Title of article :
Investigationofhelix-shapedandtransversecrackpropagationinrotorshaftsbasedondiskshrunktechnologyOriginalResearchArticle
Author/Authors :
B.Andrier، نويسنده , , E.Garbay، نويسنده , , F.Hasnaoui، نويسنده , , P.Massin، نويسنده , , P.Verrier، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2006
Abstract :
Itisknownfrominternationalfeedbackthattherotorshaftsoftheturbo-generatorswithdiskshrunktechnologymayhavetransversecrackslocatednearthekeyswhichmaintainthebondbetweenthecoreoftheshaftandthesurroundingdisksincaseofoverspeed.Itwasunderstoodthatthecrackswereinitiatedbyfrettingbetweenthekeysandtheshaftandthattheypropagatedduetoafatiguemechanismgeneratedbytherotationalflexionoftheshaftsundergravity.Thedestructiveobservationnowcorrelatedtotheservicehistoryoftheshaftshowsdifferentmixedmodespropagationphasesandastoppedcircumferentialcrackevolutionduringthelastmonthsofserviceoftheshaft.Mechanicalstudiesbasedonthedeterminationofthestressintensityfactorsprovidetheevolutionofthestressintensityfactorsduringthecrackpropagation.Theygiveaccesstoinformationnotavailableotherwisetoexplaintheobservedcrackprofiles.Finally,experimentalinvestigationsareneededtoobtainthekineticsasafunctionofthestressintensityfactors.Theinformationprovidedishelpfulindeterminingthepossiblecrackprofilestobedetectedbythemostsuitablevibratorysurveillancesystemsbeforefailureinserviceoftheshaftline.
Journal title :
Nuclear Engineering and Design Eslah
Journal title :
Nuclear Engineering and Design Eslah
