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简介：Theplasticload-bearingcapacityofductilecompositessuchasmetalmatrixcompositesisstudiedwithaninsightintothemicrostructures.Themacroscopicstrengthofacompositeisobtainedbycombiningthehomogenizationtheorywithstaticlimitanalysis,wherethetemperatureparametermethodisusedtoconstructtheself-equilibriumstressfield.Aninterfacefailuremodelisproposedtoaccountfortheeffectsoftheinterfaceonthefailureofcomposites.Thestaticlimitanalysiswiththefinite-elementmethodisthenformulatedasaconstrainednonlinearprogrammingproblem,whichissolvedbytheSequentialQuadraticProgramming(SQP)method.Finally,themacroscopictransversestrengthofperforatedmaterials,themacroscopictransverseandoff-axisstrengthoffiber-reinforcedcompositesareobtainedthroughnumericalcalculation.Thecomputationalresultsareingoodagreementwiththeexperimentaldata.

简介：Steel-concretecompositestructuresthatsharetheadvantagesofbothsteelstructureandconcretestructurehavebeendevelopedrapidlyandusedwidely.Ithasbeenapopularstructureinhigh-risebuildingsinrecentyears.Althoughmoreandmorecompositestructureshavebeenusedinearthquakearea,onlyafewliteraturesaboutfragilityanalysisofthistypeofstructureareavailable.Inthispaper,afragilityanalysismethodbasedonperformanceisproposed,inwhichboththeuncertaintyduetovariabilityinstructuresandgroundmotionareconsidered.Seismicfragilityanalysisisperformedfora15-storycompositebeam-concrete-filledsquaresteeltubecolumnframebytheproposedmethod.Thetop-drift-angleandthestory-drift-angleareusedasquantitativeindexestodefinethefourdifferentperformancelevels.Thenseismicdemandprobabilityanalysisiscarriedoutandfragilitycurvesarederivedtoassesstheseismicperformanceofthistypeofstructure.

简介：Inselectingrationaltypesofundergroundstructuresresistingexplosion,inordertoimprovestressstatesofthestructuralsectionandmakefulluseofmaterialstrengthofeachpartofthesection,theresearchmethodofcompositestructuresispresented.Adoptingtheanalysismethodofmicro-sectionfreebody,equilibriumequations,constraintequationsanddeformationcoordinationequationsaregiven.MakinguseoftheconceptofgeneralizedworkanddirectlyintroducingLagrangemultiplierspecificinphysicalmeaning,thevalidityoftheconstructedgeneralizedfunctionalisprovedbyusingvariationmethod.Therationalrigiditymatchingrelationshipofcompositestructuresectionispresentedthroughexamplecalculations.

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简介：在不同水和年龄和它充满力量的生长法律获得似水泥的材料的水和产品的作文和微观结构，合成似水泥的材料的最佳的比例根据波特兰水泥32.5R镇静的水泥clinker的化学作文被决定，CSA42.5sulphoaluminate水泥和二石膏(CS)。在不同水和年龄的合成似水泥的材料的描述被NMR，XRD和SEM技术进行。水和的机制被探索。测试的压缩力量随水和年龄的增加逐渐地堵住增加，这被显示出。合成似水泥的材料的微观结构能在水和过程从Al-O八面体被变成Al-O四面体。与Si-O四面体和Al-O四面体形成的含水的碱aluminiumsilicate。Si-O四面体的聚合的度逐渐地增加了，并且似水泥的材料的结构的力量继续增加。clinker矿物质的衍射山峰逐渐地与水和年龄的延期减少了。完全含水的CaSO4在导致了似水泥的材料的高早的力量的水和期间在船尾生产。合成似水泥的材料的早水和产品是在船尾与针酒吧结构。主要中间和最后一水和产品是有稠密的棱柱的形状的CSH胶化和CH胶化。合成似水泥的材料的显微镜的毛孔逐渐地减少了并且改进了充满块的以后的力量。强壮的支持我的外面被为区域提供。

