简介：Undertheconditionthatallthestresscomponentsatacrack-tiparethefunctionsofθonly,makinguseofequilibriumequationsandhydrostaticstress-dependentyieldcondition,inthispaper,wederivethegenerallyanalyticalexpressionsofthehydrostaticstress-dependentperfectly-plasticstressfieldsatastationaryplane-stresscrack-tip.Applyingthesegenerallyanalyticalexpressionstotheconcretecracks,theanalyticalexpressionsofhydrostaticstress-dependentperfectly-plasticstressfieldsatthetipsofmodeⅠandmodeⅡcracksareobtained.

简介：Ithasbeenwellrecognizedthat,duetoanisotropicpackingstructureofgranularmaterial,thetruestressinaspecimenisdifferentfromtheappliedstress.However,veryfewresearcheffortshavebeenfocusedonquantifyingtherelationshipbetweenthetruestressandappliedstress.Inthispaper,wederiveanexplicitrelationshipamongappliedstresstensor,material-fabrictensor,andforce-fabrictensor;andweproposearelationshipbetweenthetruestresstensorandtheappliedstresstensor.Thevalidityofthisderivedrelationshipisexaminedbyusingthediscreteelementsimulationresultsforgranularmaterialunderbiaxialandtriaxialloadingconditions.

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简介：ThestressrateintegralequationsofelastoplasticityarededucedbasedonRef.[1]byconsistentmethods.Thepointatwhichthestressesand/ordisplacementsarecalculatedcanbeinthebodyorontheboundary,andintheplasticregionorelasticone.Theexistenceoftheprincipalvalueintegralintheplasticregionisdemonstratedstrictly,andthetheoreticalbasisispresentedforthepaticularsolutionmethodbyunitinitialstressfields.Inthepresentmethod,programmingiseasyandgeneral,andthenumericalresultsareexcellent.

简介：Whethertheconceptofeffectivestressandstraininelastic-plastictheoryisstillvalidundertheconditionoffinitedeformationwasmainlydiscussed.Theuni-axialcompressionexperimentsinplanestressandplanestrainstateswerechosenforstudy.Inthetwokindsofstressstates,thestress-straincurvedescribedbylogarithmstrainandrotatedKirchhoffstressmatchestheexperimentsdatabetterthanthecurvesdefinedbyotherstressstraindescription.

简介：Residualstressinducedduringmanufacturingofinjectionmoldedcomponentssuchaspolymethylmethacrylate(PMMA)affectsthemechanicalandopticalpropertiesofthesecomponents.Theseresidualstressescanbevisualizedandquantifiedbymeasuringtheirbirefringence.Inthispaper,alowbirefringencepolariscope(LBP)isusedtomeasurethewhole-fieldresidualstressdistributionoftheseinjectionmoldedspecimens.Detailedanalyticalandexperimentalstudyisconductedtoquantifytheresidualstressmeasurementinthesematerials.Acommercialbirefringencemeasurementsystemwasusedtovalidatetheresultsobtainedtoourmeasurementsystem.Thisstudycanhelpinmaterialdiagnosisforqualityandmanufacturingpurposeandbeusefulforunderstandingofresidualstressinimagingorotherapplications.

简介：Thebasicrelationsinlinearisotropicphotoviscoelasticityhavebeentheoreticallydiscussedinde-tails.Anewroutinehasbeenfoundtoobtainthetime-dependentprincipalstresswithoutthemeasurementofisoclinics.Asatestofourmethod,examplesaregivenattheendofthispaper.

简介：Inthepresentpaper,thecompatibilityequationfortheplanestressproblemsofpower-lawmaterialsistransformedintoabiharmonicequationbyintroducingtheso-calledcomplexpseudo-stressfunction,whichmakesitpossibletosolvetheelastic-plasticplanestressproblemsofstrainhardeningmaterialsdescribedbypower-lawusingthecomplexvariablefunctionmethodlikethatinthelinearelasticitytheory.Byusingthisgeneralmethod,theclose-formedanalyticalsolutionsforthestress,strainanddisplacementcomponentsoftheplanestressproblems’ofpower-lawmaterialsisdeducedinthepaper,whichcanalsobeusedtosolvetheelasto-plasticplanestressproblemsofstrain-hardeningmaterialsotherthanthatdescribedbypower-law.Asanexample,theproblemofapower-lawmaterialinfiniteplatecontainingacircularholeunderuniaxialtensionissolvedbyusingthismethod,theresultsofwhicharecomparedwiththoseofaknownasymptoticanalyticalsolutionobtainedbytheperturbationmethod.

