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Error while sizing Uniaxial components

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Ryan:
It would be helpful to which load case is causing the FTB error. It's likely that the load case has tensile Ny load. When you disable FTB, there's no way to get this information.

-Ryan

ULBsha:
I don't understand so... what should I do ?
There is only one mechanical load case since the thermal loads are zero... The mechanical load case is representative of pressure load on the fuselage skin during the cruise...


Thanks.

Ryan:
OK. If there's only one load case then that's it's the one causing the error. I will contact you later to see if we can run this component in V7.

-Ryan

ULBsha:
Dear Ryan,

I have a very strange error with uniaxial components. I thought here was the most appropriate topic to ask for.

Just after setting up a project, the analysis can be done without any issue. HyperFEA also works fine. However, when I update the bounds and re-run HyperFEA, I get the following error:

"Application Error in clsHyperSizerImport::DhsImport [ Sub ]( ) "

Actually the project has several groups, with only one component per group. I have several uniaxial groups, and by changing step by step the value of the bounds, I noticed that for some combinations of only one of these uniaxial groups, this error occurs.
For instance, here are 5 different tries:

1) This one works:
- Top face thickness range: 1-200mm
- Web thickness: 1-100mm
- Stiffener spacing; 1-1200mm

2) This one works:
- Top face thickness range: 1-103mm   <-- decrease
- Web thickness: 1-100mm
- Stiffener spacing; 1-1200mm

3) This one DOESN'T work:
- Top face thickness range: 1-102mm   <-- decrease
- Web thickness: 1-100mm
- Stiffener spacing; 1-1200mm

4) This one works again:
- Top face thickness range: 1-102mm
- Web thickness: 1-200mm                     <-- increase
- Stiffener spacing; 1-1200mm

5) This one works as well:
- Top face thickness range: 1-102mm
- Web thickness: 1-100mm                  <-- back to 100
- Stiffener spacing; 1-1000mm            <-- decrease


Not that the buckling span is 4500mm.


Thanks for your help
Regards

Ryan:
It's probably the same issue as before.

Your bounds are extreme which are causing numerical issues - probably with postbuckling. I would tighten up the bounds to be more in line with the reality and disable postbuckling.

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