简介：Akindofcalculatingmethodforhighorderdifferentialsexpandedbythewaveletscal-ingfunctionsandtheintegraloftheirproductusedinGalerkinFEMisproposed,sothatwecanusethewaveletGalerkinFEMtosolveboundary-valuedifferentialequationswithordershigherthantwo.TocombinethismethodwiththeGeneralizedGaussianintegralmethodinwavelettheory,wecanfindthatthismethodhasmanymeritsinsolvingmechanicalproblems,suchasthebendingofplatesandthosewithvariablethickness.Thenumericalresultsshowthatthismethodisaccurate.

简介：Inthispaper,anunderwaterstructureismodeledasacylindricalshellwithinternalbulkheads,andclosedbyatruncatedconicalshell,anditconsistsofmetalsubstrateandsoundabsorbingcoating,whoseFGMcoreisconsidered.Supposetheinnercavityandouterspaceofthestructurearefilledwithairandfluidmediums,themechanicalresponseoftheunderwaterstructureiscalculatedwithGalerkinmethodwhiletheacousticresponseisinvestigatedbymeansoftheHelmholtzintegral.Somenumericalexamplesaregivenandtheeffectofgeometricalsizeandmaterialparametersonmechanicalandacousticresponseisdiscussed.

简介：Thisstudyhighlightsthejointeffectofearlypolymerizationshrinkageandlongtermmoisturediffusiononthebehavioroftherestoration-toothstructure.Theinterphasedebondingbetweenparticleandpolymerresinindentalcompositeistakenintoaccountbyintroducingthedamagevariable.Theidealizedmodelisdesignedandconstructedforrepresentingtherestorationtoothstructure,whichconsistsofenamel,dentin,compositeandinterphase,eachconsideredashomogenousmaterial.Thesimulationiscarriedoutusingthegeneral-purposefiniteelementsoftwarepackage,ABAQUSincorporatedwithausersubroutinefordefinitionofdamagedmaterialbehavior.TheinfluenceofYoung'smoduliofcompositeandinterphaseonstressanddisplacementisdiscussed.Thecompensatingeffectofwatersorptiononthepolymerizationshrinkageisexaminedwithandwithoutinvolvingdamageevolution.Acomparisonismadebetweentheinfluenceofhyper-,equi-andhypo-watersorption.Interfacialfailureinthespecificregionsaswellascuspalmovementhasbeenpredicated.Thedamageevolvingindentalcompositereducestherigidityofcomposite,thusinturnreducingconsequentstressandincreasingconsequentdisplacement.Thedevelopmentofstressesattherestoration-toothinterfacecanhaveadetrimentaleffectonthelongevityofarestoration.

简介：Anumericalmethodforsimulatingnonlinearfluid-rigidstructureinteractionproblemsisdeveloped.Thestructureisassumedtoundergolargerigidbodymotionsandthefluidflowisgovernedbynonlinear,viscousornon-viscous,fieldequationswithnonlinearboundaryconditionsappliedtothefreesurfaceandfluid-solidinteractioninterfaces.AnArbitrary-Lagrangian-Eulerian(ALE)meshsystemisusedtoconstructthenumericalmodel.Amulti-blocknumericalschemeofstudyisadoptedallowingfortherelativemotionbetweenmovingoversetgrids,whichareindependentofoneanother.Thisprovidesaconvenientmethodtoovercomethedifficultiesinmatchingfluidmesheswithlargesolidmotions.Nonlinearnumericalequationsdescribingnonlinearfluid-solidinteractiondynamicsarederivedthroughanumericaldiscretizationschemeofstudy.Acouplingiterationprocessisusedtosolvethesenumericalequations.Numericalexamplesarepresentedtodemonstrateapplicationsofthemodeldeveloped.

