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)

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 1:-Import the model.

File - open -select the model- open

Step 2 :- Checking geometry cleanup.

Checks -geometry - check the parametrs - exceute.

Failure :-

Step 3 :-Cleaning the geometry .

Selelct the all failures - right click -select fix -execute.

Step 4 :-Measuring the thickness of the component.

Measure -nodes -select- two nodes.

Step 5 :- Creating manual mid surfaces .

1 )creating mid surface using mid line.

• Creating Mid lines.

Topo -curve - middle

• Extrude the line by Vector

Topo - surfaces -extrude - Extrude -selelct the line - use vectors -select the two nodes to get direction and length -apply.

2 )

Offset the surface by

• Topo - offset -faces -selelct the surface

• Give the offset value with direction.

Assigning the property and thickness to the surface

• Offsetted surfaces.

Step 6 :- After mid surface completing we need doi geometrival clean up

• Creating surfaces .

topo -faces - new -cones - select the lines - create - assign propety and thickness.

• Fixing minimum gap .

Topo - faces - topo -select the lines -apply

• Fixed

• Extending the surface to get connection.

Topo - Faces - extend - select the line to extend -select the surface - extend .

• Extended surfaces

• Delelting the extra surface which is peniterated .

Topo - faces - intercept - select the surface one -ok -select second - ok.

• Deleting the surfaces .

Topo - faces -delete -select the surface -delete.

Manual Middle surface completed .

Step 7 :- Assigning quality criteria to the material.

Giving mesh parameters.

Step 8 :- Generating mesh .

Mesh - classic mesh - mesh genertation - best -selelct the surface - mesh.

Clearing the quality criteria .

• Imporveing the mesh .

mesh -shell mesh - reconstruction -selelct the elements - ok.

Removing the tria by

Mesh - elements - split - spliting the quad .

• To down the tria - mesh - grid - past -selelcttwo nodes of tria to paste .
• cleared ooset and assigned thickness to the component.

Meshing competed.

Final model with solid representation.

Result :- For the given Plastic Bottle Cap model, checked for the geometrical errors and take the mid surface by suitable mid surfacing techniques. PID and Thickness assignment has been done for all the mid surfaces. Mesh the same with given element Quality criteria.

Learning Outcome :-

*Leraned about hgeometrical errors and fixed it.

*Learned about taking manual midsurfacing and attaching to the surfaces .

*Leared the ools using for meshing nd passing the quality criteria .

*Leaned about assigning thickness to the component

Thanks

Renith Balachandran M