摘要
Inthispaper,theeffectofplasticconstraintontheinitiationofductiletearsinfourdifferentshipbuildingstructuralsteelshasbeenexperimentallystudiedbymeasuringtheJ-integralandcrackopeningdisplacementCODatinitiationinthree-pointbendspecimenswithdeepandshallownotches.ExperimentalresultsofsevengroupsofdifferentstrengthalloysteelsshowthatbothδìandJìvaluesofductiletearfromtheshallowcrackspecimenswhichhavelessconstraintflowfieldaresignificantlyhigherthanthoseofdeeplynotchedspecimens.Slip-line-fieldanalysisshowsthat,forshallowcrack,thehydrostaticstressislowerthanthatfromstandarddeeplycrackedbendspecimen,whichdevelopsahighlevelofcracktipconstraint,providesalowerboundestimateoftoughness,andwillensureanundulyconservativeapproachwhenappliedtostructuraldefects,especiallyifinitiationvaluesofCODandJ-integralareused.
出版日期
2003年02月12日(中国期刊网平台首次上网日期,不代表论文的发表时间)