CATIA装配有限元分析training.pptx

COPYRIGHT DASSAULT SYSTEMES 20021Generative Part Structural AnalysisCATIA Training FoilsVersion 5 Release 9June 2002EDU-CAT-E-GPS-FF-V5R9COPYRIGHT DASSAULT SYSTEMES 20022Objectives of the courseIn this course you will learn how to perform Static and Modal Analyses(create analysis documents,compute and visualize)on a single Part.Targeted audienceCATIA V5 UsersPrerequisitesMechanical DesignFundamentals in CATIAV5Generative Part Structural Analysis1.5 daysCOPYRIGHT DASSAULT SYSTEMES 20023Table of Contents(1/2)1.Introduction to GPS Analysisp.51.1.Accessing the Workbench p.61.2.User Interfacep.71.3.User Settingsp.102.Static Analysis Pre-Processingp.142.1.Creating a new Analysis Documentp.162.2.Saving Analysis Documentsp.192.3.Mesh-parts managementp.222.4.Define Restraintsp.262.5.Define Loadsp.302.6.Advanced Pre-Processing Toolsp.362.7.Beam elementsp.403.Results Computation of a Static Analysisp.433.1.Specifying External Storagep.443.2.Computing p.494.Static Results Visualization and Refinementp.534.1.Image Creationp.544.2.Images Layoutp.604.3.Results Managementp.614.4.Other Capabilitiesp.674.5.Historic of Computationp.694.6.Parabolic Element Typep.704.7.Global and Local Mesh Refinementp.714.8.Mesh Adaptativityp.734.9.Knowledgeware for Analysis p.77COPYRIGHT DASSAULT SYSTEMES 20024Table of Contents(2/2)5.Virtual Partp.835.1.The Various Transmission Types Listp.845.2.Examples Showing Various Transmission Typesp.855.3.Example of Rigid Spring Virtual parts usep.865.4.Applying Actions to Virtual Parts p.875.5.Virtual Parts sharing a single handler pointp.896.Dynamic Pre-Processing and Computationp.906.1.Creating Additional Mass Equipmentp.926.2.Unrestrained or Restrained Partp.946.3.Computing the Analysisp.967.Dynamics Results Visualizationp.987.1.Image Creationp.997.2.Results Managementp.1028.Elements tests with ELFINI solverp.1048.1.TE4 and TE10 comparison p.1058.2.Static Analysisp.1068.2.Frequency Analysisp.1078.3.Buckling Analysisp.108Frequently Asked Questionsp.109COPYRIGHT DASSAULT SYSTEMES 20025In this lesson,you will learn about the Generative Part Structural Analysis Workbench by:Accessing The Workbench User Interface User Settings1.Introduction to GPS AnalysisCOPYRIGHT DASSAULT SYSTEMES 200261.1.Accessing the WorkbenchIn this lesson,you will learn about the Generative Part Structural Analysis Workbench.Be sure that the Part being studied has a material applied.This action can only be performed in the Part Design Workbench3-Modal or Static Analysis.A new CATAnalysis document is created.2-Analysis&Simulation1-StartCOPYRIGHT DASSAULT SYSTEMES 200271.2.User Interface-ToolbarsRestraintsExternal Storage ManagementAnalysis reportingLoadsModel ManagerComputeImagesVirtual parts Manager and massCOPYRIGHT DASSAULT SYSTEMES 20028User Interface-IconsImage CreationDeformationStress Von MisesDisplacementRestraints ApplicationClampMechanical RestraintAdvanced RestraintResults VisualizationAnimateCut Plane AnalysisDeformation Scale FactorSearch Image ExtremaInformationsImage LayoutComputationComputeLoads ApplicationPressureForceAccelerationForce DensityEnforced DisplacementTemperature fieldMass EquipmentMassAnalysis ResultsBasic Analysis ReportHistoric Of ComputationsListingSolver ToolsStorage LocationClear StorageTemporary Data DirectoryModel managerTetrahedron,Octree and Beam meshingElement type and local meshSolid propertyShell propertyBeam propertyModel CheckVirtual parts managerVirtual partsPeriodicity conditionsNew!New!New!COPYRIGHT DASSAULT SYSTEMES 20029Analysis TreeAssociated Generative PartPre-Processing InputImages of ResultsUser Interface-Specification TreeMesh parts PropertiesExternal StorageMesh parts SpecificationsCOPYRIGHT DASSAULT SYSTEMES 200210This enables you