简介：Byusingthefinite-partintegralconceptsandlimittechnique,thehypersingularinte-grodifferentialequationsofthree-dimensional(3D)planarinterfacecrackwereobtained;thenthedominant-partanalysisof2Dhypersingularintegralwasfurtherusedtoinvestigatethestressfieldsnearthecrackfronttheoretically,andtheaccurateformulaewereobtainedforthesingularstressfieldsandthecomplexstressintensityfactors.Afterthat,anumericalmethodisproposedtosolvethehyper-singularintegrodifferentialequationsof3Dplanarinterfacecrack,andtheproblemofellipticalplanarcrackisthenconsideredtoshowtheapplicationofthemethod.Thenumericalresultsobtainedaresat-isfactory.

简介：马氏体域形成，进化和歼灭广泛地在superelasticNiTi多晶的形状存储器合金的导致压力的阶段转变被观察。由热力学的驱动力的计算和接口的磨擦动力学的加入，领域形态学和它的进化被追踪接口的技术成功地模仿。计算结果与张力的脱衣的试验性的观察同意很好。基于理论、计算的结果，我们在在不同领域模式之间的转变上讨论了批评驱动力和metastability的存在的效果。

简介：Thethermalstressofthequartzoscillatormodulepackagingisinvestigatedusingdistal-im-agecorrelationmethod(DICM),andtheexperimentalresultsaregiven.Underthequartzoscillatormodulepackaging,thequartzoscillatorandtheFe-Sn-Cualloyframearejoinedtogetherwiththeelectroconductiveadhesive(PI),andtheelectroconductiveadhesiveneedstobecuredtwiceat150℃and275℃respective-ly.AsthequartzoscillatorandtheFe-Sn-Cualloyframehaveadistinctdifferenceinboththermalexpansioncoefficientsandmechanicalpropertiesandinprocessofpackagingtemperaturerisesordrops,thethermalstressisyieldedeasily.Whiletemperaluredrops,thenormalstressatthequartzoscillatoredgeisatensilestress,whichcanmakethequartzoscillatorfracture.

简介：StresscalculationformulaeforaringhavebeenobtainedbyusingAirystressfunctionoftheplanestrainfieldwiththedecompositionofthesolutionsfornormalstressesofAirybiharmonicequationintotwopartswhenitisloadedundertwooppositeinsideforcesalongadiameter.Onepartshouldfulfillaconstraintconditionaboutnormalstressdistributionalongthecircumferenceatanenergyvalleytodotheminimumwork.Otherpartisastressresidueconstant.Inordertoverifytheseformulaeandthecomputedresults,thecomputedcontourlinesofequi-maximalshearstresseswereplottedandquitecomparedwiththatofphoto-elasticitytestresults.ThisconstraintconditionaboutnormalstressdistributionalongcircumferenceisconfirmedbyusingGreens’theorem.Anadditionalcompressionexistsalongthecircumferenceoftheloadedring,explainingthedivorcementanddisplacementofsingularitypointsatinnerandouterboundaries.

简介：这篇论文在小粒的材料的行为上论述micromechanical研究在下面限制砍使用一个三维的分离元素方法(DEM)。我们在DEM代码在球形的粒子之中把旋转抵抗看作说明粒子形状的效果的一个近似方法。在undrained下面砍，它被发现抵抗旋转可以帮助增加一个小粒的系统的shear力量并且提高它的抵抗到液化。在有不同起始的条件的小粒的系统的内部结构和anisotropy的进化描绘区分二张接触子网的一个清楚的bimodal字符。面对旋转抵抗，好关联在一种分析stress-force-fabric关系和DEM结果，正常力量anisotropy在起一个主导的作用之间被发现。在与小粒的anisotropy的关系的批评状态和液化状态的唯一的性质也被探索并且讨论。

简介：现在的工作解释限制为长棱柱的堆的自我重量传播的静电干扰在休息的一个角度倾向了并且相称性地在一个僵硬的底上形成了。有沿着斜坡表面的应力的动员状态的极化的主要的轴的闭合被在平衡方程上强加主要压力的取向采用。比较用一个有弹性的模型基于有限元素方法随计算被做。而且，在一个矩形的僵硬的底上扔的沙堆的实验被进行验证理论学习。测量压力侧面通常与理论结果同意了很好。

