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@ARTICLE{Nordhorn:280687,
      author       = {Nordhorn, Christian and Mücke, Robert and Mack, Daniel E.
                      and Vassen, Robert},
      title        = {{P}robabilistic lifetime model for atmospherically plasma
                      sprayed thermal barrier coating systems},
      journal      = {Mechanics of materials},
      volume       = {93},
      issn         = {0167-6636},
      address      = {Amsterdam},
      publisher    = {Elsevier},
      reportid     = {FZJ-2016-00444},
      pages        = {199 - 208},
      year         = {2016},
      abstract     = {Calculations of atmospherically plasma sprayed thermal
                      barrier coating durability were facilitated by the
                      development of a numerical lifetime model including
                      probabilistic fracture mechanical analyses of thermally
                      induced topcoat stress field evolutions. The stress
                      distributions were determined in finite element analyses
                      taking into account oxide scale growth and topcoat sintering
                      as transient degradation effects. The influence of interface
                      microstructure was investigated by implementing two
                      different interface approximation functions. Subsequent
                      fracture mechanical analyses of subcritical crack growth
                      were performed at numerous different and permanently
                      assigned abstract crack positions. A comparison of the
                      transient energy release rate to its critical value, which
                      depends on crack length and therefore position, results in
                      statistical distributions of system lifetime as a function
                      of simulated thermal cycling conditions. The model was
                      calibrated by presetting an experimental lifetime
                      distribution which was determined in thermal cycling
                      experiments performed at a burner rig facility. The
                      associated cycle-dependent calibration parameter reflects
                      the effect of fracture toughness increase for increasing
                      crack lengths. Experimental reference values for system
                      lifetime were found to be reproduced by the lifetime model.
                      The stress field inversion directly correlated to oxide
                      scale growth rate was identified as the main failure
                      mechanism. The expectation values and standard deviations of
                      the calculated lifetime distributions were found to be in
                      accordance to the experimentally obtained lifetime data and
                      the data scattering typically observed in thermal cycling.},
      cin          = {IEK-1},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000368748900015},
      doi          = {10.1016/j.mechmat.2015.11.002},
      url          = {https://juser.fz-juelich.de/record/280687},
}