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1.
MICROMECHANICS ANALYSIS ON EVOLUTION OF CRACK IN VISCOELASTIC MATERIALS   总被引:1,自引:0,他引:1  
IntroductionAsshownbyZHANGandXIONG ( 1 997) [1],underconstantloadingthecrackinviscoelasticmaterialshasanincubationtime ,withinitthecrackopeningdisplacement (COD)ischanginglargerwithtime,whilethecracklengthkeepsconstant.Investigationonthegradualopeningofthecrac…  相似文献   

2.
IntroductionItisshownbyavailabletheoriesandexperiments[1]thaticosahedralsymmetryquasicrystalexistinginA1_Mnalloyis 3Dquasicrystal,ithasnotsymmetryinanydimensionsin 3Dspace ;Thesocalled 2Dquasicrystalsarethattheyhavetranslationalperiodicityinonespacedirecti…  相似文献   

3.
IntroductionForgeomaterialssuchasrockandconcrete,thefrictionalslidingalongmicrocracksurfacesisassociatedwiththeplasticitymodeldescribedbytheMohr_Coulombtheory ;moreovercrackpropagationcorrespondstodamagegrowth .Thecouplingofdamageandplasticityofaphenom…  相似文献   

4.
IntroductionDuetotheintrinsiccouplingcharacteristicsbetweenelectricandelasticbehaviors,thatis,appliedmechanicalloadingproduceselasticdeformation ,aswellaselectricfield ,andconverselyelectricfieldcangiverisetoelasticdeformation ,piezoelectricmaterialshave…  相似文献   

5.
A FORM INVARIANCE OF CONSTRAINED BIRKHOFFIAN SYSTEM   总被引:2,自引:0,他引:2  
IntroductionThestudyofthedynamicsofBirkhoffiansystemisanactivebranchinthemodernclassicalmathematicsandamoderndevelopingdirectioninmathematicphysics ,andcanbeappliedtoquantummechanics,statisticalmechanics ,biologicphysics,mechanicsofspaceflightandsomefie…  相似文献   

6.
ViscoelasticcharacteristicsofexpandedskinaftergraftingZengYanjun ,HuangKun ,XuChuanqing ,ZhangJing ,SunGuangci  (Ⅰ 1 )……………AgeneralrefinedshelltheoryfornonlinearanalysisoftiresZhangJianwu ,JiaLiping ,ShuYongping  (Ⅰ 8)…………………………………………Investigationofdynamicfra…  相似文献   

7.
IntroductionDynamicsanalysisofcrackedrotorwhenignoringnonlinearwhirlingcouldbefoundinmanyReferences [1 -3 ] .Nonlineardynamicsofcrackedrotorwithwhirlinghavebeenstudiedbasedonformerscholar’swork[4 ]andthewhirlingequationsofacrackedshafthavebeenestablished .Th…  相似文献   

8.
Afundamentalcharacteristicofplasmasistheir,abilitytosmearoutelectricfields.ThisisatypicalnonlinearproblemofsolvingthePoissonequation.Thepreviousstudyofthenonlinearproblemisusuallybasedonalinearizedmethodwhenthepotentialenergyoftheparticlesismuchsmalle…  相似文献   

9.
On the isometric isomorphism of probabilistic metric spaces   总被引:1,自引:0,他引:1  
IntroductionTherearetwokindsofisometricisomorphisminprobabilisticmetricspacetheory (see[1 -9] ) .ThefirstisthataPMspace (E ,F)isisometricallyisomorphictoanotherPMspace(E′,F′) ,andthesecondisthataPMspaces(E ,F)isisometricallyisomorphictoageneratingspaceofquasi_met…  相似文献   

10.
The effects of blood viscoelasticity on the pulse wave in arteries   总被引:1,自引:1,他引:0  
IntroductionThatthebloodhasviscoelasticpropertiesisawell_knownfact.TheresearchesforthebloodviscoelasticitybyG .B .Thurston[1~4]andS .Chien[5 ]showthatthebloodnotonlyappearstheviscoelasticityinvariousoscillatorybloodflows,butalsohasquitestrongelasticityinsome…  相似文献   