简介：Thedeterminationofstructuraldynamicstressspectrumdistributionisofgreatsignificanceinthestructuralfatiguestrengthevaluationaswellasreliabilitydesign.Inpreviousempiricaldataprocessingmethods,thedatagroupinganddistributionfittingwereexcessivelycoarseandcontaineddistinctivedefects.Thispaperproposedaneffectiveapproachtostatisticallygroupactualmeasureddynamicstressdataandvalidlyextrapolatethecombineddistributiontofitthedynamicstressspectrumdistribution.Thisapproachhasbeenverifieditseffectivenessthroughchi-squaretest,stressspectrumextrapolationanddamagecalculationindynamicstressstudy.

简介：Theobjectivestressrateisaratherimportantprobleminmechanicsoffinitedeformation.Inthispaper,theobjectivestressrateinco-movingcoordinateisderivedbyapplyingnonlineargeometricfieldtheoryofdeformation.Problems.suchaxlargeextensioncoupledwithrotation,andlargesheardeformation,areexemplifiedbyusingthenewformula.ComparingwithJaumann’sstressrateandotherformulaepresentedincurrentliterature,thenewresultappearstobethereasonableoneinco-movingcoordinatesystem.

简介：Theapplicabilityandlimitationofseveralquadraticstrengththeorieswereinvestigatedwithrespectto2D-C/SiCand2.5D-C/SiCcomposites.Akindofdamage-basedfailurecriterion,referredtoasD-criterion,isproposedfornonlinearceramiccomposites.Meanwhile,thenewlydevelopedcriterionispreliminarilyvalidatedundertension-shearcombinedloadings.ThepredictionshowsthatthefailureenvelopegivenbyD-criterionislowerthanthatfromTsai–HillandHoffmancriteria.Thisrevealsthatthedamage-basedcriterionisreasonableforevaluationofdamage-dominatedfailurestrength.

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简介：AlthoughrainfallisrareontheLoessPlateauofwesternChina,landslidesoccurfrequentlythereinrainyseason.Surveysreportthatlandslidehazardsalwaysfollowheavyrains.Inthisstudy,aseepage-stresscouplingmodelforrainfallinducedlandslideisusedtoexamineanactualdisastrouseventinYulinbytheendofJuly,2017.Theeffectsofrainfallduration,rainfallintensityandsoilweakeningonslopestabilityarestudiedindetail.Theresultsillustratethatthesafetyfactordropssharplyatfirstandthenisgraduallydecliningtobelow1.05duringadditionaltwodaysofheavyrain.Withsoilstrengthsofteningconsidered,theslopewouldbemoreunstable,inwhichtheweakeninginsoilcohesionisfoundtobeamoresensitivefactor.

简介：Theequationofstressintensityfactors(SIF)ofinternallypressurizedthick-walledcylinderwasusedasthereferencecase.SIFequationofrotatingthick-walledcylindercontainingaradialcrackalongtheinternalborewaspresentedinweightfunctionmethod.Theweightfumctionformulaswereworkedoutandcanbeusedforallkindsofdepthofcracks,rotatingspeed,material,sizeofthick-walledcylindertocalculatethestressintensityfactors.Theresultsindicatedthevalidityandeffectivenessoftheseformulas.Meanwhile,therulesofthestressintensityfactorsinrotatingthick-walledcylinderwiththechangeofcrackdepthsandtheratioofouterradiustoinnerradiuswerestudied.Thestudiesarevaluabletoengineeringapplication.

简介：TheIsodynetechniquebasedonthescatteredlightscanningfromathinlaserbeamcanbeusedtoobtaintheinformationinsidetheloadedobjectintheroomtemperaturenondestructively,soitisaverypowerfultechniquein3Dstressanalysis.Theproblemsarehowtointerprettheinformationandhowtogetsufficientinformationfromthefewinterferencefringe.Birefringencephaseshifttechniquecandistinguishthefringeordersautomaticallyandenrichtheinformationin256graylevelsbetweenmaximandminimlightintensity.InthepapertheIsodynebirefringencephaseshiftmethodwithanobliqueincidenceandequilibriumequationispresented,bywhichthe3DstressesinthemiddleplaneofaplatewithUshapenotchareseparatedsuccessfully.

