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05-13-2016 10:23 AM

Hello All ,

Is it possible to define only simple support constraints in the model ? (in ex. thin plate simple supported on edges ) .

Or I have to define at least 1 fixed constraint to get the results ?

Thank you !!!

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7 REPLIES

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05-13-2016 01:52 PM

Dear Alex,

I don't understand very well the question, could you please make a drawing sketching the problem?.

You can define any constraint you like (pinned or fixed), in geometry or directly in nodes, but your model should be stable, not rigid body motion should exist or the NX NASTRAN solver will give you FATAL error, OK?.

Best regards,

Blas.

Blas Molero Hidalgo, Ingeniero Industrial, Director

IBERISA • 48004 BILBAO (SPAIN)

WEB: http://www.iberisa.com

Blog Femap-NX Nastran: http://iberisa.wordpress.com/

IBERISA • 48004 BILBAO (SPAIN)

WEB: http://www.iberisa.com

Blog Femap-NX Nastran: http://iberisa.wordpress.com/

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05-13-2016 02:43 PM

Hi Blas, thank you for replying .

When I trying to define only simple support constraints (4 edges) for my model (some box lid) I get the message "No results are found" if I tying to open the results . It seems that the solver didn't solve the solution because the solve time too short (even for 101 linear).

In case that I add a fix constraint - everything going OK and I get reasonable results .

But than I have some unwanted stress results in the areas where the fix constraints were defined.

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05-13-2016 02:56 PM

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05-13-2016 03:39 PM

Hi TENTECHLLC ,

Does it means that I will get same "bug" if I'll run the 106 Nonlinear ?

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05-13-2016 04:09 PM

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05-14-2016 07:05 AM

Dear Alex,

Please revise your nx nastran *.f06 output file in the model directory and search for FATAL word, you will see there the reason of the error.

Or better run a **Normal Modes/Eigenvalue analysis (SOL103)** and animate the first mode shape, you will see the reason of the error, why your model is wrong constrained (to learn more take a look to my post at the following address: https://iberisa.wordpress.com/2011/02/20/mensaje-de-error-de-nx-nastran-run-terminated-due-to-excess...

Or post your full NX AdvSim model here --both *.prt, *.fem & *.sim files-- and we will take a look to it, OK?.

Best regards,

Blas.

Blas Molero Hidalgo, Ingeniero Industrial, Director

IBERISA • 48004 BILBAO (SPAIN)

WEB: http://www.iberisa.com

Blog Femap-NX Nastran: http://iberisa.wordpress.com/

IBERISA • 48004 BILBAO (SPAIN)

WEB: http://www.iberisa.com

Blog Femap-NX Nastran: http://iberisa.wordpress.com/

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05-15-2016 04:32 AM

For now I solved it by defining small enforced displacement in reasonable areas .

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