Title of article
AstudyontheevolutionofcracknetworksunderthermalfatigueloadingOriginalResearchArticle
Author/Authors
MasayukiKamaya، نويسنده , , SaïdTaheri، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2008
Pages
8
From page
2147
To page
2154
Abstract
Thecracknetworkisatypicalcrackingmorphologycausedbythermalfatigueloading.Itwaspointedoutthatthecracknetworkappearedunderrelativelysmalltemperaturefluctuationsanddidnotgrowdeeply.Inthisstudy,themechanismofevolutionofcracknetworkanditsinfluenceoncrackgrowthwasexaminedbynumericalcalculation.First,thestressfieldneartwointeractingcrackswasinvestigated.Itwasshownthattherearestress-concentrationandstress-shieldingzonesaroundinteractingcracks,andthatcrackscanformanetworkunderthebi-axialstresscondition.Secondly,aMonteCarlosimulationwasdevelopedinordertosimulatetheinitiationandgrowthofcracksunderthermalfatigueloadingandtheevolutionofthecracknetwork.Thelocalstressfieldformedbypre-existingcrackswasevaluatedbythebodyforcemethodanditsroleintheinitiationandgrowthofcrackswasconsidered.Thesimulationcouldsimulatetheevolutionofthecracknetworkandchangeinnumberofcracksobservedintheexperiments.Itwasrevealedthatreductioninthestressintensityfactorduetostressfeatureinthedepthdirectionunderhighcyclethermalfatigueloadingplaysanimportantroleintheevolutionofthecracknetworkandthatmechanicalinteractionbetweencracksinthenetworkaffectsinitiationratherthangrowthofcracks.Thecracknetworkappearsonlywhenthecrackgrowthinthedepthdirectionisinterrupted.Itwasconcludedthattheemergenceofthecracknetworkispreferableforthestructuralintegrityofcrackedcomponents.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2008
Journal title
Nuclear Engineering and Design Eslah
Record number
895169
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