简介：

简介：

简介：

简介：Byusingthefundamentalequationsofaxisymmetricshallowshellsofrevolution,thenonlinearbendingofashallowcorrugatedshellwithtaperunderarbitraryloadhasbeeninvestigated.ThenonlinearboundaryvalueproblemofthecorrugatedshellwasreducedtothenonlinearintegralequationsbyusingthemethodofGreen'sfunction.Tosolvetheintegralequations,expansionmethodwasusedtoobtainGreen'sfunction.ThentheintegralequationswerereducedtotheformwithdegeneratecorebyexpandingGreen'sfunctionasseriesofcharacteristicfunction.Therefore,theintegralequationsbecomenonlinearalgebraicequations.Newton'siterativemethodwasutilizedtosolvethenonlinearalgebraicequations.Toguaranteetheconvergenceoftheiterativemethod,deflectionatcenterwastakenascontrolparameter.Correspondingloadswereobtainedbyincreasingdeflectiononebyone.Asanumericalexample,elasticcharacteristicofshallowcorrugatedshellswithsphericaltaperwasstudied.Calculationresultsshowthatcharacteristicofcorrugatedshellschangesremarkably.Thesnappinginstabilitywhichisanalogoustoshallowsphericalshellsoccurswithincreasingloadifthetaperisrelativelylarge.Thesolutionisclosetotheexperimentalresults.

简介：Thispaperanalysesamathematicalmodelofthepatternformationontheshellofmolluscswhichisactuallyakindofreaction-diffusionsystem.TheexistenceanduniquenessofaglobalsmoothsolutionofthissystemwithCauchyproblemanditsstabilityandtimedecayratearestudiedbymeansofanelementaryenergymethod.

简介：BasedonKármán’snonlinearfundamentaldifferentialequations,thenewapproach,whichcombinesmodifiediterationmethodwithGalerkin’sone,hasbeenputforwardtosolvenonlinearbendingofshallowsphericalshellwithconcavebaseandclampededgesonthePasternakfoundationunderuniformloadsinthispaper.Mathematicalexpressionofload-deflectionhasbeengiven;furthermore,resultsobtainedareingoodagreementwithexistentones.

简介：Thispapergivesallthetwo-dimensionalmembranemodelsobtainedfromformalasymptoticanalysisofthethree-dimensionalgeometricallyexactnonlinearmodelofathinelasticshellmadewithaSaintVenant-Kirchhoffmaterial.Therefore,theothermodelscanbequotedasflexuralnonlinearones.Theauthoralsogivestheformalequationssolvedbytheassociatedstresstensorandpointsoutthatonlyoneofthosemodelsleads,bylinearization,tothe“classical”linearlimitingmembranemodel,whosejuetificationhasalreadybeenestablishedbyaconvergencetheorem.

简介：同学们，现在让我们一起来学习第六单元吧!在本单元，大家将通过谈论做某事多长时间了，以及自己与别人的兴趣爱好来学习现在完成进行时，并且通过教材的各个环节的学习来体会现在完成进行时与一般过去时的区别。并为以后正式学习现在完成时打好基础。本单元的语法内容是现在完成进行时，对于同学们来讲，可能有些难哦，现在请同学们跟我一起来学习。

简介：-Thispaperadoptsapproximateformulasforresidualstressescausedbycoldbendingforplateswithstress-straincurveforma=Kn.Atypicaldistributionofthelongitudinalresidualstressduetoweldingisalsoassumed.Theeffectsofresidualstressduetocoldbendingandweldingonplasticbucklingofaxiallycompressedcylindricalshellsarestudiedbythefiniteelementmethod.

简介：用机能上地分级的材料(FGM)做的圆柱的壳的热弄弯行为被学习。材料成分由组成陶器并且金属。越过壳厚度的材料性质被假定以混合物的体积部分规则根据简单幂定律分布被分级。基于Donnell壳理论，以排水量部件弄弯的无尺寸的部分微分方程的一个系统被导出。变量的分离的方法被用来转变管理方程到平常的微分方程(颂诗)。一个射击方法被用来在边界条件的二种类型下面寻找微分方程的数字答案。幂定律索引，无尺寸的几何参数，和批评弄弯温度上的温度比率的效果详细被讨论。

简介：

简介：ＩｎｔｒｏｄｕｃｔｉｏｎＩｍｐｏｒｔａｎｔａｐｌｉｃａｔｉｏｎｓｏｆｔｈｅｓｔａｂｉｌｉｔｙａｎａｌｙｓｉｓｏｆｓｈｅｌｓｃａｎｂｅｆｏｕｎｄｉｎｔｈｅｍｏｄｅｒｎｅｎｇｉｎｅｒｉｎｇｒａｎｇｉｎｇｏｖｅｒｔｈｅａｅｒｏｓｐａｃｅ，ｍａｒｉｎｅ，ａｒ...

