FAQ 003235 | How can I smooth continuous boundary lines of membrane cuttings?

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Question

How can I smooth continuous boundary lines of membrane cuttings?

Answer

The perimeter of membrane cut-outs is described by boundary lines. These boundary lines can be formed by

  1. Globally defined boundary lines of the assigned membrane surfaces, or
  2. subsequently introduced cutting lines for the division of the cuts on the membrane surfaces.
In this case, the cutting patterns can only consist of a global line definition or the cutting lines applied subsequently, or the mixtures of both types.

Figure 01 - Boundary Lines of Cutting Patterns

Due to their fixed geometry description (arc, circle, spline, etc.), the global boundary lines are inviolable and are thus also implemented in the determination of the planar sections.

On the other hand, the subsequently applied cutting lines are based on the FE mesh of the surfaces assigned in the cutting line specification and have no influence on the mesh itself.


The cutting units encircled with boundary and cutting lines adopt the FE mesh of the assigned surfaces for flattening. Since the cutting lines run through the FE elements themselves, with no regard to the global mesh in the edge area, the edges of the original FE elements cannot be used to describe the cutting pattern limitation. In this case, the affected FE elements in the cutting line area are divided by the cutting lines.

Depending on the orientation of the cutting line, the FE elements are cut in the middle or almost on the edge. Since the FE elements on the edge can cause some problems with the geometry, a certain tolerance limit has been entered for the decision. This limit is used to control the critical aspect ratio between the FE edge length cut off with the cutting line and the original FE edge length. If the ratio is smaller than the given limit value, the section line is warped to the original FE node.

Figure 03 - Smoothing

This fact may lead to an "Irritation" of the cutting line if the cutting lines are close to the FE element edges. By reducing the tolerance limit shown, this situation is optimized.

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  • Updated 04/14/2020

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