FAQ 004597 | When selecting the elements for a stiffener of a stiffened panel, I get a message saying that at least one of the selected elements is a null element. What should I do?

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Question

When selecting the elements for a stiffener of a stiffened panel, I get a message saying that at least one of the selected elements is a null element. What should I do?

Answer

Stiffeners may only contain the elements with a thickness t > 0 mm. If you select null elements (thickness t = 0 mm), the message shown in Figure 01 appears. It is necessary to replace the null elements by the elements with a thickness t > 0 mm.

Figure 01 - Error Message "At least one of the selected elements is a null element."

The stiffener shown in Figure 2 includes Element 8 and Element 3. However, Element 3 has a thickness t = 0 mm, so the message in Figure 01 is displayed. For Element 3, define a thickness t > 0 mm. As an alternative, you can delete Element 3 and connect Element 8 directly to the panel. This is also shown in the video.

Figure 02 - Stiffeners

Keywords

Dlubal FAQ Longitudinally stiffened Longitudinal stiffener Stiffener Panel Sheet metal panel Null element Frequently Asked Question FAQ about Dlubal Question and Answer about Dlubal

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  • Updated 11/30/2020

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