      year         = {2020},
      abstract     = {Tungsten fibre-reinforced tungsten composites (Wf/W) have
                      been developed to overcome the inherent brittleness of
                      tungsten, which is a promising candidate for the
                      plasma-facing material in a future fusion power plant. As
                      the development of Wf/W evolves, the fracture toughness of
                      the composite is in the focus of interest for further
                      component design. In this contribution fracture mechanical
                      tests on two different types of chemical vapour deposited
                      (CVD) Wf/W are presented. Three-point bending tests
                      according to ASTM E399 as a standard method for brittle
                      materials were used to get a first estimation of the
                      toughness. A provisional fracture toughness value of up to
                      241 MPa was calculated for the as-fabricated and of up to
                      20.5 MPa for a heat-treated and thus embrittled state. As
                      the material does not show a brittle fracture in the
                      as-fabricated state, the J-Integral approach based on the
                      ASTM E1820 was additionally applied for this state. A
                      maximum value of the J-integral of 7.5 kJ/ (57.6 MPa ) was
                      determined. A detailed post mortem investigations was used
                      to obtain the active mechanisms.},
      cin          = {IEK-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000536482400005},
      doi          = {10.1016/j.engfracmech.2020.107011},
      url          = {https://juser.fz-juelich.de/record/878802},
}