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Miscellaneous Software Topics / Re: "Run Nastran" Fatal Error
« Last post by James on October 02, 2019, 06:19:34 PM »
Can you confirm that the FEM ran successfully after you updated the input file.. before you tried to run HyperFEA?
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Miscellaneous Software Topics / "Run Nastran" Fatal Error
« Last post by James.rogers@nasa.gov on October 02, 2019, 04:51:07 PM »
I recently removed some components from a FEM within Patran and created a new load case for the model. When I imported the .bdf and .F06 into my original "FEA Project" I expected some assemblies to be empty, and for me to have to remove them. Unfortunately, the component names and numbers were nearly all mixed up. I reassigned the correct component numbers, names, assemblies, and display groups to each individual component. When I used the "Run Nastran" feature, it would perform the initial sizing, but encounter a fatal error when solving.

Attached is an image of the error message within the "Run Nastran" feature, and the fatal error message within the i.f06.

Any insight would be appreciated.
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Miscellaneous Software Topics / Re: Material Orientation in COM interface
« Last post by Stephen on September 13, 2019, 11:21:39 AM »
Ruben,

OK I think I understand. There is an additional challenge associated with this however, because components do not inherently have an x-direction in HyperSizer, only elements do. Although the material directions in a component should be generally consistent, this is not a requirement (example: tapered stiffeners on a wing). The same logic applies with normal directions although there are few useful reasons to have them non-uniform.

Unfortunately I do not think there is a good way to extract the modified material directions from  HyperSizer unless a FEM update is performed and they are extracted per-element from the FEM. Note that a FEM update can be executed from the scripting API, if that is helpful.

-Stephen
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Miscellaneous Software Topics / Re: Material Orientation in COM interface
« Last post by Ruben on September 13, 2019, 09:42:14 AM »
Hi Stephen,

I'm extracting the component buckling dimensions and centroids from Hypersizer and attempting to draw the component in 3D space. If I use the original FEM data to get the x direction and the element normal from an element of a component and the user changes the x direction or the normals, then my representation is wrong.

Regards,
Ruben
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Miscellaneous Software Topics / Re: Material Orientation in COM interface
« Last post by Stephen on September 13, 2019, 08:41:32 AM »
Hi Ruben,

Unfortunately, material orientations and element normals are not available through the scripting API. Can you clarify the issue you are concerned about? Are you attempting to determine element orientations? Perhaps there is another way the information you need can be obtained.

Thanks,
Stephen
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Miscellaneous Software Topics / Material Orientation in COM interface
« Last post by Ruben on September 13, 2019, 07:42:13 AM »
Hello,

If a user changes the orientation within HS, I can no longer use the element material orientation to determine the x and y directions. Is the material orientation exposed in the COM interface (and the normal for that matter).

Thanks,
Ruben
17
FEM Coupling (HyperFEA) / Re: Material properties updated to Nastran deck.
« Last post by RobDexter on September 12, 2019, 09:10:23 AM »
Hi, An update - and some success.

Setting all the temperatures on the set-up form to one temperature, then switching to Final Analysis to re-analyse the project before updating the FEM ensures that materials are output at that temperature.

If the job is split into one deck per temperature, while all decks are output at the given temperature, this can be repeated at each temperature needed and the appropriate decks selected, run and results re-imported for the next iteration.

Temperatures can then be re-set in the set-up form (imported from spreadsheet) before the next iteration.

I've not looked at what's used in HyperFEA.
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FEM Coupling (HyperFEA) / Material properties updated to Nastran deck.
« Last post by RobDexter on September 09, 2019, 09:53:57 AM »
Hi.  How do I get the correct material properties when I update the FEM?

When performing a Nastran Update, it seems to output the material properties at the analysis temperature of the last loadcase in the list.
If I split my job into two decks, one for hot cases & one for cold, the composite flange properties (MAT1 cards) are correct in each deck – hot in hot, cold in cold.  However, the composite panel materials are all at the temperature of the last load case in the list.  Is there a way to ensure that all materials reflect the appropriate temperature?  (Each of my decks contains one thermal and one mechanical load.)

If I can't get the properties to match the load temperatures, I’d like to update the FEM for all properties at one temperature for all cases (inc. panels and flanges), so I can use the one deck.  Is this possible?.

Re-setting temperatures in the set-up form before updating doesn't affect flanges (I assume they're calculated during sizing & stored elsewhere).  Panels seem to all use the temperature of the last mechanical case.

Any tips on controlling material properties when updating Nastran decks would be extremely welcome.
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Scripting / Re: Orthogrid 90degree stiffener spacing in Spreadsheet Utility
« Last post by August on September 04, 2019, 12:33:27 PM »
Hi Ruben,

The keyword for 90deg stiffener spacing is not included in the spreadsheet utility by default. However, you can easily add it by adding the VBA code shown in the three attached screenshots. The 90deg spacing can then be retrieved with the "Sy" keyword.

Best,
-August
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Scripting / Orthogrid 90degree stiffener spacing in Spreadsheet Utility
« Last post by Ruben on September 04, 2019, 09:31:28 AM »
Hello,

I'm trying to report the 90 degree stiffener spacing in the spreadsheet utility, but I'm not sure of which keyword to use. The only keywords for stiffener spacing appear to be s, sx and spacing, which are all for the 0degree stiffener. I can write some Python script to extract the 90degree spacing, but just wondered if it was possible in the spreadsheet utility.

Thanks,
Ruben
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