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简介：Thispaperpresentsanewboundaryintegralequatiònfortwo-dimensionalelasticitywiththestresscomponentσijtitjasoneoftheboundaryvalues,wheretiisthedirectioncosineofthetangentontheboundary.ThisformofBEMhasanadvantageinthatthestresscomponentσijtitjontheboundarycanbecalculateddirectlyfromthenumericalsolution.Thepresentformulationforplaneproblemsusestwokernels,theoneislogarithmicallysingularandtheotheris1/rsingular.Theeffectivenessoftheapproachisalsodiscussedthroughtestexamples.

简介：Inmagneticresonanceelastography,oneseekstoreconstructtheshearmodulusfrommeasurementsofthedisplacementfieldinthewholebody.Inthispaper,wepresentanoptimizationapproachwhichsolvestheproblembysimplyminimizingadiscrepancyfunctional.Inordertorecoveracomplexanomalyinahomogenousmedium,wefirstobservethattheinformationcontainedinthewavefieldshouldbedecomposedintotwoparts,a'near-field'partintheregionaroundtheanomalyanda'far-field'partintheregionawayfromtheanomaly.Aswillbejustifiedboththeoreticallyandnumerically,separatingthesescalesprovidesalocalandprecisereconstruction.

简介：Thisletterreportstrafficflowsensitivitytovisco-elasticity,withthetrafficflowmodelingbrieflydescribedatfirstandthenusedtodotrafficflowsimulationswhoseresultscanreflectthepropertiesofspatial–temporalevolutionofringtrafficflow.Itrevealsthatvisco-elasticityplayscrucialroleinformationoftrafficflowpatterns,implyingthatself-organizationoftrafficflowiscrucialindeterminingtrafficflowstatus.

简介：Inthisarticle,byusingthestabilityofCauchytypeintegralwhenthesmoothperturbationforintegralcurveandtheSobolevtypeperturbationforkerneldensityhappen,wediscussthestabilityofthesecondfundamentalprobleminplaneelasticitywhenthesmoothperturbationfortheboundaryoftheelasticdomain(unitdisk)andtheSobolevtypeperturbationforthedisplacementhappen.Andtheerrorestimateofthedisplacementbetweenthesecondfundamentalproblemanditsperturbedproblemisobtained.

简介：Therelationsofallgeneralizedvariationalprinciplesinelasticityarestudiedbyemployingtheinvariancetheoremoffieldtheory.Theinfinitesimalscaletransformationinfieldtheorywasemployedtoinvestigatetheequivalenttheorem.Amongtheresultsfoundparticularlyinterestingarethoserelatedtothatallgeneralizedvariationalprinciplesinelasticityareequaltoeachother.Alsostudiedresultisthatonlytwovariablesareindependentinthefunctionalandthestress-strainrelationisthevariationalconstraintconditionforallgeneralizedvariationalprinciplesinelasticity.ThisworkhasprovenagaintheconclusionofProf.ChienWei-zang.

简介：<正>IntroductionThefundamentalproblemsofahalfplanewithanisotropicelasticityandtheperiodicfundamentalproblemsofahalfplanewithisotropicelasticitywererespectivelyinvestigatedbyS.G.Leknitskii[1]andLuChien-ke[2].Theseproblemsareformulatedonthecornplexz-planeintermsof

简介：Inthispaper,theauthorobtainsthemoregeneraldisplacementsolutionsfortheisotropicplaneelasticityproblems.Thegeneralsolutionobtainedinref.[1]ismerelytheparticularcaseofthispaper,Incomparisonwithref.[1],thegeneralsolutionsofthispapercontainmorearbitraryconstants.Thustheymaysatisfymoreboundaryconditions.

简介：TheStrohformalismismostelegantwhentheboundaryconditionsaresimple,namely,theyareprescribedintermsoftractionordisplacement.Formixedboundaryconditionssuchasthereforaslipperyboundary,theconcisematrixexpressionsoftheStrohformalismaredestroyed.WepresentageneralizedStrohformalismwhichisapplicabletoaclassofgeneralboundaryconditions.Thegeneralboundaryconditionsin-cludethesimpleandslipperyboundaryconditionsasspecialcases.ForGreen’sfunctionsforthehalfspace,thegeneralsolutionisapplicabletothecasewhenthesurfaceofthehalf-spaceisafixed,afree,aslippery,orothermoregeneralboundary.FortheGriffithcrackintheinfinitespace,thecrackcanbeaslit-likecrackwithfreesurfaces,arigidlineinclusion(whichissometimescalledananticrack),orarigidlinewithslipperysurfaceorwithothergeneralsurfaceconditions.ItisworthmentionthatthemodificationsrequiredontheStrohformalismareminor.Thegeneralizedformalismandthefinalsolutionslookverysimilartothoseofunmodifiedversion.Yettheresultsareapplicabletoaratherwiderangeofboundaryconditions.

简介：Thispaperpresentsasimplenonparametricregressionapproachtodata-drivencomputinginelasticity.Weapplythekernelregressiontothematerialdataset,andformulateasystemofnonlinearequationssolvedtoobtainastaticequilibriumstateofanelasticstructure.Preliminarynumericalexperimentsillustratethat,comparedwithexistingmethods,theproposedmethodfindsareasonablesolutionevenifdatapointsdistributecoarselyinagivenmaterialdataset.

