简介：Onthebasesofhightemperaturecreepexperiments,theresearchonengineeringapplicationofrheologicalformingiscarriedoutontwokindsoflightmetalalloypartsnamedcylindricalshellofLc4aluminumalloyandvanediskwithcomplexcurvedsurfaceofTC11titaniumalloy.Moreover,themechanicalpropertytestsunderroomandhightemperaturesfortheworkpiecesproducedbythisnewtechniquearealsodone,theresultsshowedthattheyaremuchimprovedevidentlycomparedwiththoseproducedbytraditionalmethod.

简介：AnumericalanalysiswascarriedouttostudythemovingboundaryprobleminthephysicalprocessofpulsedNd-YAGlasersurfacemeltingpriortovaporization.Theenthalpymethodwasappliedtosolvethistwo-phaseaxisymmetricalmehingproblem.Computationalresultsoftemperaturefieldswereobtained,whichprovideusefulinformationtopracticallairtreatmentprocessing.Thevalidityofenthalpymethodinsolvingsuchproblemsispresented.

简介：这篇论文处理我击碎的模式在用精细的数字波纹技术的飞机压力状况下面的一张击碎的橡胶表的问题。通过自动化穗分析的四个转移stepphase方法，在Cartesiancoordinate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isolinedistributions和排水量向量分布被讨论。裂缝尖端附近的strainisoline分布也在这篇论文被分析。最后，分发近为机械域裁定裂缝尖端与部门部门方法被讨论。

简介：Thispaperappliesthestochasticfiniteelementmethodtoanalysethestatisticsofstressesinearthdamsandassessthesafetyandreliabilityofthedams.Formulationsofthestochasticfiniteelementmethodarebrieflyreviewedandtheprocedureforassessingdam’sstrengthandstabilityisdescribed.Asanexample,adetailedanalysisforanactualdam-Nululindamisperformed.Apracticalmethodforstudyingbuilt-damsbasedontheprototypeobservationdataisdescribed.

简介：Inthispaperthedualreciprocityboundaryelementmethodisemployedtosolvenonlineardifferentialequation~2u+u+εu~3=b.ResultsobtainedinanexamplehaveagoodagreementwiththosebyFEMandshowtheapplicabilityandsimplicityofdualreciprocitymethod(DRM)insolvingnonlineardif-ferentialequations.

简介：Stress-dependenceoftheintrinsictimeofviscoelasticmaterialsisinvestigated.Theinfluenceofstresslevelontheintrinsictimeisconsideredtobesimilartothatoflemperature,pressure,solventcon-centration,damageandphysicalaging.Thetime-lemperature-stressequivalenceprincipleisproposed,byemployingwhich,thecreepcurvesatdifferenttemperaturesandstresslevelscanbeshiftedintoamastercurveatreferencetemperatureandstresslevel.Thusthelong-termcreepbehaviorofviscoelasticmaterialsatalowertemperatureandstresscanbepredictedfromtheshort-termoneatahighertemperatureandstress.Asanexample,thenonlinearcreepbehaviorofhigh-densitypolyethylene(HDPE)atroomtemperatureisstudiedusingthetime-temperature-stressequivalenceprinciplepresented.

简介：Basedonthethermodynamictheory,anorthotropicdamageconstitutivemodelwasdevelopedtodescribethenonlinearmechanicalbehaviorofC/SiCcomposites.Thediferentnonlinearkinematicandisotropichardeningfunctionswereadoptedtodescribeaccuratelythedamageevolutionprocesses.Thedamagevariablesweredefinedwiththedamagedmodulusandtheinitialundamagedmodulusonenergyequivalenceprinciple.Theinitialorthotropyanddamagecouplingwerepresentedinthedamageyieldfunction.Tensileandin-planeshearloadingandunloadingtestswereperformed,andagoodagreementbetweenthemodelandtheexperimentalresultswasachieved.

简介：Animprovedmodelforultrasonictransducersisproposed.Byconsideringonlythefirstsymmetricmode,eachlayerisrepresentedasanacousticaltransmissionlineinmodelingofbulkwavetransducers.Inimagingapplications,widebandwidthandshorttimedurationarerequired.Theapproachwehaveusedconsistsofimpedancematchingthefrontfaceofthepiezoelectrictransducertothepropagatingmediumwithaquarterwavelengthimpedancematchinglayerandinsertinganunmatchingquarterwavelengthacousticallayerbetweentherearfaceandbackingmaterial.Aheavybackingwoulddegradethewide-bandphenomena,butshowatimedurationshorterthan0.5μsforimagingapplications.PSPICEcodeofthecontrolledsourcemodelisimplementedtopreciselypredicttheperformanceofthematchedtransducerssuchasimpedance,insertionloss,bandwidthanddurationoftheimpulseresponse.Goodagreementbetweenthesimulationandexperimentalresultshasbeenachieved.