11.
IntroductionTheanalysisfordynamicproblemofelasticbodieshasbeenstudiedformanyyears.Basedonthemomentlessthinshelltheory ,HuthandCole[1]studiedthestresswaveinasphericalshellproducedbypressureloadsin 1 955.Mcivor[2 ]discussedtheflexuralstressandmembranestressina…  相似文献   

12.
IntroductionThediscoveryofquasicrystalaround 1 984 [1,2 ,3]issignificantbreakthroughforcondensedmatterphysicsinrecentyears.Thequasiperiodicsymmetryofsolidpresentsgreattheoreticalsignificance .Numerousquasicrystallinematerialswithstablepropertywereproduced ,thi…  相似文献   

13.
IntroductionWiththedevelopmentofnaturalscienceandtheincreasingrequirementintechnology,thelargedeflectionnonlinearproblemofbarsisalwaysanimportantresearchinengineeringapplicationfield.Inthe1960s,theresearchscopewasonlylimitedtoEuler’sElasticatheory,whichw…  相似文献   

14.
IntroductionBellows[1,2 ]isashellofrevolutionwithwrinkledmeridian ,usuallynamedafteritsmeridionalshapeinaperiodoritsprofileofaconvolution ,suchasΩ_shapedbellows,C_shapedbellows,U_shapedbellowsandsoon .Theyarewidelyusedinmanyfields,forexample ,theelasticsense…  相似文献   

15.
IntroductionAnumberofmaterialsinengineeringcanbeclassifiedinthecatalogofviscoelasticity ,includingrock ,soil,polymer,andER MRmaterialsetc .[Christensen 1 982 [1],TAO 1 999[2 ]] .Thedynamicanalysisofviscoelasticproblemsisrelatedtothetimedependentsolutions.Eventhoughdi…  相似文献   

16.
IntroductionDynamicstabilityanalysisofviscoelasticstructuresismuchmorecomplicatedsincethemathematicalmodelturnsouttobeasystemofintegro_partial_differentialequations,ratherthanasystemofpartialdifferentialonesasintheelasticstructure[1].Manyworkshavebeenp…  相似文献   

17.
IntroductionThetransientanalysisfor 3_Delastodynamiccrackproblemsisanimportantcontentinfracturemechanics.Becauseofthedifficultiesoftheproblems,thecalculationofDSIFfor 3_Dcrackisaproblemunsolvedcompletelyuptothepresent.Chen[1]firstlyusedthefinitedifference…  相似文献   

18.
Nomenclature x , y dimensionalabscissaandordinaterespec tively (m)l halflengthofthecrack (m)δ halfwidthofthecrack (m) t dimensionaltimevariable (s) w dimensionalverticaldisplacement (m) A/ ρ oneofthedimensionalparameterinRayleighdampingformula (s- 1 ) B/ ρ theotherdi…  相似文献   

19.
DETERMINATION OF CREEP PARAMETERS FROM INDENTATION CREEP EXPERIMENTS   总被引:3,自引:0,他引:3  
IntroductionCreepisthetimedependentplasticdeformationofmaterialswhichischaracterizedbyastrongdependenceofthecreepratefromstressσonconstanttemperatureT .Thesecondarycreeprate εdependsonstressσas ε=Cc·σnC, ( 1 )whereCcisaconstant,nCisthecreepstressexponent.Th…  相似文献   

20.
IntroductionMoreandmoreproblemsinscienceandengineeringhaveconcernedthestabilityanalysisoftheviscoelasticstructuresduetotheirbroadapplications .In [1]CederbaumandMondappliedthemultiple_scalesmethodtotreatstabilityofaviscoelasticcolumnunderaperiodicaxiall…  相似文献   

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