Week - 5 - 2D meshing for Plastic components
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 the given element Quality criteria. (Refer to the table below for the Quality criteria)
|
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,
Step I - Import the geometry i.e, .step file (extension)using the file tab in the ANSA window.
Step II - Select parent geometry lock view and go for geometry check.
After checking for geometry, we get the following errors in the geometry. There were needle faces, triple cons, and crack errors in the geometry. This needle face error is nothing but the unwanted faces in the geometry which needs to be cleaned up. Triple Cons errors are cleaned using releasing the two surfaces and performing proper topo.
After geometry clean-up, we check for the thickness measurement of the various surfaces and extract the mid surface using various options.
Step IV - Extracts mid surfaces of the components using offset, middle & curve middle command.
Thickness is measured for various sections and the mid surface is extracted using the above command. Some surfaces where it was impossible to extract the mid surface due to unavailability of opposite faces there new surface is created using curve middle command and new faces option also some surface have been extracted using approximate/nearby thickness.
After extracting the mid surfaces each surface had been assigned a separate new PID and respective thickness.
Step V - Meshing the geometry using Mesh Module
Before meshing the modules, we assign perimeter length, mesh parameter, and quality criteria
geometry is meshed using the best command in mesh generation tool and with the help of various others commands like reconstruction, smooth, paste, join, etc
