Mô tả:
FEM Solid
CATIA V5 Training
Student Notes:
Exercises
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FEM Solid
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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
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Meshing of an Engine Cylinder Block Presentation
Meshing of an Engine Cylinder Block : Step1
Meshing of an Engine Cylinder Block : Step2
3
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2
FEM Solid
OCTREE Tetrahedron Mesher
Student Notes:
Recap Exercise
15 min
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In this step you will :
Create a solid mesh using OCTREE
Tetrahedron Mesher
Apply global and local
specifications
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3
FEM Solid
Do It Yourself (1/6)
Student Notes:
Load : FMD_Piston.CATAnalysis
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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
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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
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Select « Local sag » and « Add »
Select a face on the side of the part
Enter 0.5mm for value
Click OK
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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
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Select « Imposed points » and click « Add »
Select the “Point.4” point
Click OK
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6
FEM Solid
Do It Yourself (4/6)
Student Notes:
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Specify OCTREE Solid Meshing – Quality
parameters
Select the “Stretch” criteria
Select Jacobian = 0.3
Warp value = 60
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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:
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With Mesh edges suppression:
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8
FEM Solid
Do It Yourself (6/6)
Student Notes:
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Mesh is generated . The Specifications are shown in the tree and on the mesh.
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9
FEM Solid
Solid Meshing Using Sweep 3D
Student Notes:
Recap Exercise
5 min
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In this step you will :
Use the sweep 3D Mesher
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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
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Click ‘Compute’ button to compute guides
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Guides are
highlighted with
yellow color
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FEM Solid
Do It Yourself (2/2)
Student Notes:
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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
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12
FEM Solid
Mesh Part Transformation
Student Notes:
Recap Exercise
15 min
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In this step you will :
Create a solid mesh from a surface
mesh using Tetrahedron Filler
Apply transformation tools to
created solid mesh
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13
FEM Solid
Student Notes:
Mesh Parts Transformation
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Gear tooth solid geometry and extracted
surfaces
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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
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Deactivate surface meshes
Select the three surface mesh parts
in the tree
By right click on them choose
Deactivate
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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`
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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
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FEM Solid
Do It Yourself (3/3)
Student Notes:
Click OK to generate the whole Gear
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Deactivate tetrahedron filler mesh
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17
FEM Solid
Mesh Part Extrusion
Student Notes:
Recap Exercise
15 min
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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
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FEM Solid
Do It Yourself (1/5)
Student Notes:
Load: FMD_Extrusion.CATAnalysis
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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
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19
FEM Solid
Do It Yourself (2/5)
Student Notes:
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Analyse Elements Quality
Click on the Quality Analysis icon
Check Nodes Jacobian, Gauss Jacobian,
Distortion criteria
Focus on Worst Elements if needed
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