汽车结构有限元分析第四讲有限元程序应用介绍课件

第四讲有限元程序应用介绍------ANSYS程序介绍与

2010年2月1.有限元软件前处理

前处理建模菜单：PreprocessorElementTypeAdd/Edit/Delete

Structural(Mass,Link,Beam,Pipe,Solid,Shell)Constraint(MPC)ContactCombination(Spring-damper,Combination,Revolute)SuperelementRealConstantsMaterialPropertiesMaterialLibraryMaterialModels:Structural:

Linear:ElasticNonlinear:Elastic,Inelastic,RateIndependent,RateDependentDensityDampingFrictionCoefficientSections

SectionLibrary,Beam,Shell,Joints前处理建模菜单：Preprocessor---ModelingCreate:KeypointsLines(Lines,Arcs,Splines,LineFillet)Areas(Arbitrary,Rectangle,Circle,Polygon,AreaFillet)Volumes(Arbitrary,Block,Cylinder,Prism,Sphere,Cone)Nodes(Write/ReadNodeFile)Elements(Write/ReadNodeFile,Superelements)Operate:Extrude(Keypoints,Lines,Areas)Booleans(Intersect,Add,Subtract,Divide,Glue,Overlap)Scale(Keypoints,Lines,Areas,Volumes,Nodes)CalcGeomItems(Keypoints,Lines,Areas,Volumes)Move/Modify:Keypoints,Lines,Areas,Volumes,Nodes,ElementsRotateNodeCSTransferCoordinateReverseNormalsCopy：Keypoints,Lines(Mesh),Areas(Mesh),Volumes,Nodes,ElementsReflect：Keypoints,Lines,Areas,Volumes,Nodes,ElementsCheckGeom:SelectSmallLines,ShowDegeneracy,KPdistance,NDdistanceDelete:Keypoints,Lines,Areas,Volumes,Nodes,Elements前处理建模菜单：Preprocessor---CheckingControlsModelChecking:Model/FEAChecking

ShapeChecking:LevelofshapecheckingToggleChecks:

AspectRationTestsShear/TwistAngleDeviationTestsParallelSideTestsMaximumAngleTestsJacobianRationTestsWarpTests

NumberingControlsMergeItems：

Nodes,Elements,Keypoints

CompressNumbers:Nodes,Elements,Keypoints,Lines,Areas,VolumesCoupling/ConstraintEquation

CoupleDOFs,CoincidentNodes,ConstraintEquation,RigidRegionLoadsAnalysisType:

Static,Modal,Harmonic,Transient,Spectrum,EigenBuckling,SubstructureDefineLoads:……结构单元类型：

主要有杆单元、梁单元、管单元、平面单元、三维实体单元、壳单元、接触单元、特殊单元（质量单元、弹簧单元、表面单元、多点约束）、显式动力学单元等。在实际使用时要注意查阅单元手册，了解单元属性，正确选用单元。结构分析类型，主要有七个方面：静态分析;模态分析;谐响应分析;瞬态动力学分析;谱分析;屈曲分析;子结构分析;其它还有断裂力学问题、复合材料问题、疲劳分析、显式动力学分析等也属结构分析范围。按照有限元软件前处理功能，建模工作可概括为下述几个方面：

建立几何模型

建立有限元模型与网格划分

施加载荷及边界条件

---SolutionSolutionOptions

EquationSolvers:ProgramchosensolverSparsedirectPre-ConditionCGIterativeFrontaldirectNonliner

NonlinearOption:LinesearchDOFsolutionpredictorEquilibriumIterationsCreepOption---SolutionDefineLoads:SettingsApplyDisplacementForce/MomentTemperatureGravityInitialConditionDelete(Loads)LoadStepOptions:

OutputControlsSolutionPrintout,GrophicalSolutionTracking,PGRfile,IntergrationPoints

Other:Birth&Death,UserRoutines

Read/WriteLoadCaseFileInitialStressSolveCurrentLoadCaseFromLoadCaseFiles3.有限元软件后处理

---GeneralPostprocessorData&ResultsSummaryReadResults:

Firstset,Nextset,ByLoadStep,ByTime/Freq,BySetNumber

PlotResults:DeformedShape,ContourPlot,VectorPlot,PlotPathItem

ListResults:NodalSolution,ElementSolution,IterationSummary

QueryResults:ElementSolution,SubgridSolution

NodalCalculations:TotalForceSum,SummationElementTable:DefineTable,PlotElementTablePathOperations:DefinePath,PlotPathItemLoadCaseCheckElementShapeFatigue:Proper