Tài liệu Edu cat en fmd fx v5r19 toprint

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FEM Solid CATIA V5 Training Student Notes: Exercises Copyright DASSAULT SYSTEMES FEM Solid Copyright DASSAULT SYSTEMES Version 5 Release 19 January 2009 EDU_CAT_EN_FMD_FX_V5R19 1 FEM Solid Student Notes: Table of Contents Recap Exercise : OCTREE Tetrahedron Mesher OCTREE Tetrahedron Mesher Recap Exercise : Sweep 3D Solid Meshing Using Sweep 3D Recap Exercise : Mesh Part Transformations Mesh Part Transformation Recap Exercise : Mesh Part Extrusion Mesh Part Extrusion Master Exercise 4 10 11 13 14 18 19 24 25 28 35 Copyright DASSAULT SYSTEMES Meshing of an Engine Cylinder Block Presentation Meshing of an Engine Cylinder Block : Step1 Meshing of an Engine Cylinder Block : Step2 3 Copyright DASSAULT SYSTEMES 2 FEM Solid OCTREE Tetrahedron Mesher Student Notes: Recap Exercise 15 min Copyright DASSAULT SYSTEMES In this step you will : Create a solid mesh using OCTREE Tetrahedron Mesher Apply global and local specifications Copyright DASSAULT SYSTEMES 3 FEM Solid Do It Yourself (1/6) Student Notes: Load : FMD_Piston.CATAnalysis Copyright DASSAULT SYSTEMES Use OCTREE Solid Meshing Click on the OCTREE Tetrahedron Mesher icon Select the Part Body Add Global parameters Size : 9mm Absolute sag : 0.9 mm Element type : parabolic Copyright DASSAULT SYSTEMES 4 FEM Solid Do It Yourself (2/6) Student Notes: Add OCTREE Solid Meshing – Local specifications Select “Local size” and click on “Add” Select a face on the side of the part Enter 2mm for value Click OK Copyright DASSAULT SYSTEMES Select « Local sag » and « Add » Select a face on the side of the part Enter 0.5mm for value Click OK Copyright DASSAULT SYSTEMES 5 FEM Solid Do It Yourself (3/6) Student Notes: Select “Edges distribution” and click “Add” Select an edge shown on the part Enter 36 for number of edges Click OK Copyright DASSAULT SYSTEMES Select « Imposed points » and click « Add » Select the “Point.4” point Click OK Copyright DASSAULT SYSTEMES 6 FEM Solid Do It Yourself (4/6) Student Notes: Copyright DASSAULT SYSTEMES Specify OCTREE Solid Meshing – Quality parameters Select the “Stretch” criteria Select Jacobian = 0.3 Warp value = 60 Copyright DASSAULT SYSTEMES 7 FEM Solid Student Notes: Do It Yourself (5/6) Specify OCTREE Solid Meshing – Other parameters Geometry size limit = 0.1 mm Check Mesh edges suppression with value = 0.2 Uncheck Global interior size Min. size for sag specs = 1.252 mm Max. number of attempts = 3 Click « Apply » Once Mesh is visible click « OK » Without Mesh edges suppression: Copyright DASSAULT SYSTEMES With Mesh edges suppression: Copyright DASSAULT SYSTEMES 8 FEM Solid Do It Yourself (6/6) Student Notes: Copyright DASSAULT SYSTEMES Mesh is generated . The Specifications are shown in the tree and on the mesh. Copyright DASSAULT SYSTEMES 9 FEM Solid Solid Meshing Using Sweep 3D Student Notes: Recap Exercise 5 min Copyright DASSAULT SYSTEMES In this step you will : Use the sweep 3D Mesher Copyright DASSAULT SYSTEMES 10 FEM Solid Do It Yourself (1/2) Student Notes: Load: FMD_sweep3d_MeshedSurface.CATAnalysis Sweep 3D Solid Meshing Click on the sweep 3D icon Select the Part Body Select Top and Bottom faces in ‘Sweep Limits’ text fields Select Angle = 60 in Angle field Copyright DASSAULT SYSTEMES Click ‘Compute’ button to compute guides Copyright