Week 4 - 2D Meshing for Sheet Metal

AIM: Perform a pre-processing for sheet metal component by eliminating geometrical error, using ANSA pre-processing software.

OBJECTIVE:

• Generate mid-surface manually and perform geometry clean-up on the component.
• Generate mesh with proper mesh flow, with target element size of 5 unit.
• Check the quality of the element according to the given quality criteria.

S.No.	Quality criteria	Value
1	Aspect ratio	3
2	Skewness	45
3	Warping	15
4	Jacobian	0.7
5	Min. Length	3 Unit
6	Max. Length	7 Unit
7	Min angle Quad	45
8	Max angle Quad	135
9	Min angle Tria	30
10	Max angle Tria	120
11	Tria %	10

PROCEDURE:

• Firstly we need to open .step file of CCB model.

• Then we need to check all the parent geometry. And repair the geometry.

• After this we need to create mid surface with the help of off-set command (before this we need to check the thickness of the component)
• Then we need to create different PDI for mid-surface we have created, so that we can provide thickness and different property to that mid-surface. And check the mid-surface geometry again.
• Now before creating mesh we need to alter shell element length as 5 unit for both perimeters and Macros.
• Now we need to clean the geometry and prepare proper construction line for better mesh flow and avoid minimum element length.
• After this we need to give input of given quality parameters. And mesh parameters

• After this we have to create mesh.

Classic mesh > Mesh generation > Best > select surface > click middle mouse button.

Then we need to check mesh flow and for improving mesh flow we need to use commands like Reconstruction, Improve, Fix quality, Split, Join, Swap.

• Simultaneously we need to check quality criteria and improve quality at the same time.