to faster access the analysis workbench.1.3.User Settings-Shortcut Of Analysis Icon2-Transfer“Generative Structural Analysis”from Available to Favorites1-Select“Customize”from Tools menu3-Access Analysis Workbench through this iconCOPYRIGHT DASSAULT SYSTEMES 200211In Part Design Workbench,customize Render Style by adding material visualization.This will also enable you to view analysis images in average-iso visualization mode.We will activate Materials so that material render styles are displayedUser Settings-Customizing View Modes2-Click on“Apply Customized View”3-Activate“Materials”and click OK.1-Select Render Style from the View menuCOPYRIGHT DASSAULT SYSTEMES 200212This enhances the visualization of selected faces.User Settings-Highlighting Faces and Edges1-Select“Options”from the Tools menu2-Click“Display”3-Click“Navigation”4-Activate“Highlight faces and edges”COPYRIGHT DASSAULT SYSTEMES 200213User Settings-Show/No Show Visualization 1-Select“Options”from the“Tools”menu3-Click“Tree”2-Click“Display”4-Activate Visualization of Show/NoShowCOPYRIGHT DASSAULT SYSTEMES 200214In this lesson,you will learn how to create a new Analysis Document,how to save it and how to define Restraints and Loads on a Part.Create a New Analysis DocumentSave Analysis DocumentsDefine RestraintsDefine LoadsAdvanced Pre-Processing Tools2.Static Analysis Pre-ProcessingCOPYRIGHT DASSAULT SYSTEMES 200215General Process for a Static AnalysisEnsure that part has material defined thenOpen Static Analysis WorkbenchApply Restraints to the modelApply Loads to the modelAnalyze the ResultsRefine the AnalysisPerform ComputationCreate ImagesCOPYRIGHT DASSAULT SYSTEMES 200216A Material must be applied to the studied Part.This can only be peformed in the Part Design Workbench.1-Click on the Material icon2-Select a Material4-Apply2.1.Document Creation-Assigning Materials5-Check3-Select a Part(on the geometry or in the tree)COPYRIGHT DASSAULT SYSTEMES 200217New Analysis Documents,entitled CATAnalysis files,can be created in various ways.There are 3 ways to create a new Analysis Document:Document Creation-Three WaysWorkbench IconFile menuStart menuCOPYRIGHT DASSAULT SYSTEMES 200218Here is how to create a new Analysis Document using the Start menu.Document Creation-Using Start Menu1-Click“Start”2-Click“Generative Structural Analysis”3-Select Static or Frequency AnalysisCOPYRIGHT DASSAULT SYSTEMES 200219There are various ways to save an Analysis Document and its parent documents.It is important to achieve this correctly with an assembly analysis document,for the assembly has to be properly linked with all the parts it is made from.Only those documents that have been modified will be saved or proposed for the saving.2.2.Saving an Analysis DocumentSave will save the active Analysis DocumentSave As.is similar to Save,but it allows you to specify the name and folder for the active Analysis DocumentSave All will propose saving all open documents and children of these documentsCOPYRIGHT DASSAULT SYSTEMES 200220Save Management is an easy way to save all modified documents under user-specified names.All modified open documents will be proposed for saving,regardless of which document is activeDocument Saving-Under Specified Names1-Select“Save Management”2-Specify which documents to be savedCOPYRIGHT DASSAULT SYSTEMES 200221“Send To”is an easy way to save all linked documents in a user specified directory.Available filesFiles that will be savedDocument Saving-“Send To”MechanismUse this option if you want the directory structure of the selected files list to be duplicated.Else the selected files will be copied directly under the target directory.1-Select“Send To”&“Directory”2-Use these arrows to switch selected files between“Can be