2D meshing for Plastic components
Week - 4 - 2D meshing for Plastic components
AIM:
For the given Plastic Bottle Cap model, check for the geometrical errors and take the mid surface by suitable mid surfacing techniques. PID and Thickness assignment has to be done for all the mid surfaces. Mesh the same with given element Quality criteria. (Refer the table Below for the Quality criteria)
QUALITY REQUIREMENT:
|
S.No |
Quality Criteria |
Value |
|
1 |
Target/Average length |
1 |
|
2 |
Minimum Length |
0.5 |
|
3 |
Maximum Length |
3 |
|
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 |
|
10 |
Tria Percentage |
15 |
PROCEDURE:
• The given file should be imported into ANSA. File->Open->File Location
• The respective geometry is cleaned till no errors are encountered.
• The orientation of the geometry is set to one sided being positive (grey) and one being negative (yellow).
• The thickness of each 3D zone is taken and a mid-surface is generated.
• For faces interfering, the Intersect option, Topo->Faces->Intersect is used to rectify.
• The mid-surface for multiple similar parts like, fins, teeth were done by using the Rotate option available as: Transform->Copy->Rotate. Here the angular diffeence is specified and the Centre of Gravity points are mentioned as Axis of Rotation.
• After Mid-surface generation, the Mesh Parameters and Quality Criteria is input.
• Each component's mid surface is input as a new PID and the respective thickness is assigned.
• The meshing of each component mid-surface is done with rectification of each quality criteria encountered.
• The draw shell as solid option is used in: Quality Critera->Presentation Parameters->Draw Shell as Solid
CONCLUSION:
• The Geomerty cleanup and Mid-surface generation was done successfully.
• While meshing few intricate regions created problems, which did not satisfy the quality specified. To rectify this the geometry featured had to altered. Therefore, the regions are left with suitable mesh smoothing result.
• Few components gradually deformed from one thickness to another when connecting to another compoent, therefore a single average thickness was assigned to them.