ABAQUS单元选择.ppt

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1、ElementSelectionCriteriaAppendix1ABAQUS/Standard基础教程内容提要ElementsinABAQUSStructuralElements(ShellsandBeams)vs.ContinuumElementsModelingBendingUsingContinuumElements用实体单元模拟弯曲StressConcentrations应力集中Contact接触IncompressibleMaterials不可压缩材料MeshGeneration网格生成SolidElementSelec

2、tionSummaryABAQUS/Standard基础教程ElementsinABAQUSABAQUS/Standard基础教程ElementsinABAQUSABAQUS单元库中提供广泛的单元类型，适应不同的结构和几何特征ThewiderangeofelementsintheABAQUSelementlibraryprovidesflexibilityinmodelingdifferentgeometriesandstructures.Eachelementcanbecharacterizedbyconsideringthefo

3、llowing:单元特性：Family单元类型Numberofnodes节点数Degreesoffreedom自由度数Formulation公式Integration积分ABAQUS/Standard基础教程单元类型（Family）Afamilyoffiniteelementsisthebroadestcategoryusedtoclassifyelements.同类型单元有很多相同的基本特。Elementsinthesamefamilysharemanybasicfeatures.同种类单元又有很多变化：Therearemanyv

4、ariationswithinafamily.ElementsinABAQUSspecial-purposeelementslikesprings,dashpots,andmassescontinuum(solidelements)shellelementsbeamelementsrigidelementsmembraneelementstrusselementsinfiniteelementsABAQUS/Standard基础教程ElementsinABAQUSNumberofnodes节点数(interpolation)Anel

5、ement’snumberofnodesdetermineshowthenodaldegreesoffreedomwillbeinterpolatedoverthedomainoftheelement.ABAQUSincludeselementswithbothfirst-andsecond-orderinterpolation.插值函数阶数可以为一次或者两次First-orderinterpolationSecond-orderinterpolationABAQUS/Standard基础教程ElementsinABAQUS自由度数

6、目DegreesoffreedomTheprimaryvariablesthatexistatthenodesofanelementarethedegreesoffreedominthefiniteelementanalysis.Examplesofdegreesoffreedomare:Displacements位移Rotations转角Temperature温度Electricalpotential电势ABAQUS/Standard基础教程公式FormulationThemathematicalformulationusedto

7、describethebehaviorofanelementisanotherbroadcategorythatisusedtoclassifyelements.Examplesofdifferentelementformulations:Planestrain平面应变Planestress平面应力Hybridelements杂交单元Incompatible-modeelements非协调元Small-strainshells小应变壳元Finite-strainshells有限应变壳元Thickshells后壳Thinshells薄

8、壳ElementsinABAQUSABAQUS/Standard基础教程积分Integration单元的刚度和质量在单元内的采样点进行数值计算，这些采样点叫做“积分点”Thestiffnessandmassofanelementare