Week 3 - 2D meshing for sheet metal
Aim:
To create the mid surface for all the components after checking the geometrical errors and mesh the mid surface with the given element quality criteria.
Objectives:
- Analyse for geometrical errors.
- Review for TOPO.
- Select the face for Mid Surface.
- Fix the Quaity Criteria.
- Apply Mesh for the given hood model.
- Check the Quality of Mesh.
Procedure:
Step 1: Open Ansa software
Step 2: Import the model file from the path.
Command - File>Open Recent> Hood Model.STP
Step 3: Check for geometry error
Command - Checks> Geometry
Step 4: Fix the Geometry errors
Step 5: Check the Thickness.
Command - utilities> measure
Step 6: Thickness of the sheet is knowing then we need to create the mid surface.
Command - Faces>Offset or Faces>Midsurface
Step 7: Create the pid for the mid surface generated for the face.
Command - Faces > Set PID
Step 8: Check for the geometry error for the mid surface generated, TOPO if required.
Step 9: Go to Mesh mode
Step 10: Assign the equal valve for perimeters
Command - Perimeters> Length
Step 11: Assign the valve mesh parameters
Step 12: Fix the given valves to the Quality Criteria
Command - F11
|
S.No |
Quality Criteria |
Value |
|
1 |
Target/Average length |
5 |
|
2 |
Minimum Length |
2 |
|
3 |
Maximum Length |
7 |
|
4 |
Aspect |
3 |
|
5 |
Warpage |
15 |
|
6 |
Skewness |
45 |
|
7 |
Jacobian |
0.7 |
|
8 |
Minimum Quad Angle |
45 |
|
9 |
Maximum Quad Angle |
135 |
|
10 |
Minimum Tria Angle |
30 |
|
11 |
Maximum Tria Angle |
120 |
|
12 |
Tria Percentage |
15 |
Step 13: Apply Mesh to the required faces
Command - Mesh generation >Best>Select
Step 14: Check for the quality fails
Step 15: Retify the mesh quality issue.
Step 16: Following commands are used to rectify mesh quality issue
Command - Shell Mesh> Reconstruction
Command - Shell mesh > Smooth
Command - Elements > Split
Command - Elements > Swap
Step 17: Check OFF elements after giving quality criteria must be zero.
Learning outcomes:
- Multi ways for creating the midsurface.
- Fixing of cracks in the model.
- Eliminating the needle face from the model.
- Quality criteria aspects
- Purpose of using specific tools for individual operations
Conclusion:
For the given Hood model the mid surface for all the components after checking the geometrical errors and mesh the mid surface with the given element quality criteria is been created.
Mid surface and Mesh
1.Hinge 1
2. Hinge 2
3. Lach
4. Internal Hood
5. External Panel