简介：Thestress-inducedmagneticdomainswitchinginFeGathinfilmsisstudiedusingphase-fieldmethod.Inparticular,themagneticfieldisappliedalongthe[110]directionandbiaxialstressesareappliedalong[100]and[010].Acompressivepre-stresscorrespondstoasmallercoercivemagneticfieldwhileatensilepre-stresscorrespondedtoalargercoercivefield.Atthesametime,itisalsofoundthatthetransitionbetweenbutterflyandsquare-likemagnetostrictionloopsoccursatthecriticaloppositebiaxialstressstate.Thetwodifferentevolutionscorrespondtotwodifferentmechanisms:oneisthatthesingledomainswingsacrossafanareabackandforth;theotheristhatthesingledomainturnsaclockwisecircle.Theresultscanbeexplainedbythestresstunedanisotropyenergywell.

简介：有在紧张和压缩的不同moduli的材料被称为双性人模量材料。Graphene是有最高的力量和最薄的厚度的如此的一种材料。在这份报纸，受到温度效果并且放了在Winkler地基上的双性人模量横梁的机械反应被学习。关于中立的轴位置和双性人模量基础横梁的正常紧张的未经决定的参数的微分方程被建立。然后，地基横梁的正常压力，弯曲时刻，和排水量的分析表情被导出。同时，一个计算过程基于有限元素方法(女性)被开发获得双性人模量结构的温度压力。获得的双性人模量解决方案能恢复古典模量解决方案，这被显示出，并且结果由分析表达式，现在的女性的过程，和传统的女性的软件获得是一致的，它验证现在的分析模型和过程的精确性和可靠性。最后，双性人模量结果之间的差别和古典一样的模量结果被讨论，并且为在实际工程计算并且优化某些双性人模量成员的几个合理建议被介绍。

简介：ThespecificsignofReynoldsstressintheboundarylayeronaflatplateatzeroincidenceisnewlyinterpretedinpresentpaperbasedonthetheoryofvortex-inducedvortex.Itavoidssomeproblemsappearedinatraditionalexplanation,onthebasisofrelationshipbetweenmeanandfluctuatingflowsduetothetransportofmomentum.Throughtheanalysisoflocalflowfieldintheimmediateneighborhoodofwall,thecharacteristicsofReynoldsstressareidentifiedthroughintroducingturbulence-inducedsmall-scalestreamwiseeddiesabovetheflatplate.ThepositiveReynoldsstressistheoreticallyverified.AndsuchnewinterpretationillustratesthatthegenerationofReynoldsstress,aswellasfluctuatingvelocity,isintrinsicallyindependentofthemeanflow.Butitsspecificsignwouldbedeterminedbythemeanflowduetotheinertialforces.Otherfeatures,suchastheintensityrelationshipamongthreecomponentsoffluctuatingvelocity,arealsopresented.

简介：为有一个横向的裂缝的一条半长带的飞机橡皮问题被调查。起始的问题被一个不可分的转变方法的使用与一个概括计划归结为一个一个维的连续问题。一个维的问题首先作为一个向量边界问题被提出，然后归结为三个单个不可分的方程(SIE)的一个系统。系统被一个直角的多项式方法和一个特殊概括方法的使用解决。这个工作的贡献是核的考虑在解决系统的固定奇特。相对半长带的裂缝长度和它的地点侧面的方面被调查简化问题陈述。这简化把起始的问题归结为二SIE的一个系统。

简介：AvirtualTaylorimpactofcellularmaterialsisanalyzedwithawavepropagationtechnique,i.e.theLagrangiananalysismethod,ofwhichthemainadvantageisthatnopre-assumedconstitutiverelationshipisrequired.Timehistoriesofparticlevelocity,localstrain,andstressprofilesarecalculatedtopresentthelocalstress–strainhistorycurves,fromwhichthedynamicstress–strainstatesareobtained.Thepresentresultsrevealthatthedynamic-rigid-plastichardening(D-R-PH)materialmodelintroducedinapreviousstudyofourgroupisingoodagreementwiththedynamicstress–strainstatesunderhighloadingratesobtainedbytheLagrangiananalysismethod.ItdirectlyreflectstheeffectivenessandfeasibilityoftheD-R-PHmaterialmodelforthecellularmaterialsunderhighloadingrates.