简介：Poweristhenucleusofsocialandpoliticallife.Effectiverestraintonandsupervisionovertheoperationofpoweristhefundamentalwayofpreventingcorruptionofpower,whichatthesametimeconstitutesanimportantindica-

简介：<正>BeijingurgedBrusselstoshowrestraintamidreportsthattheEuro-peanUnionispoisedtoprobeChinesetelecomcompaniesinEurope,according

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简介：Therestraintintensity(RI)ofthepipelinegirthweldingjointwasinvestigatedusingfiniteelementmethodandexperimentalmethodtopredictthecoldcrackingsusceptibilityofpipelinesteel.ThedistributionofRIalongthegirthweldwasinvestigatedtostudytheinfluenceofweldingpositionontheRI.Subsequently,theeffectsofouterdiameter(OD)andwallthicknessofpipelineontheRIwerestudiedwithABAQUSsoftware.TheresultsshowthattheRIisalmostindependentofweldingposition.TheRIincreasedwiththeincreasingwallthicknessbutdecreasedwiththeincreasingOD.ApredictionmodelofRIwasdevelopedbasedontheeffectsoftheODandthewallthickness.IthasbeenfoundthatthepredictedRIswereingoodagreementwiththeexperimentalvalues.ThemaximumfractionalerrorbetweenthepredictedRIandtheexperimentalvalueswasjustabout10%.Itwasindicatedthattheerrorsweremainlycausedbytheheterogeneousoftheweldbead.

简介：Theout-of-planedeformationisaseriousprobleminthin-plateweldedjoint,anditisdifficulttoreduceorcontrolthedistortionduringweldingprocess.Externalrestraintisregardedasaneffectivemethodtomitigatethedistortion,anditiswidelyusedintheactualmanufacturingprocess.Inordertoinvestigatetheinfluenceofexternalrestraintonweldingdeformationinthinplatejoints,athermo-elastic-plasticfiniteelementmethodbasedonABAQUSsoftwarewasdevelopedtocalculatewelding-induceddeformation.Meanwhile,weldingdeformationinthethin-platejointswasmeasuredbyexperiments.Throughcomparingthenumericalresultswiththemeasureddata,theeffectivenessofthedevelopedcomputationalapproachwasverified.Basedonthesimulatedandexperimentalresults,thegenerationmechanismoftheout-of-planedeformationinthinplatebead-onjointwasdiscussed,andtheinfluenceofexternalrestraintonthefinalweldingdeformationwasclarified.