Generate mesh on IGES Models

An *.iges model is a representation of the model surface that needs to be converted into a volume prior to analysis.

There are three main parameters to consider when working with *.iges models.

Global edge length

An appropriate global edge length needs to be set when meshing an *.iges model. Use the Preview feature on the Generate mesh dialog (Mesh tab > Tools tab > General tab > Preview) to view the proposed mesh density and adjust as required.

Chord height

The chord height is used when calculating the edge length around a curve for an *.iges format. The edge length is shown by the distance 1 - 2, while chord height is represented by the distance 3 - 4 the cord length. By default the maximum chord height is 0.1mm.

When changing global edge length, the chord height value automatically changes too to reach 5% to 10% of the global edge length value. The chord height may need to be changed manually for:

• Small curves, as there are not enough elements to work with. The chord height must then be locally reduced.
  Note: Fillets and other small features usually do not need to have fine mesh refinement.
• Very large curves, as a large number of elements might be generated. The chord height should then be increased locally .

Merge tolerance

By default the merge tolerance is 0.1mm. This parameter allows the software to create surfaces by merge face edges separated by less than the specified value. The *.iges format only provides a set of individual surfaces that are not connected. The merging of the faces forms a watertight body that is required for analysis.

Note: To personalize the Merge tolerance , click (Mesh tab > Mesh panel > Generate Mesh). Select the NURBS tab and enter the appropriate value.