简介：Inthisstudy,the3-dimensionaldiscreteelementmethodisfirstlyintroducedtoexplainthefracturingdamageprocessofthedynamicsplitexperimentofaspecialbrittleglassZnS.ThecorrespondingdynamicsplitexperimentisalsoperformedbyusingthesplitHopkinsonpressurebar.Thenthenumericalresultscorrespondcloselytothoseobtainedbyexperiments,andthefracturingdamagemodeshowsthatthesampleunderhighstrainrateloadingwouldcrackalongverticaldiameterinthebandregionbetweentwoloadingedges,whichdiffersfromthestaticdamagemode.Furthermore,bycomparingagroupofcontrastnumericaltests,thenumericalresultsprovethatloadingareauponthetopsideofsampleswouldinfluencethefracturemodeofdynamicsplitexperiments,whichindicatesthatthenarrowloadingplaneisbetter.

简介：纸论述cantilevered的气动弹性变形的特征合成翅膀，当一个合成扁平的盘子把压成薄片，理想化。合成把压成薄片与环氧基树脂由编织玻璃纤维制造了矩阵。laminate的有弹性、动态的性质为气动弹性变形的计算试验性地被决定。气动弹性变形的风隧道测试laminate被执行，结果显示出那拍翅，动态不稳定性发生了。cantilevered把也显示的限制周期振幅压成薄片，flutter以后摆动。试验性拍翅速度和频率被我们的计算分析验证。

简介：Inordertopredictthemechanicalperformanceofthepolyvinylchloride(PVC)atahighoperatingtemperature,aseriesofshort-termtensilecreeptests(onetenthofthephysicalagingtime)ofthePVCarecarriedoutat63Cwithasmallconstantstressbyadynamicmechanicalanalyzer(DMA).TheStruik-Kohlrausch(SK)formulaandStruikshiftingmethodsareusedtodescribethesecreepdataforvariousphysicalagingtime.AnewphenomenologicalmodelbasedonthemultiplerelaxationmechanismsofanamorphouspolymerisdevelopedtoquantitativelycharacterizetheSKparameters(theinitialcreepcompliance,thecharacteristicretardationtime,andtheshapefactor)determinedbytheagingtime.ItisshownthatthemomentarycreepcompliancecurveofthePVCat63CcanbeverywellfittedbytheSKformulaforeachagingtime.However,theSKparametersforthecreepcurvesarenotconstantduringtheagingprocessattheelevatedtemperatures,andtheevolutionoftheseparametersandthecreeprateversusagingtimecurvesatthedoublelogarithmiccoordinateshaveshownanonlinearphenomenon.Moreover,thecreepmastercurvesobtainedbythesuperpositionwiththeStruikshiftingmethodsareunsatisfactoryinsuchacase.Finally,thepredictedresultscalculatedfromthepresentmodelincorporatingwiththeSKformulaareinexcellentagreementwiththecreepexperimentaldataforthePVCisothermallyagedatthetemperaturerelativelyclosetotheglasstransitiontemperature.