简介：Applyingtheparametricderivationmethod,PeierlsenergyandPeierlsstressarecalculatedwithanon-sinusoidalforcelawinthelatticetheory,whiletheresultsobtainedbythepower-seriesexpansionaccordingtosinusoidallawcanbededucedasalimitingcaseofnon-sinusoidallaw.ThesimplifiedexpressionsofPeierlsenergyandPeierlsstressareobtainedforthelimitofwideandnarrow.PeierlsenergyandPeierlsstressdecreasemonotonicallywiththefactorofmodificationofforcelaw.PresentresultscanbeusedexpedientlyforpredictionofthecorrectorderofmagnitudeofPeierlsstressformaterials.

简介：Anapproachbasedoncontinuumdamagemechanicstofatiguelifepredictionforstructuresisproposed.Anewfatiguedamageevolutionequationisdeveloped,inwhichtheparametersareobtainedinasimplewaywithreferencetotheexperimentalresultsoffatiguetestsonstandardspecimens.WiththeutilizationofAPDLlanguageontheANSYSplatform,afiniteelementimplementationispresentedtoperformcouplingoperationondamageevolutionofmaterialandstressredistribution.ThefatiguelivesofsomenotchedspecimensandaPitch-change-linkarepredictedbyusingtheaboveapproach.Thecalculatedresultsarevalidatedwithexperimentaldata.

简介：一个代理人联合为技术和粒子群优化建模的代理人的基于的粒子群优化(SBPSO)算法被用于合成压力容器的基于可靠性的柔韧的设计(RBRD)。SBPSO的算法和效率通过数字例子被显示。为细丝创伤的一个模型有金属性的班机的合成压力容器然后被网分析学习，它的回答被使用有限元素方法分析(由软件ANSYS表现了)。为最大化性能因素的一个优化问题被在圆柱的部分，金属班机的厚度和dropoff区域尺寸选择螺旋状的厚度的弯屈的取向为设计变量提出。为合成的层和金属班机的力量限制被分别地使用Tsai-Wu失败标准和协定失败标准构造。方法建议了的数字例子表演能有效地解决RBRD问题，和建议模型的最佳的结果能满足某些可靠性要求并且有坚韧性到设计变量的变化。

简介：‘Stent对stent’研究是被设计与以前同意的相比显示出新stent图案的优势的一种使随机化的试用。这些研究被规章的机构通常使用，例如美国食物药品管理局(食物及药品管理局)，到表示同意到新stent图案。有这些临床的试用的问题是他们的高费用和困难。在这份报纸，为‘stent对stent’的一种数字选择复杂临床的研究被介绍。一个有限元素模型被开发在冠的stent放置以后在结果上调查stent设计的影响。二商业地可得到的stents(NIR和多连接stents)被建模，他们的行为以压力分发在推广期间被比较，光线的获得，外部直径变化并且节略。而且，狭窄率上的stent设计的效果被在动脉以内比较压力分发调查。在stented动脉的动脉的墙压力的分析显示多连接stent设计原因与slotted试管NIR设计相比与局部性的stenotic损害降低应力到一个动脉粥样硬化患者容器。有观察临床的狭窄的调查结果相互关联与多连接stent设计相比在NIR评估狭窄率，它更高报导了。

简介：在这个工作，在有表面精力的效果的一半空间的边脱臼的有弹性的领域被获得了。有弹性的地然后被用来在脱臼上学习图象力量，为在有紧张失配和底层上的薄电影的让步的力量的取向附生的薄电影的脱臼产生的批评厚度。当从免费表面的脱臼的距离比小时，脱臼上的图象力量从常规答案背离的结果表演若干次典型长度。另外由于表面精力的效果，为脱臼产生的批评厚度比由常规有弹性的答案预言了的小，偏差的程度取决于失配紧张的大小。相反，为许多实际薄电影的让步的力量上的表面精力的效果能除了典型长度比得上厚度的一些软的被忽视。

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