Different simulation results in Nastran in CAD and Inventor stress analysis

[kynykuko]

I don't understand why but they are both uniform pressure analysis, but they give 2 different r results in Stress analysis and Inventor Nastran. Pic 1.1 ( Inventor Nastran ), Pic 2.1 ( stress Analysis ).
Hope everyone answers!

[gusi_cl]

Hi, this occurs to me sometimes, and I don't understand why....

I'll look to find a sample and I'll post it ASAP.

[Roelof.Feijen]

Hello @kynykuko ,

Please attach your model to this post. That will make it easier for us to investigate.

[kynykuko]

Do you use Ansys Workbench ? 

[kynykuko]

I have attached the file, hope you can help me. Thanks!

[Roelof.Feijen]

Hello @kynykuko ,

I have to guess about your analysis setup, because the part is empty.

Based on the pictures in your initial post, the displacement results in Inventor Nastran, I guess you are using Generic as a material type, or the material properties are incorrect.

Second: I create an analysis setup with your model. The results, displacement shape, look more or less the same.

When comparing Inventor Stress Analysis with Inventor Nastran, make sure that you are using more or less the same mesh size.  I have attached my model with analysis setup to this post. Hope this helps.

[kynykuko]

Wow, thank you for your help!!
  Why can you do that? I tried downloading the gate1GFN.ipt file you sent me, but when I open it with Nastra it shows me a window message like this 

I recalibrated the material, but the results in Nastran remain unchanged. If you don't mind, can you take a picture of your analysis setup for me? I am most grateful!

[Roelof.Feijen · Accepted solution]

Hello @kynykuko ,

I think you are not running the latest update on Inventor Nastran.

Please try to update to 2020.2. Instructions can be found here:

https://forums.autodesk.com/t5/inventor-nastran-forum/inventor-nastran-2020-2-list-of-changes/td-p/9...

[kynykuko]

You’re the greatest, thank you!
 And I still have a problem. can you guide me to calculate the simulation according to hydrostatic pressure ? 😅 

I don't understand the settings in this table clearly!!
Thank you again! 

[Roelof.Feijen]

Hi @kynykuko ,

The table is part of a variable load definition. Variable load definition is not available for/applicable to a hydrostatic load, because it creates its own variable load definition.

[kynykuko]

Thank you! 😁