SHELL63单元中文说明.doc

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1、Release10.0DocumentationforANSYSSHELL63ElasticShell弹性壳单元SHELL63ElementDescriptionSHELL63单元描述SHELL63hasbothbendingandmembranecapabilities.Bothin-planeandnormalloadsarepermitted.Theelementhassixdegreesoffreedomateachnode:translationsinthenodalx,y,andzdirectionsandrotationsab

2、outthenodalx,y,andz-axes.Stressstiffeningandlargedeflectioncapabilitiesareincluded.Aconsistenttangentstiffnessmatrixoptionisavailableforuseinlargedeflection(finiterotation)analyses.SeeSHELL63intheANSYS,Inc.TheoryReferenceformoredetailsaboutthiselement.SimilarelementsareSHE

3、LL43andSHELL181(plasticcapability),andSHELL93(midsidenodecapability).TheETCHGcommandconvertsSHELL57andSHELL157elementstoSHELL63.SHELL63既具有弯曲能力又具有膜力，可以承受平面内荷载和法向荷载。本单元每个节点具有6个自由度：沿节点坐标系X、Y、Z方向的平动和沿节点坐标系X、Y、Z轴的转动。应力刚化和大变形能力已经考虑在其中。在大变形分析（有限转动）中可以采用不变的切向刚度矩阵。其详细的特性请参考Section1

4、4.63oftheANSYSTheoryReference。近似的单元有SHELL43，SHELL181(塑性能力)，SHELL93（包含中间节点）ETCHG命令可以将SHELL57和SHELL157单元转换为SHELL63单元。Figure 63.1  SHELL63GeometryFigure 63.1shell63几何描述xIJ=Elementx-axisifESYSisnotsupplied.如果无ESYS则xIJ为单元X轴x=Elementx-axisifESYSissupplied.如果有ESYS则为单元X轴SHELL63Inp

5、utDataSHELL63输入数据Thegeometry,nodelocations,andthecoordinatesystemforthiselementareshowninFigure63.1:"SHELL63Geometry".Theelementisdefinedbyfournodes,fourthicknesses,anelasticfoundationstiffness,andtheorthotropicmaterialproperties.Orthotropicmaterialdirectionscorrespondtoth

6、eelementcoordinatedirections.TheelementcoordinatesystemorientationisasdescribedinCoordinateSystems.Theelementx-axismayberotatedbyanangleTHETA(indegrees).单元SHELL63的几何形状、节点位置及坐标系如图63.1所示，单元定义需要四个节点、四个厚度、一个弹性地基刚度和正交各向异性的材料。正交各向异性的材料参数的方向依据单元坐标系，单元坐标系方向见CoordinateSystems章节。单元的

7、X轴可以转动一个角度THETA（度数）。Thethicknessisassumedtovarysmoothlyovertheareaoftheelement,withthethicknessinputatthefournodes.Iftheelementhasaconstantthickness,onlyTK(I)needbeinput.Ifthethicknessisnotconstant,allfourthicknessesmustbeinput.在单元的面内，其节点厚度为输入的四个厚度，单元的厚度假定为均匀变化。如果单元厚度不变，只需

8、输入TK(I)即可；如果厚度是变化的，则四个节点的厚度均需输入。Theelasticfoundationstiffness(EFS)isdefinedasthepressurer