The Mid-Surface Extraction and Meshing for Backdoor Model using Hypermesh

Aim: To Extract the Mid-Surface and the mesh the Backdoor model for a Hachbak car according to the quality criteria.

Abstract: The given component is a backdoor of a hatchback car. This part is a sheet metal and so the thickness is very low that is 0.75mm. So, Instead of a 3D meshing. we can go for 2D meshing and assign the Thickness for the 2D Shell mesh.

Procedure:

Step 1: Import the Geometry

This Model is a .igs file format. so, I can Import this model using import option and save into '.hm' file

Step 2: Geometry Cleanup

After this model is imported. a lot of components are created and in geometry also have a single and Tripple coons. So, First I can detach all the Tripple coons and fix them into the proper surface.

After resolving all the ingle and Tripple coons. Then I can organize the model namely,

1. Inner Panel
2. Outer Panel
3. Bottom

Step 3: Extracting Te Mid-Surface

After Successfully organized the model, Remaining unwanted components I can delete and extracted the Mid-Surface. Once, Mid_Surface extracted I can Rename and Organized the model using the following component name.

1. Outer_Panel Mid_Surf
2. Inner_Panel Mid_Surf
3. Bottom

I am also tried Extracting Mid_Surf using Surface edit > Offset Option. This Option is really helpful whenever the auto midsurface option is not extracted Mid_surface well then we can extract manually using this option.

Step 5: Symmetry Check

Once the Mid surface is organized well. Next, I will jump out to the symmetry check. This model is totally symmetric. So I will only work half of the portion. Hence Half portion is deleted.

Step 6: Quality Criteria

The Next is to set up quality criteria as per given.

Step 7: Autocleanup

The auto cleanup option is very helpful when the distance in two lines is less than the target element length. This option is toggled unwanted lines and connect the surfaces.

Step 8: Automesh

After Cleanup the geometry, I can mesh this surface using the automesh option.

Step 9: Resolving Mesh

When the meshed this mode. A lot of trias are created. Usually, trias is not preferred for durability or any other simulation. So, I can convert all trias element into quad using Automesh > element option

Step 10: Reflect the Mesh

Once the mesh is fine as per quality criteria. I can reflect on the mesh using reflect option.

Step 11: Check the Free Edges

After the reflect the mesh. the center mesh is not attached. So, I can use the Edges > Equivalence option to connect all the elements.

Conclusion:

After Performing the meshing for the backdoor model. I can able to understand how to mesh the geometry as per quality criteria and minimize the required meshing time.