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@ARTICLE{Okotete:1047158,
      author       = {Okotete, Eloho and Muslija, Alban and Hohmann, Judith K.
                      and Kohl, Manfred and Brinckmann, Steffen and Lee, Subin and
                      Kirchlechner, Christoph},
      title        = {{E}nhanced crack stability in micro scale fracture testing
                      via optimized bridge notches},
      journal      = {Materials science $\&$ engineering / A},
      volume       = {939},
      issn         = {0921-5093},
      address      = {Amsterdam},
      publisher    = {Elsevier},
      reportid     = {FZJ-2025-04115},
      pages        = {148479 -},
      year         = {2025},
      abstract     = {In micro cantilever fracture, a bridge notch geometry with
                      material ligaments at the notch ends helps to reduce focused
                      ion beam artefacts near the notch root by arresting initial
                      cracks and promoting fracture from sharp, natural cracks.
                      Thus, it significantly reduces the statistical scatter in
                      fracture toughness, a common but undesirable feature in
                      micro fracture testing. Although this concept has been
                      validated in simulations and experiments, systematic
                      investigations into the optimal geometry remain lacking. In
                      this study, we experimentally examine the influence of
                      bridge width and notch depth on the fracture toughness of
                      micro cantilevers, using single crystalline silicon as a
                      model material. We found that samples with thinner material
                      bridges and deeper notches exhibit crack arrest before
                      failure, while those with thicker bridges do not show crack
                      arrest instead exhibit apparent toughening. Cantilevers with
                      an optimized bridge notch geometry for crack arrest exhibit
                      a KIC of 1.09 ± 0.02 MPa m0.5, which agrees with previously
                      reported fracture toughness for the Si (111) surface.
                      Additionally, discrepancies between the bridge geometry in
                      the experiment and the ideal structure resulted in a
                      mismatch between the predicted and observed notch
                      requirements for crack arrest. Our findings offer practical
                      guidelines for designing bridge notch geometries to promote
                      bridge failure, thus improving statistical analysis in micro
                      fracture.},
      cin          = {IMD-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IMD-1-20101013},
      pnm          = {1241 - Gas turbines (POF4-124)},
      pid          = {G:(DE-HGF)POF4-1241},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1016/j.msea.2025.148479},
      url          = {https://juser.fz-juelich.de/record/1047158},
}