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1、有限元分析案例有限元分析案例图1钢铸件及其砂模的横截面尺寸砂模的热物理性能如下表所示:铸钢的热物理性能如下表所示:一、初始条件:铸钢的温度为2875oF，砂模的温度为80oF；砂模外边界的对流边界条件：对流系数0.014Btu/hr.in2.oF，空气温度80oF；求3个小时后铸钢及砂模的温度分布。二、菜单操作:1.UtilityMenuFileChangeTitle,输入CastingSolidification;2.定义单元类型:MainMenuPreprocessorElementTypeAdd/Edit/Delete,Add,Quad4node55；3.定义砂模热性能:MainMenu
2、PreprocessorMaterialPropsIsotropic,默认材料编号1,在Density(DENS)框中输入0.054,在Thermalconductivity(KXX)框中输入0.025,在Specificheat(C)框中输入0.28;4.定义铸钢热性能温度表:MainMenuPreprocessorMaterialProps-TempDependent-TempTable,输入T1=0,T2=2643,T3=2750,T4=2875;5.定义铸钢热性能:MainMenuPreprocessorMaterialProps-TempDependent-PropTable,选择T
3、hConductivity,选择KXX,输入材料编号2,输入C1=1.44,C2=1.54,C3=1.22,C4=1.22,选择Apply,选择Enthalpy,输入C1=0,C2=128.1,C3=163.8,C4=174.2;6.创立关键点:MainMenuPreprocessor-Modeling-CreateKeypointsInActiveCS,输入关键点编号1,输入坐标0,0,0,输入关键点编号2,输入坐标22,0,0,输入关键点编号3,输入坐标10,12,0,输入关键点编号4,输入坐标0,12,0;7.创立几何模型:MainMenuPreprocessor-Modeling-Cr
4、eate-Areas-ArbitraryThroughKPs,顺序选取关键点1,2,3,4;8.MainMenuPreprocessor-Modeling-Create-Areas-RectangleByDimension,输入X1=4,X2=22,Y1=4,Y2=8;9.进行布尔操作:MainMenuPreprocessor-Modeling-Operate-Booleans-OverlapArea,Pickall；10.删除多余面:MainMenuPreprocessor-Modeling-DeleteAreaandBelow,311.保存数据库:在AnsysToolbar中选取SAVE_
5、DB;12.定义单元大小:MainMenuPreprocessor-Meshing-SizeCntrls-Global-Size,在Elementedgelength框中输入1;13.对砂模划分网格:MainMenuPreprocessor-Meshing-Mesh-Areas-Free,选择砂模;14.对铸钢划分网格:MainMenuPreprocessor-Attributes-DefineDefaultAttribs,在Materialnumber菜单中选择2;15.MainMenuPreprocessor-Meshing-Mesh-Areas-Free,选择铸钢;16.定义分析类型:M
6、ainMenuSolution-AnalysisType-NewAnalysis,选择Transient;17.选择铸钢上的节点:UtilityMenuSelectEntities,选择element,mat,输入2,选择Apply,选择node,attachedtoelement,选择OK;18.定义铸钢的初始温度:MainMenuSolution-Loads-ApplyInitialConditnDefine,选择Pickall,选择temp,输入2875,OK;19.选择砂模上的节点:UtilityMenuSelectEntities,Nodes,inverse20.定义砂模的初始温度:
7、MainMenuSolution-Loads-ApplyInitialConditnDefine,选择Pickall,选择temp,输入80,OK;21.UtilityMenuSelectEverything；22.UtilityMenuPlotLines；23.定义对流边界条件:MainMenuSolution-Loads-Apply-Thermal-ConverctionOnLines,选择砂模的三个边界1,3,4,在filecoefficent框中输入80,在Bulktemperature框中输入,80;24.设定瞬态分析时间选项:MainMenuSolutionLoadStepOpts