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

简介：在艾尔，Au，Ag，Cu和Ni的分裂的边脱臼的扩大核心结构在脱臼的格子理论以内被决定。管理排水量的2D脱臼方程被被概括叠的差错精力的parameterization决定的恢复力量联合。夸耀变化方法被介绍解决脱臼方程，试用答案被二arctan类型功能与二个未经决定的参数组成。部分脱臼的核心宽度比由于水晶的组件的考虑在概括Peierls-Nabarro模型获得了的宽。

简介：合金(SMA)电线增强了的形状存储器的机械行为疼痛有损坏的结构通过变化原则被分析，为中央排水量域的为结构的一个管理方程被导出的、数学表达式，有损坏的典型元素的压力紧张地被介绍，并且为在SMA电线和矩阵之间的接口失败的一个失败标准在死了负担的二种使活动和温度下面被建立，在温度在有效免费恢复被包括的地方，拉紧。另外，在象接口性质那样的失败标准有一些另外的创作因素，SMA的动态性质，起始的debonding长度L-l等等。结果是重要的理解自我改编的控制和SMA电线的失败机制增强了的结构的力量有损坏的聪明的结构。

简介：在这篇论文，适应基因算法(统帅)被用于拓扑学优化与频率领域刺激捆绑结构。优化限制在基础加速刺激下面包括基本频率，在力量刺激下面的排水量回答和加速回答。轮盘赌车轮选择操作员，适应转线路和变化操作员被用作基因操作员。一些启发式的策略被提出指导额外的酒吧和节点的删除在上捆绑结构。三个例子证明建议方法能产出最佳结构形式和最轻的重量撤退结构当时令人满意的动态反应限制。

简介：土壤结构接口的行为在土壤结构相互作用的定义起一个主要作用。在这糊双性人潜力表面为土壤结构接口的elasto塑料的模型被建议以便描述接口变丑行为，包括紧张弄软和正常膨胀性。模型在概括潜在的理论，土壤结构接口问题作为压力地里的一个二维的数学问题在是问候的框架被提出，并且塑料州的方程被用来代替传统的域表面。关系曲线砍应力和正切的紧张被明智的功能由夸张功能和夸张正割功能填写了的一片适合，当关系正常弯时，紧张和正切的紧张被明智的功能由二次的功能和夸张正割功能填写了的另一片适合。建议的途径有的优点导出elastoplastic没有要求的组成的矩阵塑料潜在的功能和收益表面。而且，数学原则是清楚的，并且全部模型参数能被试验性的测试识别。最后，模型的预言与获得从的试验性的结果相比简单砍在正常压力下面的测试，和结果证明模型讲理、实际。

简介：Aninvestigationismadeonthesoilpressureinaninecabinopenedbottomellipticalbarrelstructure.Thecalculationmodelsusingthepenetrationofnegativepressuremethodhavebeendeveloped.Thefirstcalculationmodelisisfortheconstructionstageinvolvingthreezones,namely,passive,transitional,andactiveestablishedforthesoilpressureincabins.Theothercalculationmodelisbasedontheusestage,withthetwo(passiveandactive)zonesforthesoilpressureincabins.Theheightofzonesandthetheoreticalanalyticalsolutionsofinnersoilpressurearederived.Theanalyticalformulasofthemodelsareprovedusingthefiniteelementmethodandexperimentaldata,andtheformulasareanalyzedintheinnersoilpressureinthesamecondition.Thecalculationmodelscanbeusedforothermulti-positionstructuraldesignorconstruction.

简介：在这篇论文，为orthotropic板的飞机裂缝问题的压力紧张因素的评估相等参数用一个分数维的二水平的有限元素方法(F2LFEM)被调查。一个orthotropic裂缝问题的一般答案被与各向同性的裂缝问题吸收这个问题获得，并且在F2LFEM作为全球插值功能被采用。在裂缝板的裂缝尖端的邻居，分数维的几何学概念被介绍完成有类似比率的类似的网孔不到一个并且产生一个无穷小的网孔以便在二邻近的层的僵硬矩阵之间的关系是相等的。在裂缝尖端附近的自由的很多度被转变到概括坐标的一个小集合。数字例子证明这个方法在评估压力紧张因素(SIF)有效、精确。