简介：TheSelf-SimilarCrackExpansion(SSCE)methodisproposedtoevaluatestressintensi-tyfactorsatcracktips,wherebystressintensityfactorsofacrackcanbedeterminedbythecrackopeningdisplacementoverthecrack,notjustbythelocaldisplacementaroundthecracktip.Thecrackexpansionrateisestimatedbytakingadvantageofthecrackself-similarity.Therefore,theaccuracyofthecalculationisimproved.Thesingularintegralsoncracktipelementsarealsoanalyzedandarepre-ciselyevaluatedintermsofaspecialintegralanalysis.Combinationofthesetwotechniquesgreatlyin-creasestheaccuracyinestimatingthestressdistributionaroundthecracktip.Avarietyoftwo-dimen-sionalcracks,suchassubsurfacecracks,edgecracks,andtheirinteractionsarecalculatedintermsoftheself-similarexpansionrate.Solutionsaresatisfiedwitherrorslessthan0.5%ascomparedwiththeanalyticalsolutions.Basedonthecalculationsofthecrackinteractions,atheoryforcrackinteractionsisproposedsuchthatforagroupofalignedcracksthesummationofthesquareofSIFsattherighttipsofcracksisalwaysequaltothatatthelefttipsofcracks.ThistheorywasprovedbythemehtodofSelf-SimilarCrackExpansioninthispaper.

简介：Aclosed-formsolutionforpredictingthetangentialstressofaninclusionlocatedinmixedmodeⅠandⅡcracktipfieldwasdevelopedbasedontheEshelbyequivalentinclusiontheory.Thenamixedmodefracturecriterion,includingthefracturedirectionandthecriticalload,wasestablishedbasedonthemaximumtangentialstressintheinclusionforbrittleinclusioninducedfracturematerials.Theproposedfracturecriterionisafunctionoftheinclusionfracturestress,itssizeandvolumefraction,aswellastheelasticconstantsoftheinclusionandthematrixmaterial.Thepresentcriterionwillreducetotheconventionaloneastheinclusionhavingthesameelasticbehaviorasthematrixmaterial.Theproposedsolutionsareingoodagreementwithdetailedfiniteelementanalysisandmeasurement.

简介：Thispaperisconcernedwiththenumericaltechniquebasedonthemethodofcharacter-isticsforthree-dimensionaldynamicthermoelasticproblems.Anumericalexampleforthethree-di-mensionalstresswavepropagationinathermoelasticbarofsquarecrosssectionsubjectedtobothanimpactloadingandathermalshockispresented.

简介：Stress-dependenceoftheintrinsictimeofviscoelasticmaterialsisinvestigated.Theinfluenceofstresslevelontheintrinsictimeisconsideredtobesimilartothatoflemperature,pressure,solventcon-centration,damageandphysicalaging.Thetime-lemperature-stressequivalenceprincipleisproposed,byemployingwhich,thecreepcurvesatdifferenttemperaturesandstresslevelscanbeshiftedintoamastercurveatreferencetemperatureandstresslevel.Thusthelong-termcreepbehaviorofviscoelasticmaterialsatalowertemperatureandstresscanbepredictedfromtheshort-termoneatahighertemperatureandstress.Asanexample,thenonlinearcreepbehaviorofhigh-densitypolyethylene(HDPE)atroomtemperatureisstudiedusingthetime-temperature-stressequivalenceprinciplepresented.

简介：Tsinghai-TibetPlateaubecomesanimportantresearchtopicofglobaltectonics,becauseofitsmarvelousthicknessandrapidupliftingsinceQuaternary.Byusingfiniteelementmethod,thenumericalsimulationiscarriedoutforthemovementofstructurallithosphere.Thedeformableelementsareemployedtosimulatestructuralzones,andthefrictionalmechanismisintroducedtoillustratethecharacteristicofazonewithacontactcracksurface.Theboundaryconditionsareprescribedbythedisplacementsaroundthepla-teau.Asaresult,thestressanddisplacementdistributionsareobtained,whichareconsistentwithPaxialorientationsoftheearthquakefocusmechanismandthemeasuredprincipalstressdirection.Analysisandes-timatearealsomadefortheevolutionofhistoricalprocessandpresentsituationoftheplateaulithosphere.

简介：Inthispaper,afiniteelementmethodisdevelopedtonumericallyevaluatetheshearcoefficientofTimoshenko'sbeamwithmultiplyconneetedcrosssection.Withfocusonanalyzingshearstressesdistributedattheneutralaxisofthebeam,animproveddefinitionoftheshearcoefficientispresented.Basedonthisdefinition,aGalerkin-typefiniteelementformulationisproposedtoanalyzetheshearstressesandsheardeflections.Numericalsolutionsoftheexamplesforsometypicalcross-sectionsarecomparedwiththetheoreticalresults.TheshearcoefficientoftowersectionsoftheTsingMaBridgeiscalculatedbyuseoftheproposedapproach,sothatthefiniteelementmodelingofthebridgecanbedevelopedwiththeaccuratevaluesofthesectionalproperties.

