简介:摘要本文详细介绍了在ABAQUS中,与Mohr-Coulomb屈服准则匹配的平面应变Drucker-Prager屈服准则及可转化为Drucker-Prager屈服准则表达式形式的其他屈服准则在ABAQUS中与Mohr-Coulomb屈服准则的参数转换关系。
简介:Anewviscoelastic-plastic(VEP)constitutivemodelforseaicedynamicswasdevelopedbasedoncontinuummechanics.Thismodelconsistsoffourcomponents:Kelvin-Vogitviscoelasticmodel,Mohr-Coulombyieldingcriterion,associatednormalityflowruleforplasticrehololgy,andhydrostaticpressure.Thenumericalsimulationsforicemotioninanidealizedrectangularbasinweremadeusingsmoothedparticlehydrodynamics(SPH)method,andcomparedwiththeanalyticalsolutionaswellasthosebasedonthemodifiedviscousplastic(VP)modelandstaticicejamtheory.ThesesimulationsshowthatthenewVEPmodelcansimulateicedynamicsaccurately.ThenewconstitutivemodelwasfurtherappliedtosimulateicedynamicsoftheBohaiSeaandcomparedwiththetraditionalVP,andmodifiedVPmodels.TheresultsoftheVEPmodelarecomparedbetterwiththesatelliteremoteimages,andthesimulatediceconditionsintheJZ20-2oilplatformareaweremorereasonable.
简介:Nanometer-scaleAuquantumdotshavebeenassembledonSiO2bycontrollingthereactionofrawmatedaistoformacitrateAusolandanaminosilane/dithiol-treatedpatternedSiwafer.Thedetailedformationmechanismhasbeenstudied.Threegoldcolloidalparticles(-15nm),alignedinachaintoformaone-dimensionalcurrentpath,wasbridgedacrossan80-nmgapbetweensourceanddrainmetalelectrodes,ThedeviceexhibitedaCoulombblockadeeffectat33K.
简介:Theoretical–computationalstudiesoftable-toplaser-drivennuclearfusionofhigh-energy(upto15MeV)deuteronswith7Li,6Li,andDnucleidemonstratetheattainmentofhighfusionyieldswithinasource–targetreactiondesign.ThisconstitutesasourceofCoulomb-explodingdeuteriumnanodropletsdrivenbyanultraintensefemtosecondnear-infraredlaserandasolidhollowcylindricaltargetcontainingthesecondelement.Thesource–targetreactiondesignattainsthehighesttable-topfusionefficiencies(upto4×109J1perlaserpulse)obtainedtodate.Thehighestconversionefficiencyoflaserenergytonuclearenergy(102–103)fortable-topDDfusionattainedinthesource–targetdesigniscomparabletothatforDTfusioncurrentlyaccomplishedfor‘bigscience’inertialfusionsetups.
简介:Inthiswork,aSignoriniproblemwithCoulombfrictionintwodimensionalelasticityisconsidered.Basedonanewrepresentationofthederivativeofthedouble-layerpotential,theoriginalproblemisreducedtoasystemofvariationalinequalitiesontheboundaryofthegivendomain.Theexistenceanduniqueessofthissystemareestablishedforasmallfrictionalcoefficient.Theboundaryelementapproximationofthissystemispresentedandanerrorestimateisgiven.