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1.
IntroductionAsamaterialundergoesirreversiblebehavior,itsmicrostructurewillchange .Particularly ,thesinglecrystalvolumefractionofapolycrystal,whichismathematicallyascalarfunctionontherotationgroupandiscalledaCODF (crystalorientationdistributionfunction) ,c…  相似文献   

2.
Thethreshold_crossingofstochasticprocessesisaproblemoftenencounteredinthestudyofvariousphysicalphenomena .Theterm ,threshold_crossing ,isusedtoindicateacertainfixedvaluebeingcrossedbytheoscillatingrealizationζ(1) (t)ofastochasticprocessζ(t) ,asshownbythetypi…  相似文献   

3.
IntroductionAsexperimentalresearchshows[1]:Meanwhilebladepositivecurvingreducesthecrosswisepressuregradientintipclearance,resultinginthedecreaseoftherelativeleakagethroughtipclearance ,themixinglossgeneratedfromtheinteractionofthetipleakageandthecrosswi…  相似文献   

4.
IntroductionForgeomaterialssuchasrockandconcrete,thefrictionalslidingalongmicrocracksurfacesisassociatedwiththeplasticitymodeldescribedbytheMohr_Coulombtheory ;moreovercrackpropagationcorrespondstodamagegrowth .Thecouplingofdamageandplasticityofaphenom…  相似文献   

5.
Self-Similar Solutions of Fracture Dynamics Problems on Axially Symmetry   总被引:4,自引:0,他引:4  
IntroductionCompositematerialsarealmostmadeupoffiberandmatrixwithanisotropicmacrostructure ,whosevariousstructuresareeasytoappearapenny_shapedmicrocrackintheprocessoftheirwork.Whenitextendsgradually ,thestructurewillleadtodestruction .Itiswell_knownthat…  相似文献   

6.
IntroductionThebasicfunctionofthemicrocirculationistoallowrapidexchangeofwater,gases,nutrientsandwasteproductsbetweenthebloodandtissuecells.Amicrocirculationunitthereforeconsistsofmicrovessels(arterioles,capillaries,venules,thoroughfaresandarteriole_…  相似文献   

7.
IntroductionAsageneralizationoftheclasicalfieldtheory,nonlocalfieldtheorycanbeusedasthetheoreticalbaseinmacro_micromechanicsb...  相似文献   

8.
3-D Fracture Propagation Simulation and Production Prediction in Coalbed   总被引:2,自引:0,他引:2  
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   

9.
IntroductionInthestrengthofmaterials[1],inordertoeliminatetheadditionaltorsioninathin_walledcylinderwithopencross_sectionunderbendingbyatransverseforce,itissufficienttoremovethetransverseforceatthebendingcenter.Thereforeanapproximatemethodtocalculatethe…  相似文献   

10.
IntroductionWhenastaticallyindeterminatetrusshasalowerloadcapacityowingtothetremendousdifferenceofinternalforcesofbars,itdoesn’tlayingoodworkingstate.Toincreasethecapacity ,cross_sectionalareasofelementsareoptimizedbytheprogrammingmethodandthecriterion…  相似文献   

11.
IntroductionThecomprehensivemathematicalmodeldevelopedinthefirstpartofthispaper[1]containsdozensofcoupledequationsthatformalargenonlinearequationsystem.Herewecombineanalyticalandnumericalmethodstosolveitanddiscussandanalyzesomeimportantproblemsinmicroc…  相似文献   

12.
IntroductionThecylindricalparticlesuspensionsinvolvesomedifficultproblemsinthetheoreticalresearchofmultiphaseflowandnon_Newtonianflow ,andhavewideapplicationintheindustrialengineering .Forexample,duringtheprocessingofsomematerials,primitivematerialprope…  相似文献   

13.
IntroductionOfallthefiber_reinforcedcompositematerials,theshort_fibercompositematerialnotonlystrengthensthematrixbutavoidsdefectionsofthelong_fibercompositematerialaswell.Themicro_mechanicsaboutitsuchasfracture ,fatigueanddamageisverycomplex .Intheprevi…  相似文献   

14.
IntroductionInourpreceedingpaper[1 ]thefundamentallaws,balanceequationsandC_Dinequalitiesincontinuawithoutmicrostructurearesystematicallyrestudied ,andthenewconservationlawsandtherelatedC_Dinequalitiesareestablished .Inthispapersomeremarksontheresultsinc…  相似文献   

15.
IntroductionOneoftheprimaryproblemsingoetechnicalengineeringistoconstructasoilconstitutivemodelapplicabletogeneral 3_Dstressstates.Althoughmanytypesofconstitutivemodelshavebeenproposed ,fewcantakeproperaccountofthedirectionalchangeofstressvector (i.e .,ro…  相似文献   

16.
COMPUTATION OF SUPERSONIC TURBULENT FLOWFIELD WITH TRANSVERSE INJECTION   总被引:1,自引:0,他引:1  
IntroductionThemixingflowfieldresultingfromasonicgaseousinjectioninjectedtransverselyintoasupersonicfreestreamisencounteredinmanyfieldssuchasrocketmotorthrustvectorcontrolsystems,supersoniccombustion ,high_speedflightvehiclereactioncontroljets,andgas_t…  相似文献   

17.
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   

19.
IntroductionFatiguefractrueisaprimarymodeoffailureformetallicstructuresandmechanicalsystemssubjectedtovariousdynamicloads.Atthebeginningofservice,someinherentdefectssuchasmicrocracks,weldingdefects,notches,voidsetc.existinmanystructuresorelements.Thesed…  相似文献   

20.
微/纳系统国际会议2002 (International Con-ference on Micro and Nano Systems(ICMNS2002))将于2002年8月11~14日在云南昆明召开.本届会议由中国力学学会(CSTAM)、非线性力学国家重点实验  相似文献   

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