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1.
IntroductionAsRef.[1 ]pointedout,inaturbinecascadewithtipclearance,mostofthesingularpointsandseparationlines,duetotheeffectoftheleakageflow ,arelocatedattheupperhalfspan(especiallyinitssuctionsurfacecorner) ,whichconsequentlyleadstoworsetheaerodynamiccharac… 相似文献
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Thethreshold_crossingofstochasticprocessesisaproblemoftenencounteredinthestudyofvariousphysicalphenomena .Theterm ,threshold_crossing ,isusedtoindicateacertainfixedvaluebeingcrossedbytheoscillatingrealizationζ(1) (t)ofastochasticprocessζ(t) ,asshownbythetypi… 相似文献
3.
IntroductionInthestrengthofmaterials[1],inordertoeliminatetheadditionaltorsioninathin_walledcylinderwithopencross_sectionunderbendingbyatransverseforce,itissufficienttoremovethetransverseforceatthebendingcenter.Thereforeanapproximatemethodtocalculatethe… 相似文献
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IntroductionCompositematerialsarealmostmadeupoffiberandmatrixwithanisotropicmacrostructure ,whosevariousstructuresareeasytoappearapenny_shapedmicrocrackintheprocessoftheirwork.Whenitextendsgradually ,thestructurewillleadtodestruction .Itiswell_knownthat… 相似文献
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IntroductionForgeomaterialssuchasrockandconcrete,thefrictionalslidingalongmicrocracksurfacesisassociatedwiththeplasticitymodeldescribedbytheMohr_Coulombtheory ;moreovercrackpropagationcorrespondstodamagegrowth .Thecouplingofdamageandplasticityofaphenom… 相似文献
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IntroductionWhenastaticallyindeterminatetrusshasalowerloadcapacityowingtothetremendousdifferenceofinternalforcesofbars,itdoesn’tlayingoodworkingstate.Toincreasethecapacity ,cross_sectionalareasofelementsareoptimizedbytheprogrammingmethodandthecriterion… 相似文献
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IntroductionThebasicfunctionofthemicrocirculationistoallowrapidexchangeofwater,gases,nutrientsandwasteproductsbetweenthebloodandtissuecells.Amicrocirculationunitthereforeconsistsofmicrovessels(arterioles,capillaries,venules,thoroughfaresandarteriole_… 相似文献
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IntroductionAnaturalorartificialmaterialisusuallymicroscopicallyheterogeneousandownsacertainmicrostructurecomprisingthematerialconstitutions (crystalloid ,dislocations ,phasetransformations,micro_cracks,voids,fibers,inclusions) .Itisnotsurprisingthatanumbe… 相似文献
9.
付宝连 《应用数学和力学(英文版)》2002,23(2):203-210
IntroductionInthree_dimensionalphotoelasticity ,photoplasticity ,simulatingexperimentsofbuildingstructuresandphysicalsimulationsofmetalformingprocesses,thereiseachandallanidenticalproblemsforstudy ,thatis,greaterrorsareusuallycausedbythesuppositionthatth… 相似文献
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IntroductionOneoftheprimaryproblemsingoetechnicalengineeringistoconstructasoilconstitutivemodelapplicabletogeneral 3_Dstressstates.Althoughmanytypesofconstitutivemodelshavebeenproposed ,fewcantakeproperaccountofthedirectionalchangeofstressvector (i.e .,ro… 相似文献
11.
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
12.
Althoughtheconstrainedtwistproblemsofthin_wallstraightbarsofisotropicand/oranisotropicmaterials,withclosedoropencross_sections,havebeenwellsolved[1~3],forspatialcurvedbarsofthistypeofproblemstherehasnotbeenanysatisfactorysolutionuptonow.Thisproblemis… 相似文献
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IntroductionAnunevendistributionoftheclearanceofvane_tipalongthecircumferenceorientationcausedbytherelativeeccentricitybetweenimpellerandcylinderofsteamturbinewillresultunequalpneumaticforceofthevanesatthesamestage .Asaresult,inadditiontoatorque,thetra… 相似文献
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IntroductionThecomprehensivemathematicalmodeldevelopedinthefirstpartofthispaper[1]containsdozensofcoupledequationsthatformalargenonlinearequationsystem.Herewecombineanalyticalandnumericalmethodstosolveitanddiscussandanalyzesomeimportantproblemsinmicroc… 相似文献
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IntroductionFatiguefractrueisaprimarymodeoffailureformetallicstructuresandmechanicalsystemssubjectedtovariousdynamicloads.Atthebeginningofservice,someinherentdefectssuchasmicrocracks,weldingdefects,notches,voidsetc.existinmanystructuresorelements.Thesed… 相似文献
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IntroductionThestudyofrandomparametricexcitedsystemsaremoreimportantthanthatofrandomexternalexcitedones,andaretheoreticallymoredifficultespeciallywhentheexcitationsarenarrow_bandrandomprocesses[1].Inthecasewhenthesystemsareexcitedbycombineddeterministi… 相似文献
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IntroductionThetransientphenomenaofdynamicproblemsandthemannerstotreatthemaregenerallyrelatedtothespectralcharacteristicsofexcitation .Onemayomitpropagatingwavesifrelativelylowerfrequenciesgoverntheresponsesintheproblemssuchasseismicresponsesandrespon… 相似文献
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IntroductionSinceDienes(1979),NagtegalandDeJong(1982)etalhadocasionalyfoundthephenomenaofsimpleshearoscilationusingthegeneral... 相似文献
19.
黄再兴 《应用数学和力学(英文版)》1999,(7)
IntroductionAsageneralizationoftheclasicalfieldtheory,nonlocalfieldtheorycanbeusedasthetheoreticalbaseinmacro_micromechanicsb... 相似文献
20.
IntroductionTheRef.[1 ]pointedoutthatsometypicalnonlinearwaveequationspossessedfivecommonfactors,whichwerewithsolitarysolutions,infiniteconservedlaws,exactlysolvableevolutionequationsbytheuseofinversescatteringmethod .B cklundtransformations,beingreducedto… 相似文献