简介：碳nanocones有相当迷人的电子、结构的性质，其轴的颤动很少在以前的研究被调查。在这份报纸，基于一个非局部的弹性理论，一个不一致的杆模型被使用在nanocones的轴的颤动上调查小规模的效果和不一致的效果。用修改Wentzel-Brillouin-Kramers(WBK)方法，一个asymptotic答案为一般不一致的nanorods的轴的颤动被获得。用类似的过程，然后，nanocones的轴的颤动为不一致的参数，模式数字和非局部的参数被分析。明确的表情为夹钳夹钳和夹钳免费的边界条件的模式频率被导出。因为对小长度规模的效果的无知，轴的颤动频率被古典杆模型高度过高估计，这被发现。

简介：在这份报纸，我们为与不连续的系数解决弹性问题与错误控制建议适应有限元素方法。在方法的网孔不需要适合接口。我们建立一基于剩余是独立趋于增加的常数的posteriori错误估计；Lam????D

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简介：Theexactformoftheexteriorproblemforplaneelasticityproblemswasproducedandfullyprovedbythevariationalprinciple.Basedonthis,theequivalentboundaryintegralequations(EBIE)withdirectvariables,whichareequivalenttotheoriginalboundaryvalueproblem,werededucedrigorously.TheconventionallyprevailingboundaryintegralequationwithdirectvariableswasdiscussedthoroughlybysomeexamplesanditisshownthatthepreviousresultsarenotEBIE.

简介：一条球形的人工的边界上的准确边界条件在这篇论文为线性弹性的三维的外面的问题被导出。在这个边界条件在人工的边界上被强加以后，仅仅在一个围住的领域定义的一个减少的问题被获得。如果一个人在变化明确的表达截断系列条款，有增加精确性的一系列近似问题能被导出，它等价于减少的问题。错误估计被介绍显示出错误怎么取决于有限elementdiscretization和近似问题的精确性。最后，一个数字例子被给表明建议方法的表演。

简介：Inthispaper,anewnumericalmethodfortheSignoriniprobleminthree-dimensionalelasticityispresented.Theproblemisreducedtoaboundaryvariationalinequalitybasedonanewrepresentationofthederivativeofthedoublelayerpotential.Furthermore,aboundaryelementprocedureisdescribedforthenumericalapproximationofitssolutionandanabstracterrorestimateisgiven.

简介：Constitutiverelationsaregivenforthedescriptionofthedeformationbehaviorofshapememorymaterials.Thedeformationisthesuperpositionoftheelastic,thethermalandthephasetransformationdeformationcausedbythetransformationfromonetotheotheramongthehightemperaturephase,thelowtemperaturephaseandthestressinducedphase.Thephasetransformationiscontrolledbythedrivingforce,i.e.,theGibbsenergydifferencebetweenthephases.

简介：ThispaperprovidesasolutionforthedegeneratescaleforN-gonconfigurationinantiplaneelasticityusingtheconformalmappingfunction,andthelowerandupperboundsforthedegeneratescaleforN=3,4,5,6,7,8,10,20,30,40,50,100,150and200,areevaluated.

简介：backgroundStudiesshowedthatarterialelasticitychangesappearearlierthananystructuralchanges,therefore,itsaccurateevaluationcouldbeappliedatearlystagetopreventdisease.Echo-tracking(E-tracking)techniquecantrackthewallmotiontrajectoryinreal-time,calculatethechangeinvasculardiameterautomatically,andassessmentofvascularstiffnessandflexibilitydirectly.Thisarticleaimstoassessthechangeofelasticityofcarotidarteryafterhormonetherapy(HT)usingEcho-trackingtechnology.MethodsEcho-trackingwasusedtoevaluatethecarotidelasticmoduli,suchasthepressure-strainelasticmodulus(Eρ),stiffnessparameter(β),arterialcompliance(AC),pulsewaveconductingvelocity(PWVβ)andaugmentationindex(AI)byAlokaα10colorDopplerultrasounddiagnosissystem.ResultsEρ,βandPWVβinHTgroupweresignificantlylowerthanthoseinthecontrolgroup(P<0.01),whileACwasobviouslyhigherthanthecontrolgroup(P<0.01).E2wasnegativelyrelatedtoβ,EρandPWVβ(r=-0.607,r=-0.573,r=-0.574,P<0.001),whilepositivelyrelatedtoAC(r=0.574,P<0.001);endothelial-dependentdilatation(EDD)wasnegativelyrelatedtoβ,EρandPWVβ(r=-0.521,r=-0.411,r=-0.456,P<0.001),whilepositivelyrelatedtoAC(r=0.443,P<0.001);ButIMTwaspositivelyrelatedtoβ,EρandPWVβ(r=0.553,r=0.444,r=0.529,P<0.001),whilenegativelyrelatedtoAC(r=-0.400,P<0.001).ConclusionsArterialstiffnessincreasesandcompliancedecreasesinmenopausalwomen.AsEDDdecreasesarterialelasticityrecedes,andHTcanimprovearterialelasticity.E-trackingtechnologycandiscovertheearlychangesinarterialstiffnesseffectivelyanditismoresensitiveinfindingoutthechangesofstiffnessinearlyatherosclerosisthanIMTofcarotidartery.