Week - 5 - 2D meshing for Plastic components

AIM: To perform geometry clean up and shell mesh the given model of a bottle cap with given quality criteria.

Required quality:

S.No	Quality Criteria	Value
1	Target/Average length	1
2	Minimum Length	0.5
3	Maximum Length	3
4	Aspect	5
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:

1. open the model in ANSA v23.0.2 using file>>open.
2. Perform topo on the whole model and check for geometric errors by using checks>>geometry under the tools menu. Clear all the errors.
3. Refine the geometry by changing the length of elements to 1 mm. Do this by using the length button under perimeters in the mesh module.
4. Measure the thickness of various regions of the model. The model is found to have a varied thickness in different regions. Since the thickness is less than 6 mm at most of the regions, shell mesh needs to be done. The next step is to generate the mid surface by various techniques.
5. Generate the mid surface. Manual mid-surfacing was chosen due to complexity in the geometry. Mid surfaces were generated by using the middle option and offset option under faces in the topo module.
6. Measure the thickness of various regions of the model. The model is found to have a varied thickness in different regions. Since the thickness is less than 6 mm at most of the regions, shell mesh needs to be done. The next step is to generate the mid surface by various techniques.
7. Generate the mid surface. Manual mid-surfacing was chosen due to complexity in the geometry. Mid surfaces were generated by using the middle option and offset option under faces in the topo module.
8. Prior to meshing, Mesh quality and quality criteria were set according to the requirement
9. The next step is to mesh the generated mid-surface. The length of elements was set to 1 mm(target length) by using topo>>perimeter>>length.
10. 1. The quality could not be cleared at a few regions because of geometry complexity.

    Result:

    1. A geometry clean up was performed.
    2. mid-surface was generated.
    3. The mid-surface was meshed as per the required quality parameters.
    4.