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简介：Theboundaryelementmethodisusedforthemodalanalysisoffreevibrationof2-Dcompositestructuresinthispaper.Sincetheparticularsolutionmethodisusedtotreatthetermsofbodyforces(inertialforces)intheequationofmotion,onlystaticfundamentalsolutionsareneededinsolvingtheproblem.Foranisotropiccantileverbeam,thenumericalresultsobtainedbyusingtheBEMpresentedinthispaperareingoodagreement,withthoseofusingFEMorotherBEM,butthisBEMcanalsobeusedtoanalyzeproblemsforanisotropicmaterials.Forsimplysupportedcompositelaminatedbeams,thecomparisonsofthenumericalresultsobtainedbythismethodwiththeanalyticalresultsobtainedby1-Dlaminatedbeamtheoryindicatethatiftheratiooflength/thicknessisgreaterthan20,theresultsofthetwomethodsareingoodagreement,butiftheratiooflength/thicknessislessthan20,bigerrorswilloccurfor1-Dlaminatedbeamtheory.

简介：为有intra层和inter-laminar接口的损坏效果的合成把压成薄片的盘子的一个组成的模型被介绍。模型基于一般six-degreesof-freedom板理论，接口上的排水量的断绝被三个形状函数描绘，它根据解决方案被提出令人满意三个平衡方程。由使用变化原则，三维的非线性的平衡与二个不同损坏模型一起的把压成薄片的盘子的微分方程被导出。就有损坏的一个简单地支持的把压成薄片的盘子而言，然后，一个分析答案用有限差别方法被介绍获得inter-laminar压力。

简介：BasedontheSchaperythree-dimensionalviscoelasticconstitutiverelationshipwithgrowingdamage,adamagemodelwithtransversematrixcracksfortheunidirectionalfibrereinforcedviscoelasticcompositeplatesisdeveloped.ByusingKarmantheory,thenonlineardynamicgoverningequationsoftheviscoelasticcompositeplatesundertransverseperiodicloadingareestablished.ByapplyingthefinitedifferencemethodinspatialdomainandtheNewton-Newmarkmethodintimedomain,andusingtheiterativeprocedure,theintegral-partialdifferentialgoverningequationsaresolved.Someexamplesaregivenandtheresultsarecomparedwithavailabledata.

简介：一系列偏爱延期测试被执行有各种各样的方面比率的总的看来平凡的编织合成预先形成，透露不同方面比率可以导致不同起始的失败。一个精力方法被采用确定几个变丑模式。由要求的精力的比赛，起始的失败被预言，显示出有试验性的观察的好一致。现在的研究的结果为材料在偏爱延期测试的行为的进一步的理解是珍贵的。它也为建模提供一个有效方法材料在另外的更复杂的形成过程的formability。

简介：Laminatedcompositematerialsarewidelyimplementedinseveralengineeringconstructions.Foritsrelativelightweight,thesematerialsaresuitableforaerospace,military,marine,andautomotivestructuralapplications.Toobtainsafeandeconomicalstructures,themodellinganalysisaccuracyishighlyrelevant.Sincemeshlessmethodsintherecentyearsachievedaremarkableprogressincomputationalmechanics,thepresentworkusesoneofthemostflexibleandstableinterpolationmeshlesstechniqueavailableintheliterature—theRadialPointInterpolationMethod(RPIM).Here,a2Dapproachisconsideredtonumericallyanalysecompositelaminatedbeams.Boththemeshlessformulationandtheequilibriumequationsrulingthestudiedphysicalphenomenonarepresentedwithdetail.Severalbenchmarkbeamexamplesarestudiedandtheresultsarecomparedwithexactsolutionsavailableintheliteratureandtheresultsobtainedfromacommercialfiniteelementsoftware.Theresultsshowtheefficiencyandaccuracyoftheproposednumerictechnique.