DASSAULT SYSTEMES Guides are highlighted with yellow color 11 FEM Solid Do It Yourself (2/2) Student Notes: Copyright DASSAULT SYSTEMES Switch to Mesh Tab Select the Element Type as Linear Select ‘Distribution Type’ as ‘Uniform’ Enter Layer Numbers = 20 Click ‘Apply’ Button for preview Click ‘OK’ to confirm Hide the geometry to show only mesh Copyright DASSAULT SYSTEMES 12 FEM Solid Mesh Part Transformation Student Notes: Recap Exercise 15 min Copyright DASSAULT SYSTEMES In this step you will : Create a solid mesh from a surface mesh using Tetrahedron Filler Apply transformation tools to created solid mesh Copyright DASSAULT SYSTEMES 13 FEM Solid Student Notes: Mesh Parts Transformation Copyright DASSAULT SYSTEMES Gear tooth solid geometry and extracted surfaces Copyright DASSAULT SYSTEMES Final mesh 14 FEM Solid Do It Yourself (1/3) Student Notes: Load: FMD_Engrenage.CATAnalysis Solid Meshing Initial surface meshes are already generated. The three surface meshes are closed in term of connectivity and there is no interference Click on the Tetrahedron Filler icon Select the three surface Mesh Parts Click on Apply Button and then click OK Copyright DASSAULT SYSTEMES Deactivate surface meshes Select the three surface mesh parts in the tree By right click on them choose Deactivate Copyright DASSAULT SYSTEMES 15 FEM Solid Do It Yourself (2/3) Student Notes: Use Rotation transformation. Select « Rotation Mesher » icon Select the tetrahedron filler mesh as mesh part Select the « Line.1 » feature for the axis. Put the geometry in « show » mode if the axis is hidden Define rotation angle through a formula In Angle field, display the contextual menu Choose Edit formula: this angle equals rotation Mesh.1 angle: `Nodes and Elements\Rotation Mesh.1\Angle` Copyright DASSAULT SYSTEMES Connection between meshes: nodes condensation Select « Condensation with all meshes » Define numbers of copies In Number of copies field, display the contextual menu Choose Edit formula: 360deg/rotation Mesh.1 angle Click Apply Button Copyright DASSAULT SYSTEMES 16 FEM Solid Do It Yourself (3/3) Student Notes: Click OK to generate the whole Gear Copyright DASSAULT SYSTEMES Deactivate tetrahedron filler mesh Copyright DASSAULT SYSTEMES 17 FEM Solid Mesh Part Extrusion Student Notes: Recap Exercise 15 min Copyright DASSAULT SYSTEMES In this step you will create : Solid mesh using Extrusion by Translation Analyze Element Quality Solid mesh using Extrusion by Rotation Solid mesh using Extrusion by Symmetry Solid mesh using Extrusion along a Spline Copyright DASSAULT SYSTEMES 18 FEM Solid Do It Yourself (1/5) Student Notes: Load: FMD_Extrusion.CATAnalysis Copyright DASSAULT SYSTEMES Extrusion Tools – Extrusion by Translation Click on the Extrude Mesher with Translation icon Select the Advanced Surface Mesh.1 as mesh part input Select the axis as shown Enter Start = 0 mm and End = 200 mm for the length, Geometric as distribution type Enter 10 as layers number and 3 as size ratio Click Apply and then Click on OK Copyright DASSAULT SYSTEMES 19 FEM Solid Do It Yourself (2/5) Student Notes: Copyright DASSAULT SYSTEMES Analyse Elements Quality Click on the Quality Analysis icon Check Nodes Jacobian, Gauss Jacobian, Distortion criteria Focus on Worst Elements if needed Copyright DASSAULT SYSTEMES 20
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