New flatness and roundness optimization criteria

Use Optimization criteria to assess the effects of warpage on the quality of the molded part. Include optimization criteria in a DOE or Parametric Study analysis to see how critical areas on your part change, with changing processing conditions.

The optimization criteria are located on the Optimization tab of the ribbon. Create a flatness criterion to monitor how much a specific surface moves out of planar, following a warp analysis. Create a roundness criterion to see how much a specific rounded edge changes shape following a warp analysis.

Optimization criteria are automatically added to DOE and Parametric Study analyses. Click (Optimization tab > Optimization panel > Optimization), and open a builder to view them in the Criteria tab. Run a DOE or Parametric Study optimization analysis and view the results in the Results Comparison Explorer.

Optimization criteria are supported for warp analyses in all molding processes, and for the following mesh types:

• 3D
• Dual Domain
• Midplane

Flatness

Flatness measures the minimum distance between two parallel planes, that straddles all the selected points. The two parallel planes may not be parallel to any surfaces in the original geometry, nor to any coordinate axes. The orientations of the planes are determined by minimizing the sum of squared errors to find the plane which best fits all the selected nodes. Flatness does not report the deflection from any original geometry.

Select a single node on the surface of interest, and all nodes on that surface are automatically selected, if you have Auto select surface enabled.

Roundness

Roundness describes the maximum total deviation of the selected nodes from a best-fit circle. The maximum total deviation is the sum of the largest positive and largest negative deviation from the circle radius. The best-fit circle may not align with any features in the original geometry, nor to any coordinate axes. Roundness does not report the deviation from any original geometry.

Select a node on a rounded edge, and all nodes on that edge are automatically selected, if you have Auto select surface enabled.