copied”and“Will be copied”4-Select the target directory3-Click here to modify the selected target name2-Use theses arrows to switch all the files between“Can be copied”and“Will be copied”COPYRIGHT DASSAULT SYSTEMES 2002222.3.Mesh-parts management Mesh creation&destructionNew R9To create or modify mesh-parts,click on the appropriate mesh-part toolbar iconOctree tetrahedron mesh for solid geometry1.Select the mesh part in the tree.2.Contextual menu,and Delete.Octree triangle mesh for surface meshBeam meshing for wire-frame geometryWe can also delete a mesh part created from an automatic mesher or FMS1.Select the geometry to mesh.2.Select the corresponding mesh type.3.Enter mesh specificationsCOPYRIGHT DASSAULT SYSTEMES 200223Mesh-parts management Properties managementNew R91.Select the appropriate property type.2.Select the part geometry entity(PartBody or OpenBody)in the tree.3.Enter property specifications as the case may be.A mesh part must have only one single property.As for mesh parts,we can also delete properties.Once the mesh part is created,we have to define its propertyCOPYRIGHT DASSAULT SYSTEMES 200224Mesh-parts management Model Check commandNew R9The Model Check command can help the user understanding the Design-Analysis links.qThanks to the list of all the mesh parts and properties.qHighlights the corresponding features.Just before compute,we can check the consistency of the FEM model:qMissing properties.qMissing material.qMissing support.qDiagnostic problems.After modificationsDiagnostic:Check for Property and Material missing and redundance.COPYRIGHT DASSAULT SYSTEMES 200225Mesh-parts management Analyze of parts made of several bodiesNew R9We can analyze parts which have several GSD bodiesqEach body has its own material.qSeveral mesh parts will be created(one for each body).qThen,we can apply different thicknesses for each mesh part.Several bodiesSeveral mesh partsCOPYRIGHT DASSAULT SYSTEMES 200226Clamps are restraints applied to surface or curve geometries,on which all nodes are to be blocked in the subsequent analysis.2.4.Define Restraints-Clamps1-Click on the“Clamp”Icon in the“Restrain”Toolbar2-Select the geometry support(s)(Surfaces or Edges).3-Click“OK”Symbols associated to a null translation in all directions of the selected geometry are displayed.A Clamp object appears in the Specification Tree under the active Restraints objects set.Any selectable geometry is highlighted when you drag the cursor over it.COPYRIGHT DASSAULT SYSTEMES 200227Surface slider(3Tr.&1Rot.),Slider(1Tr.),Sliding pivot(1Tr.&1Rot.),Ball joint(3Rot.)and Pivot(1Rot.).Surface slider can be directly applied on surfaces whereas other Restraints must be applied on a virtual part(See 5.4.)1-Click on Surface Slider IconSymbols on GeometryFeatures TreeDefine Restraints-Mechanical Restraints2-Select the Geometry Support(s)(Surfaces)3-Click“OK”COPYRIGHT DASSAULT SYSTEMES 200228Advanced Restraints are generic restraints allowing you to fix any combination of available nodal degrees of freedom(dof)on arbitrary geometries.2-Select axis typeDefine Restraints-Advanced Restraints1-Select the support(s)(Surfaces or Edges)3-Activate degrees to be fixedThe rotation degrees are relevant only for structural element meshes(i.e.shell elements),or Virtual Parts.COPYRIGHT DASSAULT SYSTEMES 200229Iso-static Restraints are Statically Definite Restraints allowing you to simply support a Body.Define Restraints-Iso-static Restraints1-Click on the“iso-static restraints”Icon2-Select a geometry3-Click OKCOPYRIGHT DASSAULT SYSTEMES 200230Pressures are intensive loads representing uniform scalar pressure fields applied to surface geometries,hence the force direction is everywhere normal to the surface.1-Click on the“Pressure”IconSymbols