共查询到20条相似文献,搜索用时 343 毫秒
1.
IntroductionAsamaterialundergoesirreversiblebehavior,itsmicrostructurewillchange .Particularly ,thesinglecrystalvolumefractionofapolycrystal,whichismathematicallyascalarfunctionontherotationgroupandiscalledaCODF (crystalorientationdistributionfunction) ,c… 相似文献
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Thethreshold_crossingofstochasticprocessesisaproblemoftenencounteredinthestudyofvariousphysicalphenomena .Theterm ,threshold_crossing ,isusedtoindicateacertainfixedvaluebeingcrossedbytheoscillatingrealizationζ(1) (t)ofastochasticprocessζ(t) ,asshownbythetypi… 相似文献
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IntroductionAsexperimentalresearchshows[1]:Meanwhilebladepositivecurvingreducesthecrosswisepressuregradientintipclearance,resultinginthedecreaseoftherelativeleakagethroughtipclearance ,themixinglossgeneratedfromtheinteractionofthetipleakageandthecrosswi… 相似文献
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IntroductionForgeomaterialssuchasrockandconcrete,thefrictionalslidingalongmicrocracksurfacesisassociatedwiththeplasticitymodeldescribedbytheMohr_Coulombtheory ;moreovercrackpropagationcorrespondstodamagegrowth .Thecouplingofdamageandplasticityofaphenom… 相似文献
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IntroductionCompositematerialsarealmostmadeupoffiberandmatrixwithanisotropicmacrostructure ,whosevariousstructuresareeasytoappearapenny_shapedmicrocrackintheprocessoftheirwork.Whenitextendsgradually ,thestructurewillleadtodestruction .Itiswell_knownthat… 相似文献
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IntroductionThebasicfunctionofthemicrocirculationistoallowrapidexchangeofwater,gases,nutrientsandwasteproductsbetweenthebloodandtissuecells.Amicrocirculationunitthereforeconsistsofmicrovessels(arterioles,capillaries,venules,thoroughfaresandarteriole_… 相似文献
7.
黄再兴 《应用数学和力学(英文版)》1999,(7)
IntroductionAsageneralizationoftheclasicalfieldtheory,nonlocalfieldtheorycanbeusedasthetheoreticalbaseinmacro_micromechanicsb... 相似文献
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NomenclatureA(x,t)—Cross_sectionareaoffractureattimetandsitex,m2 ;Bg,Bw —Coalbedgasandwatervolumefactor,di mensionless;b—Langmuirfactor,(MPa) - 1 ;Cg,CR,Cw —Coalbedgas,rockandwatercom pressibilitycoefficient,(MPa) - 1 ;Cp —Sandratio ,dimensionless;Ct(x ,t)—Totalfracturin… 相似文献
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IntroductionInthestrengthofmaterials[1],inordertoeliminatetheadditionaltorsioninathin_walledcylinderwithopencross_sectionunderbendingbyatransverseforce,itissufficienttoremovethetransverseforceatthebendingcenter.Thereforeanapproximatemethodtocalculatethe… 相似文献
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IntroductionWhenastaticallyindeterminatetrusshasalowerloadcapacityowingtothetremendousdifferenceofinternalforcesofbars,itdoesn’tlayingoodworkingstate.Toincreasethecapacity ,cross_sectionalareasofelementsareoptimizedbytheprogrammingmethodandthecriterion… 相似文献
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IntroductionThecomprehensivemathematicalmodeldevelopedinthefirstpartofthispaper[1]containsdozensofcoupledequationsthatformalargenonlinearequationsystem.Herewecombineanalyticalandnumericalmethodstosolveitanddiscussandanalyzesomeimportantproblemsinmicroc… 相似文献
12.
NUMERICAL SIMULATION OF ORIENTATION DISTRIBUTION FUNCTION OF CYLINDRICAL PARTICLE SUSPENSIONS 总被引:2,自引:0,他引:2
IntroductionThecylindricalparticlesuspensionsinvolvesomedifficultproblemsinthetheoreticalresearchofmultiphaseflowandnon_Newtonianflow ,andhavewideapplicationintheindustrialengineering .Forexample,duringtheprocessingofsomematerials,primitivematerialprope… 相似文献
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IntroductionOfallthefiber_reinforcedcompositematerials,theshort_fibercompositematerialnotonlystrengthensthematrixbutavoidsdefectionsofthelong_fibercompositematerialaswell.Themicro_mechanicsaboutitsuchasfracture ,fatigueanddamageisverycomplex .Intheprevi… 相似文献
14.
New Conservation Laws of Energy and C-D Inequalities in Continua with Microstructure 总被引:7,自引:7,他引:0
戴天民 《应用数学和力学(英文版)》2001,22(2):135-143
IntroductionInourpreceedingpaper[1 ]thefundamentallaws,balanceequationsandC_Dinequalitiesincontinuawithoutmicrostructurearesystematicallyrestudied ,andthenewconservationlawsandtherelatedC_Dinequalitiesareestablished .Inthispapersomeremarksontheresultsinc… 相似文献
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IntroductionOneoftheprimaryproblemsingoetechnicalengineeringistoconstructasoilconstitutivemodelapplicabletogeneral 3_Dstressstates.Althoughmanytypesofconstitutivemodelshavebeenproposed ,fewcantakeproperaccountofthedirectionalchangeofstressvector (i.e .,ro… 相似文献
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IntroductionThemixingflowfieldresultingfromasonicgaseousinjectioninjectedtransverselyintoasupersonicfreestreamisencounteredinmanyfieldssuchasrocketmotorthrustvectorcontrolsystems,supersoniccombustion ,high_speedflightvehiclereactioncontroljets,andgas_t… 相似文献
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IntroductionHowtheintensionandmoduleofsteelfibrereinforcedconcrete (SFRC)dependsonitsconstituentpropertiesandcontentisaprincipalproblemtopredictmacro_mechanicspropertiesofSFRC,thekeyconsistsintheconfirmationofstressdistribution .Interfacialstresstransfe… 相似文献
18.
Althoughtheconstrainedtwistproblemsofthin_wallstraightbarsofisotropicand/oranisotropicmaterials,withclosedoropencross_sections,havebeenwellsolved[1~3],forspatialcurvedbarsofthistypeofproblemstherehasnotbeenanysatisfactorysolutionuptonow.Thisproblemis… 相似文献
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IntroductionFatiguefractrueisaprimarymodeoffailureformetallicstructuresandmechanicalsystemssubjectedtovariousdynamicloads.Atthebeginningofservice,someinherentdefectssuchasmicrocracks,weldingdefects,notches,voidsetc.existinmanystructuresorelements.Thesed… 相似文献