Week 3 - 2D meshing for Sheet metal

2D MESHING OF A SHEET METAL (HOOD) WITH THE GIVEN QUALITY CRITERIA

Aim : For the given Hood model, Check the geometrical errors after that take the mid surface for all the components and mesh the mid surface with the given element Quality criteria.

Given Quality requirements :

SL.No	Quality Criteria	Value
1	Target/Average Mesh length	5
2	Minimum Mesh Length	2
3	Maximum Mesh Length	7
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
12	Tria Percentage	15

Procedure :

1. The Hood model is opened in the ansa software and the model initially contains only edges of 'single cons' indicating that the individual edges are connected to their corresponding surfaces as shown in the figure below. The red color on the edges indicates the same.

2. The 'Topo' option is used and the whole model is selected and by clicking the middle mouse button it connects all the corresponding surfaces making it a 'double cons' edges which is indicated by the color 'yellow'.

3. The whole model has to checked for any geometrical error before the meshing can be started. The whole model is selected and the 'Check' option is clicked and the 'Geometry' option is selected which opens up a geometric check window, where all the required checks are selected and is executed as shown in the below figure.

4.