representing the Pressure Loads are displayed.A Loads object appears in the Features Tree under the active Loads objects set.2.5.Define Loads-Pressure Loads2-Select the geometry support(s)(Surfaces).Any selectable geometry is highlighted when you drag the cursor over it.4-Click“OK”3-Specify a pressure value or Open a Data File for mappingCOPYRIGHT DASSAULT SYSTEMES 200231Distributed Forces(Moments)are force systems statically equivalent to a given pure force(couple)resultant at a given point,distributed on a virtual part or on a geometric selection.Define Loads-Distributed Forces and Moments1-Select support(s)(Surfaces or Edges)2-Select axis type3-Specify forceCOPYRIGHT DASSAULT SYSTEMES 200232Accelerations are intensive loads representing mass body force(acceleration)fields of uniform magnitude applied to parts.Define Loads-Acceleration(Gravity Body Forces)1-Select support(s)(Surfaces or Edges)2-Select axis type3-Specify vectorCOPYRIGHT DASSAULT SYSTEMES 200233Rotation Forces are intensive loads representing mass body force(acceleration)fields induced by rotational motion applied to parts.Define Loads-Rotation Forces1-Select support(s)(Surfaces or Edges)2-Select axis3-Specify anglevelocity and acceleration(if necessary)COPYRIGHT DASSAULT SYSTEMES 200234Force Densities are intensive loads representing line(surface)traction fields or volume body force fields,of uniform magnitude,applied to either curve(surface)geometries,or to parts.Define Loads-Force Densities1-Select support(s)2-Select axis type3-Specify vectorOrOpen a data file for mapping an external loadCOPYRIGHT DASSAULT SYSTEMES 200235Enforced Displacements are equivalent loads applied to support geometries,resulting for the subsequent analysis in assigning non-zero values to displacements in previously restrained directions.An Enforced Displacement object is by definition associated to a Restraint object.Define Loads-Enforced Displacements1-Select restraint2-Enter values for each restrained dofCOPYRIGHT DASSAULT SYSTEMES 200236Instead of specifying each component of the force vector,you can simply define the force direction by using the compass.This will ensure that the force is defined relatively to the part,whatever its positioning.2.6.Advanced Pre-Processing Tools-Force with Compass1-Click on the loads icon2-Select support and specify force vector norm3-Drag the compass by handling the red square and drop it on the appropriate surface4-Use Compass to define vector directionCOPYRIGHT DASSAULT SYSTEMES 200237Instead of using the global axis system,you can use an implicit one if you want your pre-processing to be defined with respect to the part.You can also specify a user defined axis system if you have created one in Part Design.In that case,the dof directions of an advanced restraint,or the components of a force,will be processed with respect to the the specified Axis system.Their interpretation will further depend on your Axis Type choice.The restrain rotations are available only with surfacic geometry.Advanced Pre-Processing Tools-Axis Systems1-Select a user defined axis system type3-Select axis system local orientation4-Fix dofs(in Advanced Restraint case)NB:Rotations are available with shells,but not with solids.2-Select an existing axis system in the features treeCOPYRIGHT DASSAULT SYSTEMES 200238New!Advanced Pre-Processing Tools Pre-processing on pointsWe can apply pre-processing specifications on points and vertexWe can apply it for Loads,restraints or Masses.It is available on different types of support:VertexPoints followed by FMSPoints followed by Octree mesher1.Create a GSD point2.Mesh the part with the constrained point3.Apply distributed forceCOPYRIGHT DASSAULT SYSTEMES 200239Advanced Pre-Processing Tools Mass setsMass