简介：由考虑界面的损坏并且用变化原则的效果，有界面的损坏的把压成薄片的盘子的三维的非线性的动态管理方程向精确压力分析基于一般six-degrees-of-freedom塔板理论被导出。为有界面的损坏的一个简单地支持的把压成薄片的盘子的interlaminar应力和非线性的动态反应的答案被使用有限差别方法获得，并且结果被比较与非线性的有限元素方法的答案验证。在数字计算，在接口和把压成薄片的盘子的非线性的动态反应的压力上的界面的损坏的效果被讨论。

简介：一个一般理论模型被开发在点刺激力量下面从一个无限的直角地使硬的盘子调查健全放射。板能金属性或合成，并且装载的液体也在研究被考虑。第一份订单砍变丑理论被用来说明横向砍变丑。运动同等地，spacedstiffeners被考虑他们的弯曲颤动和扭力的运动检验。基于周期的结构理论和板的相等的动态灵活性的概念，模型的概括vibro声学的方程被使用Fourier变换方法获得。能数字地被解决的概括模型被把模型预言与存在结果作比较验证。数字计算被执行在直角地使硬的板的健全放射特征上调查刺激，stiffeners的间距，板厚度，加强的形式和纤维取向的地点的效果，并且一些实际结论从这些参数研究被得出。

简介：Basedonhighorderdynamicneuralnetwork,thispaperpresentsthetrackingproblemforuncertainnonlinearcompositesystem,whichcontainsexternaldisturbance,whosenonlinearitiesareassumedtobeunknown.Asmoothcontrollerisdesignedtoguaranteeauniformultimateboundednesspropertyforthetrackingerrorandallothersignalsintheclosedloop.Certainmeasuresareutilizedtotestitsperformance.Noaprioriknowledgeofanupperboundonthe'optimal'weightandmodelingerrorisrequired;theweightsofneuralnetworksareupdatedon-line.Numericalsimulationsperformedonasimpleexampleillustrateandclarifytheapproach.

简介：这个工作处理合并magnetorheological弹性体的机械结构的颤动的活跃控制。抑制系数并且砍弹性体增加的模量当暴露了到一个磁场时。与弹性体永久地暴露于一个磁场的颤动控制相比，整个时间的这个过程的控制更有效地减少颤动。为充满弹性体的一根三明治横梁的颤动的试验性的学习被进行，用Abaqus代码由数字研究列在后面。抑制的颤动被发现依赖于在弹性体的微尺寸的铁磁性的粒子的装载的率。

简介：Theproblemconsideredhereistheresponseofanon-homogeneouscompositematerialcontainingsomecrackssubjectedtodynamicloading.Itisassumedthatthecompositematerialisor-thotropicandallthematerialpropertiesdependonlyonthecoordinatey(alongthethicknessdirection).Intheanalysis,theelasticregionisdividedintoanumberofpliesofinfinitelength.Thematerialpropertiesaretakentobeconstantsforeachply.ByutilizingtheLaplacetransformandFouriertransformtechnique,thegeneralsolutionsforpliesarederived.Thesingularintegralequa-tionsoftheentireelasticregionareobtainedandsolvedbythevirtualdisplacementprinciple.Attentionisfocusedonthetime-dependentfullfieldsolutionsofstressintensityfactor(SIF)andstrainenergyreleaserate.Asanumericalillustration,thedynamicstressintensityfactorofasubstrate\functionallygradedfilmstructurewithtwocracksundersuddenlyappliedforcesoncracksfacearepresentedforvariousmaterialnon-homogeneityparameters.

简介：Thestraindifferenceofsteelandconcreteunderverticalconcentratedloadwasanalyzedonthebasisofelastictheory,andwascomparedwithidealsolutionofsteelandconcreteunderverticaluniformload.Theresultsindicatethatthecomputingformulaconcludedfromthepaperisbelievable.Thepracticalstructureusuallybearsconcentratedload,soitcanbeusedinthepracticalengineering.

简介：受到时间依赖者脉搏的一个把压成薄片的混合合成盘子的非线性的动态回答被调查。板的动态方程被虚拟工作原则的使用导出。几何非线性效果与vonK獲愠敲搠灥湥敤瑮漠?瑳敲獳獥愠?桷捩?桴?桳晩獴愠敲愠灰楬摥?桷汩?桴?楴敭猭牴獥?桳晩?慦瑣牯?牡?敤数摮湥?湯琠浥数慲畴敲s被考虑

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