Week - 5 - 2D meshing for Plastic components

Objective :

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.

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

Cad Model Image :

Initial

Procedure:

1. Open file in ANSA and Topo the whole Model.

2. Go to the Length parameter and change length to '1'.

3.Check for Geometry and try fixing by selecting all error, select fix and if the error are still there solve using manual method.

4. Since its a Plastic component with a varying thickness. We have to create different properties. Measure the thickness of component and create a new property as per the thickness. Sometimes while creating the Mid-Surface we have to use 'Offset', 'Middle' Faces, 'Middle' Curves, 'New' Faces as per the component and create the Mid-Surface.

5. Check for Geometry for Mid-Surface and if there are error Fix it.

Note: while doing this untick the "Tripple-Cons".

6.Then input 'Mesh parameter', 'Quality Criteria', and 'Length Parameter' to the component.

7.Select 'Best' option to mesh the surface.

8. Click on 'Hidden' option to see quality criteria on surface, if the surface are failing the colour of in which quality criteria its failing, if it failing we have to sometime use 'Join','Cut' cons ,'Delete' the face and recreate new face, sometimes create new Cons using 'Cut' for better mesh flow and 'Reconstruct' or 'Smooth' option. , If the surface is failing 'off' will be shown, if the surface is not Failing on Quality Criteria, then the Surafce is ready as shown Below. We have to also reduce the Trios to Minimum for better result. For reducing tria and creating better mesh flow sometimes use 'Split', 'Swap', 'Smooth','Improve' as per the conditions

9.After that give thickness to the Mid-Surface by opening property. As Thickness Value same as Parent Geometry.

Note: For Varying Area give Average Thickness.

10. Go to quality criteria, click on 'Draw Shell as Solid' and click on apply.

11.After that the meshing for Plastic Bottle Cap model is Done using Manual Method. Check the whole Mid-Surface only visibling them to do final check.

Result :

2D meshing for Plastic Bottle Cap model is been done successfully.

Final Model Image :