Week 4 - 2D Meshing for Sheet Metal

Aim: Surface meshing on a Cross Car Beam (CCB) assembly.

Objective:

1. To check for the geometrical errors.

2. To perform Topology cleanup accordingly.

3. to implement meshing according to the required quality criteria.

SL.no Quality Criteria Value

1. Target length 5

2. Minimum length 3

3. Maximum 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. Tria percentage 15

Procedure

1. Importoing the CAD model from the from the desktop page as follow:

Import the model from the file option bar -->new-->select the file from the particular location.

2. after importing the CAD model, first and for most need to check the material. This is done to check the whether the material is defined to model or not. This is done to check whether the material is defined to model or not.

In the similar way find any error in geometry of the particular model as follow. There get a few geometry error, which is need to be fix. The geometry occurs due to cons in structure it may be single cons and triple cons. There are some open surfaces that are generating single cons and it is filled by building surfaces in FACES option.

3. Mid surface was generated for each component by manual method, using offset command. Topology is performed on each component individually. after generating mid surface for each component, another geometry check is conducted.

4. Meshing: mesh length, macros with mesh parameter and mesh quality criteria must be provided priior to mesh generation but since need to select the entire gemotry at once, need to utilize the same length for all of the geometry. mesh is generated in 5mm size.

setting the mesh parameters as follows as shown in below:

setting the quality parameters as shown:

Best command is used to generate mesh at the sam% and tria element e time Quality check is performed on the generated mesh. mesh is gernated accordingly such that it obeys the required quality criteri. Parallely, mesh clean up is done using the combination of different commands.

This is the final mesh model where quad element is 98% and tria element is 5%.

Final model:

Conclusion:

Cuts were added, removed as per the requirement to obtain the uniform mesh as much as possible. Final mesh was obtained with no error and satisfies all the required quality criteria.