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@ARTICLE{Khaliq:640322,
      author       = {Khaliq, Ahmar and Wittwer, Felix and Wildeis, Anna and
                      Hartmann, Markus and Thimm, Matthias and Brandt, Robert and
                      Brueckner, Dennis Bjoern and Garrevoet, Jan and Falkenberg,
                      Gerald and Modregger, Peter},
      title        = {{M}ulti-modal strain mapping of steel crack tips with
                      micrometre spatial resolution},
      journal      = {Journal of synchrotron radiation},
      volume       = {32},
      number       = {6},
      issn         = {0909-0495},
      address      = {Chester},
      publisher    = {IUCr},
      reportid     = {PUBDB-2025-04773},
      pages        = {1503 - 1510},
      year         = {2025},
      abstract     = {Due to their superior fatigue strength, martensitic steels
                      are the material of choice for high cyclic loading
                      applications such as coil springs. However, crack
                      propagation is influenced by residual stresses and their
                      interaction is poorly understood. In fact, linear elastic
                      fracture mechanics predicts unphysical singularities in the
                      strain around the crack tip. In this study, we have combined
                      synchrotron-based X-ray diffraction, X-ray fluorescence and
                      optical microscopy to map the factual strain fields around
                      crack tips with micrometre spatial resolution. X-ray
                      fluorescence and optical images were co-registered to locate
                      the crack in the X-ray diffraction maps. Observed crystal
                      recovery close to cracks confirmed that the diffraction
                      signal originates at least in part from the cracks. The
                      retrieved local strain field around the crack was further
                      improved by averaging information over carefully selected
                      diffraction peaks. This procedure provided strain maps
                      around crack tips with a spatial resolution of about 1 μm
                      and may enable heuristic predictions of further crack
                      growth.},
      cin          = {DOOR ; HAS-User / FS-PETRA},
      ddc          = {550},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      I:(DE-H253)FS-PETRA-20140814},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      FS-Proposal: I-20220505 (I-20220505) / 05K22PS2 - Schnelle
                      Röntgennanodiffraktion (BMBF-05K22PS2)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3 /
                      G:(DE-H253)I-20220505 / G:(DE-Ds200)BMBF-05K22PS2},
      experiment   = {EXP:(DE-H253)P-P06-20150101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1107/S1600577525008100},
      url          = {https://bib-pubdb1.desy.de/record/640322},
}