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ID:40565338
大小:81.15 KB
页数:16页
时间:2019-08-04
《SHELL63单元中文说明》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Release10.0DocumentationforANSYSSHELL63ElasticShell弹性壳单元SHELL63ElementDescriptionSHELL63单元描述SHELL63hasbothbendingandmembranecapabilities.Bothin-planeandnormalloadsarepermitted.Theelementhassixdegreesoffreedomateachnode:translationsinthenodalx,y,andzdirecti
2、onsandrotationsaboutthenodalx,y,andz-axes.Stressstiffeningandlargedeflectioncapabilitiesareincluded.Aconsistenttangentstiffnessmatrixoptionisavailableforuseinlargedeflection(finiterotation)analyses.SeeSHELL63intheANSYS,Inc.TheoryReferenceformoredetailsabou
3、tthiselement.SimilarelementsareSHELL43andSHELL181(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
4、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Section14.63oftheANSYSTheoryReference。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
5、ESYS则xIJ为单元X轴x=Elementx-axisifESYSissupplied.如果有ESYS则为单元X轴SHELL63InputDataSHELL63输入数据Thegeometry,nodelocations,andthecoordinatesystemforthiselementareshowninFigure63.1:"SHELL63Geometry".Theelementisdefinedbyfournodes,fourthicknesses,anelasticfoundationstif
6、fness,andtheorthotropicmaterialproperties.Orthotropicmaterialdirectionscorrespondtotheelementcoordinatedirections.TheelementcoordinatesystemorientationisasdescribedinCoordinateSystems.Theelementx-axismayberotatedbyanangleTHETA(indegrees).单元SHELL63的几何形状、节点位
7、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X轴可以转动一个角度THETA(度数)。Thethicknessisassumedtovarysmoothlyovertheareaoftheelement,withthethicknessinputatthefournodes.Iftheelementhasaconstantthickness,onlyT
8、K(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
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