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The issue of stress state during mechanical tests to assess cladding performance

The issue of stress state during mechanical tests to assess cladding performance

ID：40103951

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页数：18页

时间：2019-07-21

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1、JournalofNuclearMaterials412(2011)250–267ContentslistsavailableatScienceDirectJournalofNuclearMaterialsjournalhomepage:www.elsevier.com/locate/jnucmatTheissueofstressstateduringmechanicalteststoassesscladdingperformanceduringareactivity-initiatedaccident(RIA)a,⇑bbaaJ.Desquines,D.A.Koss,A.T.Motta

2、,B.Cazalis,M.PetitaIRSN,DPAM,13115Saint-Paul-lez-DuranceCedex,FrancebThePennsylvaniaStateUniversity,227ReberBuilding,UniversityPark,PA16802,USAarticleinfoabstractArticlehistory:ThemechanicaltestproceduresthataddressfuelcladdingfailureduringaRIAarereviewedwithanReceived27July2010emphasisonthedeve

3、lopmentoftestproceduresthatdeterminethedeformationandfracturebehaviorAccepted9March2011ofcladdingunderconditionssimilartothosereachedinaRIA.AnanalysisofcladdingstraindatafromAvailableonline7April2011experimentalresearchreactortestprogramsthathavesimulatedtheRIAispresented.Thesedatashowthatthecla

4、ddingundergoesdeformationcharacterizedbyhoopextensionsubjecttoarangeofmultiaxialstressstatesandstrainpathscomprisedbetweenplane-strain(noaxialextensionofthecladdingtube)andequal-biaxialtension(equalstraininboththehoopandtheaxialorientations).Currentmechanicaltestproceduresofcladdingmaterialareth

5、enreviewedwithafocusontheirabilitytogeneratetheappro-priatedeformationresponseandtoinducetheprototypicalmultiaxialstressstatesandfailuremodesactivatedduringaRIA.Twomaingroupsoftestscurrentlyexist.Inthefirstgroup,thedeformationbehaviorofthecladdingisexaminedbyseveralvariationsofhooptensiletestsinw

6、hichanaxialcontrac-tionofthespecimengagesectionoccurssuchthatanear-uniaxialtensionstressstateresults;finiteele-mentanalysesarethenusuallyemployedtodeducethedeformationresponse,oftenunderconditionsofanassumedcoefficientoffrictionbetweenthespecimenandtestfixtures.Thesecondgroupincludestestproceduresw

7、hichattempttoreproducethedeformationandfailureconditionsclosetothoseseenduringaRIAsuchthatanystress-statecorrectionsofthefailureconditionsarecomparativelysmall.Theadvan-tagesanddisadvantagesofallofthesedeformation/fracturete

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