学科分类
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8 个结果
  • 简介:Thenew-typetractionboundaryintegralequationsdevelopedbyHuandwithnohypersingularintegralareappliedtoanalysisof3Dfinitecrackedbodies.Anumericalalgorithmforgeneral3Dproblemsandasemi-analyticaloneforaxisymmetricproblemsarepresented.Someexamplesofthickplatesandcylindricalcolumnsincludingpenny-shapedcrack(s),andrectangularplatesincludinganellipticalcracknormaltothesurfaceareanalyzed.Thecomparisonbetweenpresentresultsandthoseinliteratureshowsthehighaccuracyandeffectivenessofthepresentmethod.

  • 标签: principal integral crack stress INTENSITY factor
  • 简介:Theboundaryelementmethodforthemodalanalysisoffreevibrationfor3-Danisotropicstructuresusingparticularsolutionshasbeendeveloped.Thecompletepolynomialsofordertwoareusedtoconstructtheparticularsolutionsforgeneralanisotropicmaterials.Thenumericalresultsfor3-Dfreevibra-tionanalysisofanisotropiecantileverbeambythemethodpresentedisingoodagreementwiththeresultsus-ingtheRitztechnique.Foranisotropicmaterials,thenumericalresultscalculatedfromtheproposedmethodareingoodagreementwiththeresultsfromMSC.NASTRAN.

  • 标签: BOUNDARY ELEMENT method ANISOTROPIC structure particular
  • 简介:ThisinvestigationpresentstheGreenfunctionsforadecagonalquasicrystallinematerialwithaparabolicboundarysubjecttoalineforceandalinedislocationbymeansofthecomplexvariablemethod.ThesurfaceGreenfunctionsaretreatedasaspecialcase,andtheexplicitexpressionsofdisplacementsandhoopstressattheparabolicboundaryarealsogiven.Finally,thestressesanddisplacementsinducedbyaphononlineforceactingattheoriginofthelowerhalf-spacearepresented.

  • 标签: 十边形准晶体 抛物线 格林函数 保角映射
  • 简介:Themillrollerbeatingismadeupofaninternalring,middlerollsandanexternalring,theanalysisofwhiehisamulti-bodiescontactproblem.Inthispaper,basedonthethree-dimensionalelasticcontactBEMwithoutfriction,andusingthestructuralcharacteristicsofrollerbearings,middlerollsarede-scribedbyelasticplateunitsofdifferentshapes,whichisplacedontheinternalring.Thediscontinuoustractionproblemofthecontactelementcanbedealtwithbythetractionsub-elementmethod.Thereforethecontactproblemcanbechangedfroinoneofmulti-bodiestooneoftwo-bodies.Asanelasticdeformationoftheplateelement,itcanbecalculatedbyanelasticcontactformulaandisregardedananequivalentgaptobeputintothetotalmatrixequality.Theface-to-facecontactconditionofdisplacementandtractionontheelementwillnerveastheconvergencejudgingcondition.Soconvergencesolutioncanbeobtainedbeforeanygeometryinconsistentonthecontactelementmaytakeplace.Therefore,thethree-dimensionaldistributionofloadofthemillrollerbearingcanbeachieved,Ithasbeenprovedthatthecalculatingmodelofthismethodisvisualizedandsimple,haslastconvergencesolutionandhigheraccuracy,makingitaneffectivenumericalmethodofdesigningandanalyzingloadcharacteristicsofthemillrollerbearing.

  • 标签: ROLLER bearing TRACTION sub-element METHOD elastic
  • 简介:为angle-interlockwoven有弹性行为分析一个微机械模型陶器composites在这篇论文被建议。这个模型由在空间,在邻近纱之间洞和纱实际剖面图几何学认为纤维是波动和连续性考虑实际织物结构。基于laminate理论,编织3D角度联锁有弹性性质陶器composites被预言。交叉不同数字几乎有一样有弹性moduli。陶器矩阵厚度在有弹性moduli上有小效果。当波动比率增加纵模量减少和另外幼仔moduli增加时。在理论预言和试验性结果之间好同意在分析编织3Dangle-interlock有弹性性质表明建议模型可行性陶器composites。这篇论文结果验证分析聚酯矩阵composites方法对编织陶器composites合适事实。

  • 标签: 陶瓷复合材料 弹性行为分析 几何参数 交叉断面几何
  • 简介:thehydroxya-patite粒子机械性质上水吸着损坏效果增强了Bis-GMA/TEGDMA共聚物(HA/Bis-GMA/TEGDMA)用3D被预言了有限房间模型。聚合物矩阵上可塑剂效果被看作它幼仔模量一个变化。三个不同房间模型被用来决定在debondingdamage上改变粒子内容,分裂期间力量和潮湿集中影响。压力分发模式被检验了,压力转移模式澄清了。幼仔Bis-GMA/TEGDMA模量和破裂力量合成也有或没有损坏考虑用模型被预言。有thedebonding损坏考虑以前结果在对存在文学好同意是试验性数据。我们建议模型和一条其他途径防护效果被讨论。FCC房间模型也被扩大了预言批评负担为损坏并且undamaged合成题目到3点曲折测试。

  • 标签: 水吸附 牙齿复合材料 界面松懈工艺 有限元法 单元细胞模型
  • 简介:这篇论文介绍各向异性损坏理论应用程序给形成A12024T3铝合金表限制图学习。在限制铝板结构紧张预言,一个有限元素房间模型被构造了。房间模型由二个阶段,铝合金矩阵和金属间化合簇组成。铝合金矩阵材料行为与充分联合elasto塑料损坏被描述组成方程。金属间化合簇被假定有弹性、易碎。由改变拉长比率,在二轴拉长下面的表限制紧张被使用建议necking标准预言了。预言在对试验性调查结果好同意。而且,有限元素房间模型能为理解铝合金显微镜损坏机制提供信息。如果材料损坏效果在形成学习表金属被忽略,限制紧张在评价上可以结果。

  • 标签: 成形极限图 各向异性损伤 有限元法 极限应力