MESHING OF A BOTTLE CAP MODEL USING ANSA

MESHING OF A BOTTLE CAP MODEL

Objective:

To create 2D mesh for a bottle cap model with the given element quality criteria and to assign midsurface thickness to the shell elements using ANSA.

Methodology:

• Geometry cleanup
• Midsurface extraction
• Meshing as per criteria
• Assigning thickness property

Quality criteria:

Procedure:

As the thickness of the bottle cap model is very less,it is good to go for 2D meshing instead of 3D meshing.

Original geometry:

1.Geometry cleanup:

The given model is performed with topology to view the cons properly.

Then it is subjected to geometry cleanup.

The errors are checked and fixed as shown in the figure.

The outer surface of the model is oriented in grey coloured mode.

2.Midsurface extraction:

The given model is complex and has variable thicknesses.Hence different mid surface extraction methods are adopted.

• Offset method:

Some of the parts of the model are subjected to an offset method to extract their mid surfaces.

For example:The outer circular faces are performed with the offset option as shown in the figure.

• Single middle option:

Some of the parts of the model are subjected to the single middle option method to extract their mid surfaces.

For example:Ribs are performed with the single middle option method as shown in the figure.

• Multi middle option:

Some of the parts of the model are subjected to the multi middle option method to extract their mid surfaces.

For example:Small ribs are performed with the multi middle option method as shown in the figure.

Mid surface extraction of bottle cap model:

3.Meshing:

The given element quality condition is entered into the quality criteria tab and it is saved.

Batch meshing algorithm is used and the element type is chosen as mixed.

Advantages of batch meshing:

• Batch mesh generation is a well organized way of meshing complex components.
• The mesh flow in batch meshing is perfect.
• Batch meshing is a fast process and thus reduces human effort.
• Feature capturing is perfectly done in batch meshing.

4.Assigning thickness property:

While performing mid surface extraction,mid surface parts and properties are set to auto create options.

In the property tab,the midsurfaces are selected and renamed accordingly to their names.

The thickness values of each part are entered and their type is chosen as PSHELL.

The thickness properties are applied successfully.

Results:

The midsurfaces are meshed successfully and thickness values are assigned to them successfully.

The elements are visualized in solid representation using Shell as a solid option in the presentation tab.

Learning outcome:

1.Able to fix the geometrical errors in the model.

2.Learnt to create mid surfacing.

3.Able to mesh according to quality conditions and assign thickness properties.

Conclusion:

Thus 2D mesh is created for the bottle cap model according to the given element quality criteria using ANSA.