When generating the FE mesh of an ETFE cushion, some problems occur. I cannot find any mistake. What can I do?

Answer

In most cases, the problem is that the finite elements of the cover surfaces are very close to each other in the edge area of the cushion when using Bézier surfaces. The FE mesh nodes of the bottom and top surface might be combined then. In principle, there are two approaches:

1. Numerical solution of the problem:

You can adjust the tolerance for combining FE mesh nodes by using the menu "Tools" → "Regenerate model."

2. Geometrical solution of the problem:

A more workable solution is to increase the distance between surfaces by using the boundary surfaces as shown in Figure 01.

Keywords

Cushion Mesh generation FE mesh Mesh generating ETFE

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RFEM 5.xx

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Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

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