Week - 4 - 2D meshing for Plastic components

Objective

check for the geometrical errors, 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, perform Draw shell as solid

Cad model image

Procedure with required images

1. open cad modell in ANSA

2. do geometry cleanup from classic topo- use hot points, cons, faces, surfaces, curves, points, auxilliaries for this.

3. extract mid-surface. since the input part is plastic, faces-mid surface-skin command was used. but it gave improper results. so manual mid-sufacing using offset was used.

individual parts were offset and mid was taken.

4. do meshing from classic mesh - use hot points, perimeters, macros, grids, mesh generation, shell mesh, elements.

symmetry was used in the meshing. opposite trias were avoided. no two trias should touch each other. no trias were on the complex features like fillets. tria percemtage was less than 10.

there were no trias touching any cons or edges other than complex features. there were no rotational quads. there were no trias on edges or fillets. given quality criteria was

satisfied with the given meshing output.

5. draw shell as solid was performed to show how thickened meshing is similar to the original CAD geometry.

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

quality criteria is also attached with files.

Draw shell as solid performed

(refer attached images)

mid-surface and geometry cleanup images

(refer attached images)

Generating mesh on the given component with low tria concentration and proper mesh flow

(refer attached images)

Results and Final model images

already included above.