Week 3 - 2D meshing for sheet metal

AIM:

To mesh the given hood components using quality criteria after cleanup the geometry and extract the midsurface .

OBJECTIVE:

S.No	Quality Criteria	Value
1	Target/Average length	5
2	Minimum Length	2
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	Maximum Tria Angle	120
10	Tria Percentage	15

PROCEDURE:

The hood component had 4 components as follows

• Latch (1.2 mm thickness)
• Hinge (1.2 mm thickness)
• Inner panel (0.75 mm thickness)
• Outer panel (0.75 mm thickness)

At first the component didn’t get a proper resolution, so that assign the length of perimeters and macros as target length 5mm. (mesh-perimeter-length) this help us to see a fine resolution of the components and also get a proper mesh flow.

GEOMETRY CHECK:

After this check the geometry for cleanup. In ansa we have a automatic option to check geometry and cleanup(ckecks-geometry). After selecting this, select the execute tab and select the highlighted mistakes and fix all by one click.

Now assign property id for the given components by select ctrl+p fpr property database , assign that type the name,assign material card.

Extract the mid surface for the components using auto and manual midsurface tool. For auto midsurface (topo – face – midsurface), for manual midsurface (topo-faces-offset).

QUALITY CRITERIA:

Now get into mesh module to mesh the parts, at first assign the mesh parameters and quality criteria.

MESH:

Now prepare the components for meshing by give aproper surface cut to get a proper mesh flow and easy way to mesh.

Start meshing, use best mesh option to get a good mesh.

Here we go for edit in meshing by using many tools like reconstruct,split,join,swap,paste to remove the opposite trias, back to back trias and rotational quads in the mesh.

Once mesh the surface go to hidden mode to check the quality criteria to get a proper mesh as per the quality.

Finally check the quality criteria as given above and check the proper mesh follow in all parts.

CONCLUSION:

The hood components were meshed as per the quality criteria and got a proper mesh flow and assigned proper thickness for the components.