简介：在水下圆柱的壳结构被发现了一许多设计领域里的申请宽例如水兵的元素，给平台上油，等等。联合颤动分析是为这些的一个热问题在水下结构。颤动特征在水下结构不仅被水动力学压力而且由相应于不同的水深度的静水力学的压力影响。在这研究，一个声学的有限元素方法被用来评估在水下结构。以起始的压力僵硬考虑静水力学的压力，听觉的液体结构联合了分析在水下圆柱的壳被做了在自然频率和健全放射上学习水动力学压力的效果。由与频率基于Bessel功能由声学的有限元素方法并且由增加的集体方法获得了作比较，现在的分析的有效性被检查。最后，使硬的圆柱的壳的健全放射的测试样品被泛音获得声学的分析。结果证明静水力学的压力在与水深度决定健全放射变化的一个大沉没身体运动，和特征起一个重要作用。而且，分析方法和结果具有为另外的复杂海底的结构的研究的重要参考价值。

简介：Inthiswork,dynamiccompositeanalysistruncatedsandwichconicalshells(STCS)withdifferentboundaryconditionsunderlowvelocityimpactwasinvestigatedanalytically,accordinghigherordersandwichpaneltheory.ImpactoccurredatthetopfacesheetandthecontactforcehistoryispredictedusingtwosolutionmodelscalculatedapplyingprincipalofHamiltonbyconsideringthedisplacementcontinuityconditionsbetweenthelayers.Forobtainingthedisplacementandcontactforcehistories,thedifferentialquadraturemethod(DQM)isutilised.Inthisinvestigation,theeffectsoflayerlaminanumber,conesemivertexangle,boundaryconditionsandimpactvelocityontheimpactresponsearestudied.

简介：这篇论文处理我击碎的模式在用精细的数字moiré技术的飞机压力状况下面的一张击碎的橡胶表的问题。通过四步自动化穗分析的转移阶段的方法，在笛卡儿的坐标系统的排水量地被给。由并列变换的方程，在极的坐标系统的光线、圆形的排水量分布被获得。裂缝尖端附近的排水量isoline分布和排水量向量分布被讨论。裂缝尖端附近的紧张isoline分布也在这篇论文被分析。最后，分发近为机械地裁定裂缝尖端与部门部门方法被讨论。

简介：Inthiswork,dynamiccompositeanalysistruncatedsandwichconicalshells(STCS)withdifferentboundaryconditionsunderlowvelocityimpactwasinvestigatedanalytically,accordinghigherordersandwichpaneltheory.ImpactoccurredatthetopfacesheetandthecontactforcehistoryispredictedusingtwosolutionmodelscalculatedapplyingprincipalofHamiltonbyconsideringthedisplacementcontinuityconditionsbetweenthelayers.Forobtainingthedisplacementandcontactforcehistories,thedifferentialquadraturemethod(DQM)isutilised.Inthisinvestigation,theeffectsoflayerlaminanumber,conesemivertexangle,boundaryconditionsandimpactvelocityontheimpactresponsearestudied.

简介：TheDonnelltheoryofshellwasappliedtodescribeshellmotion.Theinnerandoutershellswerestiffenedbytransversecomponents.Usingdeformationharmoniousconditionsoftheinterface,theeffectsofstiffenersweretreatedasreverseforcesandmomentsonthedoublecylindricalshell.Intheacousticfieldproducedbyvibrationandsoundradiationofthedoubleshell,thestructuredynamicequation,Helmholtzequationinthefluidfieldandthecontinuityconditionsofthesurfaceoffluid-structurecomposethevibrationequationcoupledbythesound-fluid-structure.Theextractofacousticpressurecomesdowntotheextractofcouplingvibrationequation.Thenearfieldacousticpressurecanbesolveddirectlybycomplicatedcalculationalmethods.

简介：

简介：Thesingle-layerlatticedcylindricalshellisoneofthemostwidelyadoptedspace-framedstructures.Inthispaper,freevibrationpropertiesanddynamicresponsetohorizontalandverticalseismicwavesofsingle-layerlatticedcylindricalshellsareanalyzedbythefiniteclementmethodusingANSYSsoftware.Inthenumericalstudy,wherehundredsofcaseswereanalyzed,theparametersconsideredincludedrise-spanratio,length-spanratio,surfaceloadandmembersectionsize.Moreover,tobetterdefinetheactualbehaviorofsingle-layerlatticedshells,thestudyisfocusedonthedynamicstressresponsetobothaxialforcesandbendingmoments.Basedonthenumericalresults,theeffectsoftheparametersconsideredonthestressesarediscussedandamodifiedseismicforcecoefficientmethodissuggested.Inaddition,someadvicebasedontheserescarchresultsispresentedtohelpinthefuturedesignofsuchstructures.

简介：Agroupoftheoreticalmodelshasbeendevelopedforanalyzingtransientdynamicre-sponsetofilledmetalliccylindricalshellsimpactedbyflat-nosedmissilesatnormalobliquityontheba-sisoftheanalogymodelingmethodofbeam-onfoundation.Itcanbeusedforsolvingtheglobaldefor-mationandthelocalfailureofcylindricalshellsintheimpactprocess.Theballisticlimitspeedandim-pactresponsehistoryhavebeencalculatedbythisgroupoftheoreticalmodels,andtheinnerpressureeffectontheballisticlimitspeedandsomeparametersarediscussedatlength.Thequantitativerela-tionshipbetweeninternalpressureandtheballisticlimitspeedandsomesignificantconclusionshavebeenobtained,whicharebasicallyidenticalwithpreviousexperimentalresults.