8、Time/FrequencTime-TimeStep,Timeatendofloadstep3TimeStepsize0.01Steppedorrampedb.c.SteppedAutomatictimesteppingonMinimuntimeStepsize0.001Maximumtimestepsize0.2525.设置输出:MainMenuSolutionLoadStepOptsOutputCtrlsDB/ResultsFile,在Filewritefrequency框中选择Everysubstep;26.求解:MainMenuSolution-Solve-CurrentLS；27.进
9、入后处理:MainMenuTimehistPostproc；28.定义铸钢中心节点的温度变量:MainMenuTimehistPostprocDefineVariables,Add,NodalDOFresult,2,204；29.绘制节点温度随时间变化曲线：MainMenuTimehistPostprocGraphVariable,2。三、热应力分析有齿的轴对称管的热应力分析问题描绘:管受内压，顶上的线在Y=1.代表对称面，我们将对线上的所以节点耦合UY自由度1.进入ANSYS工作目录，取工作文件名为“pipe-th-str2.Resume前面定义的轴对称模型:UtilityMenuResum
10、efrom3.设置菜单过滤为Structural:MainMenuPreferences选则“Structural并且不选择“Thermal,单击OK4.改变title:UtilityMenuFileChangeTitle./TITLE=“2DAXI-SYMMTHERMAL-STRESSANALYSISW/INT.PRESS-ESIZE=0.125OK5.删除实体模型上的对流载荷:MainMenuPreprocessorLoads-Loads-DeleteAllLoadDataAllSolidModLdsOK6.将热单元改变为相应的构造单元:MainMenuPreprocessorElemen
11、tTypeSwitchElemType选择“ThermaltoStruc,单击OK?查看警告信息并单击Close7.设置单元形态为轴对称axisymmetric:MainMenuPreprocessorElementTypeAdd/Edit/DeleteOptions.设置K3=Axisymmetric,单击OKClose8.从热分析中施加温度载荷:MainMenuPreprocessorLoads-Loads-ApplyTemperatureFromThermAnaly.?选择结果文件单击OK?查看警告信息单击Close9.给Y0的线施加对称边界条件MainMenuPreprocessorL
12、oads-Loads-ApplyDisplacementSymmetryB.C.-OnLines+选择线1和9,单击OK10.耦合Y=1节点的UY自由度:10a.选择Y=1处的节点:UtilityMenuSelectEntities.?选择“Nodes及“ByLocation选择“Ycoordinates设置Min,Maxto1,单击OK10.对选择的节点集定义UY自由度耦合:MainMenuPreprocessorCoupling/CeqnCoupleDOFs+?PickAll?NSET=1?设置Lab=UY,单击OKUtilityMenuSelectEverything11.给线施加内部常
13、压力:MainMenuLoads-Loads-ApplyPressureOnLines+?选择线4,单击OK?VALUE=1000,单击OK12.通过显示体载荷检验温度载荷:UtilityMenuPlotCtrlsSymbols?设置BodyLoadSymbols=“Structuraltemps,单击OKUtilityMenuPlotElements13.存储数据库并获得结果:拾取“SAVE_DB(或选择:UtilityMenuFileSaveasJobname.db)MainMenuSolution-Solve-CurrentLS?查看“/STATUS命令窗口并关闭?OK?Close-求解
14、结束之后关闭黄色的提示窗口14.进入后处理查看结果:MainMenuGeneralPostproc15.画位移：MainMenuGeneralPostprocPlotResults-ContourPlot-NodalSolu.?拾取“DOFsolution及“TranslationUSUM,选择“Def+undefedge,单击OK16.沿Y轴旋转90度并沿x-z平面映射轴对称应力结果:UtilityMenuPlotCtrlsStyleSymmetryExpansion2DAxi-Symmetric.拾取“1/4expansionandsetreflectionto“yes,单击OKUtilityMenuPlotCtrlsPan,Zoom,RotateISO16.存盘并离开ANSYS: