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@PHDTHESIS{ZABEEN:96256,
      author       = {ZABEEN, SURAIYA and DESY},
      title        = {{F}atigue {C}rack {G}rowth in {C}omplex {R}esidual {S}tress
                      {F}ields {D}ue to {S}urface {T}reatment and {F}oreign
                      {O}bject {D}amage under {S}imulated {F}light {C}ycles},
      school       = {The University of Manchester},
      type         = {Dissertation},
      address      = {Manchester},
      publisher    = {The University of Manchester},
      reportid     = {PHPPUBDB-21609},
      pages        = {230},
      year         = {2011},
      note         = {Dissertation, The University of Manchester, 2011},
      abstract     = {Foreign object damage (FOD) refers to the damage that
                      generally takes place in aero engine fans and compressor
                      blades, due to the ingestion of hard particles/debris during
                      aeroplane take-off, taxiing, or landing. Such damage can
                      reduce the fatigue life expectancy of the turbine engine
                      components by $50\%.$ Residual stresses and small
                      microcracks induced by the high speed FOD impacts are two
                      root causes that result in premature failure of these
                      components. One way to mitigate the FOD related fatigue
                      failure is to induce deep compressive residualstress into
                      the surface. Among the available techniques that can induce
                      such compressive residual stress, laser shock peening (LSP)
                      has been found to be beneficial in improving the fatigue
                      strength. In this study aerofoil-shaped Ti-6Al-4V leading
                      edge specimens were laser shock peened. Subsequently, FOD
                      was introduced onto the leading edge specimenthrough
                      ballistic impacts of a cube edge at angles of 0° and 45°
                      to the leading edge. The effect of foreign object damage
                      (FOD) on the pre-existing compressive residual stress field
                      associated with the laser shock peening (LSP), and its
                      change upon solely low cycle fatigue (LCF) as well as
                      combined low and high cycle fatigue cycling has been
                      studied. The residual stress distribution and their
                      redistribution upon fatigue cycling were mapped around the
                      FOD notch, using synchrotron X-ray radiation and the contour
                      method. The results suggest that under both impact angles,
                      the FOD event superimposed a significant additional residual
                      stress on top of the pre-existing stress associated with the
                      LSP process. It has been observed that the FOD notch created
                      by 45° impact was asymmetric in shape, and had differential
                      notch depth between the entry and exit side. However, FOD
                      damage that is created at 0° impact appeared as a sharp V
                      notch. A higher amount of residual stresses were produced
                      under 0° impact condition than at 45°. It has been found
                      even though the FOD inducedresidual stresses relax, residual
                      stresses due to LSP treatment remain highly stable even in
                      the worst condition where a 7 mm long crack was grown from a
                      45° notch. The plastic zone sizes ahead of a crack tip was
                      estimated for both 0° and 45° FOD impact, and the fatigue
                      crack growth rates are predicted utilizing the measured
                      residual stress distribution.},
      keywords     = {Dissertation},
      cin          = {HASYLAB(-2012) / HZG},
      cid          = {$I:(DE-H253)HASYLAB_-2012_-20130307$ /
                      I:(DE-H253)HZG-20120731},
      pnm          = {PETRA Beamline P07 (POF2-54G14) / DORIS Beamline W2
                      (POF2-54G13)},
      pid          = {G:(DE-H253)POF2-P07-20130405 / G:(DE-H253)POF2-W2-20130405},
      experiment   = {EXP:(DE-H253)D-W2-20150101 / EXP:(DE-H253)P-P07-20150101},
      typ          = {PUB:(DE-HGF)11},
      url          = {https://bib-pubdb1.desy.de/record/96256},
}