Physical properties changing on their own

[Anonymous]

Hello,

I'm having problems with defining material properties and thickness of shell elements. As you can see in the attached video every time I open the material definition it will do some shenanigans with the E-modulus, this is also the case with shell thickness. I have tried to change analysis units to SI (model units are mm) but the weird behavior persists.

This is very unnerving since I get all sorts of errors and problems with running the analysis, thickness disappears and E-modulus change does result in excessive deformations.

Any suggestions on how to remedy this?

[John_Holtz]

Hi @Anonymous

I think that  both of those problems are related to the Windows regional settings; in particular, what character is used for the decimal symbol. (Usually a period "." or comma ",") See if the descriptions in these two articles solve the problem for you.

• Shell thickness input does not work in Autodesk Nastran In-CAD
• Modulus of elasticity is not saved in Autodesk Nastran In-CAD

Let me know if you have any suggested changes for either of those articles.

______________________________________________________________

If my post answers your question, please click the "Accept as Solution" button. This helps everyone find answers more quickly!

[Anonymous]

Thank you,

changing regional settings did not solve this but changing the units in the Inventor model itself to meters through Tools>Document Settings>Units seems to work.

What is strange is if my inventor file is in mm the window of the material properties displays the unit as MPa so you would assume that it has adopted millimeters but alas it doesn't. 

Maybe this is stated within your links but I get page not found error (might be because I'm posting from a private account since I don't have access to our corporation support account at the moment).

[John_Holtz · Accepted solution]

Hi,

Sorry for the two problems: the ones in the software, and the ones with my links! Here are correct links to the articles:

• Modulus of elasticity is not saved in Autodesk Nastran In-CAD - https://knowledge.autodesk.com/support/nastran-cad/troubleshooting/caas/sfdcarticles/sfdcarticles/Mo...
• Shell thickness input does not work in Autodesk Nastran In-CAD - https://knowledge.autodesk.com/support/nastran-cad/troubleshooting/caas/sfdcarticles/sfdcarticles/Sh...

This old saying comes to mind and seems relevant in this situation: "To Err is Human; To Really Foul Things Up Requires a Computer".