Title of article
FormulationofanewintergranularcreepdamagemodelforausteniticstainlesssteelsOriginalResearchArticle
Author/Authors
B.Michel، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2004
Pages
14
From page
161
To page
174
Abstract
Theaimofthisstudyistoproposeaphysicallybasedintergranularcreepdamagemodelfornumericalsimulationsonextrapolatedsituations.Acontinuumdamageformulationisproposedtoevaluatenucleation,growthandcoalescenceofintergranularcreepcavities.Nucleationisbasedonanempiricallawwherevoidfractiongrowthrateisproportionaltothecreepstrainrate.Voidgrowthrateincludesthecontributionof:viscoplasticstrainrateofsurroundinggrains(Gurson),andvacancydiffusionalonggrainboundaries(HullandRimmer).Voidcoalescenceisbasedonamechanicalfracturecriterion,wherethecompetitionbetweendamagesofteningandviscoplastichardeningisconsidered.Theidentificationprocedureneedsonlytheresultsofuniaxialcreeptensiletestswitharangeoftimetorupturethatenablesasufficientdiffusioncontribution.Theconstrainteffectistakenintoaccountintheformulationofthemodelanddoesnotneedaspecificidentification.Toillustratethecapacityoftheproposedmodel,applicationsarepresentedforanausteniticstainlesssteeltestedat600°C.Itappearsthattheconstrainteffectassessmentisingoodagreementwithexperimentalresults,whenwecomparetimetoruptureandintergranulardamagelocalisationonnotchedspecimens,orcrackinitiationtimeandcrackgrowthrateonfatiguepre-crackedspecimens.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2004
Journal title
Nuclear Engineering and Design Eslah
Record number
894649
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