简介：Applyingtheparametricderivationmethod,PeierlsenergyandPeierlsstressarecalculatedwithanon-sinusoidalforcelawinthelatticetheory,whiletheresultsobtainedbythepower-seriesexpansionaccordingtosinusoidallawcanbededucedasalimitingcaseofnon-sinusoidallaw.ThesimplifiedexpressionsofPeierlsenergyandPeierlsstressareobtainedforthelimitofwideandnarrow.PeierlsenergyandPeierlsstressdecreasemonotonicallywiththefactorofmodificationofforcelaw.PresentresultscanbeusedexpedientlyforpredictionofthecorrectorderofmagnitudeofPeierlsstressformaterials.

简介：基于Zak的压力功能，有V槽口的双性人材料的压力奇特的eigen方程被获得。为双性人材料的垂直界面的V槽口的压力紧张因素的一个新定义被提出。效果砍模量和泊松是矩阵材料的比率，特征值上的属于的材料被分析。为双性人材料的垂直V槽口的精明的KI的概括表情借助于压力推测被获得。槽口深度，槽口角度和泊松的效果是V槽口的尖端附近的单个压力地上的材料的比率与数字模拟系统地被分析。作为一个例子，有在单轴的一致紧张下面的两倍边槽口的一个有限盘子被介绍的方法和对压力奇特的槽口角度和泊松的比率的影响在槽口的尖端附近计算被获得。

简介：Formulationintermsofhypersingularintegralequationsfortheinteractionbetweenstraightandcurvedcracksinplaneelasticityisobtainedusingthecomplexvariablefunctionsmethod.Thecurvedlengthcoordinatemethodandasuitablenumericalschemeareusedtosolvesuchintegralsnumericallyfortheunknownfunction,whicharelaterusedtofindthestressintensityfactor,SIF.

简介：Thedynamicstressintensityfactorhistoryforahalfplanecrackinanotherwiseunboundedelasticbody,withthecrackfacessubjectedtoatractiondistributionconsistingoftwopairsofcombinedmodepointloadsthatmoveinadirectionperpendiculartothecrackedgeisconsidered.Theanalyticexpressionforthecombinedmodestressintensityfactorsasafunctionoftimeforanypointalongthecrackedgeisobtained.ThemethodofsolutionisbasedontheapplicationofintegraltransformtogetherwiththeWiener-HopftechniqueandtheCagniard-deHoopmethod.Somefeaturesofthesolutionarediscussedandgraphicalresultsforvariouspointloadspeedsarepresented.

简介：Thedistributionofstressandstrainfieldsinamicro-structuralareaofaparticlereinforcedcompositeisstudiedbyacombinationofexperimentalandnumericalmethod(hybridmethod).Withtheex-perimentalvaluesofdisplacementsinamicro-regionastheboundaryloadingcondition,strainandstressfieldsinsidethemicro-regionarecalculatedbythefiniteelementmethodtmdertwodifferentkindsofmodel-ing,namely,asplanestressandplanestraincondition.Thedifferencesbetweenthetwokindsofmodelingconditionsasappliedtomicro-structuralareasarediscussed.

简介：在FRP的剥离开现象加强了具体横梁在这份报纸被调查。基于横梁理论和破裂力学，一个新理论模型被建议在FRP具体的接口附近分析剥离开行为，它被剩余管理热压力。数字例子被举提供清楚的卓见进失败机制。一些建议被为FRP的最佳的设计提供加强的结构。

简介：在有一个圆形或椭圆形的洞的结构的压力集中问题能被分析方法调查。为有一个矩形的洞的问题，仅仅近似的结果被导出。这份报纸在biaxial紧张下面与一个矩形的洞在盘子中推出分析答案到压力集中问题。由使用U转变技术和有限元素方法，有限元素方程的分析排水量溶液在系列形式被导出。因此，压力集中然后能容易并且方便地被讨论。为板问题，有四个节点的双线性的矩形的元素作为一个例子被拿表明建议方法的适用性。为到洞的宽度的高度的各种各样的比率的压力集中因素被获得。

简介：Inthispaper,thestresssingularityanalysisatthecracktiponelasticbi-materialinter-facesisconsidered.ThegoverningequationsofplaneelasticityinsectorialdomainarederivedtobeinHamiltonianformviavariablesubstitutionandvariationalprinciple.Themethodsofseparationofvariablesandconjugatesymplecticeigen-functionexpansionaredevelopedtosolvetheequationsinsectorialdomain.Thegeneralformulaeforthesolutionofstresssingularitiesatthecracktiponbi-ma-terialinterfacesareputforward,andanewsolutiontechniqueforfractureproblemsispresented.