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NX and NASTRAN, different result with IGS import or NX part

NX and NASTRAN, different result with IGS import or NX part

NX and NASTRAN, different result with IGS import or NX part

(OP)
Dear all,


I've posted on UG/NX forum but it's probably more appropriate here, sorry for double posting

I'm quite new with NX/NASTRAN(7.5) package but I have a small FEA background.

I'm doing some practical testing to learn how to use NX with NASTRAN.

I'm getting bogged on a simple I beam made with 2D shell elements.

Simulation is quite simple : I beam with pivot ends and tranversal force. It's just bending !

When I draw my beam with an other CAD software(Rhino) and import IGES in NX simulation, everything run ok, hand calculation give same result.

But when I draw my beam with NX (I tried everything in a part or assembly, same result), with the same way of preprocessing, result are stranges with different stress on top or bottom (near 20% difference!).

http://files.engineering.com/getfile.aspx?folder=dc9ef321-b62a-4b98-8db6-c15445a4fe03&file=nx_beam_2D_element.JPG

Thanks for your help

Regards

Mitch  

RE: NX and NASTRAN, different result with IGS import or NX part

On MSC Nastran, there is a .dat or .bdf that contains all the model details.

On NX Nastran, I would compare the two files that contain all the model details from the two methods you mentioned. I don't know what file types they are since it is NX Nastran and I am a MSC Nastran user.

If you would like, you can post your files here and I can skim them to note any differences.  

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