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Valued Contributor
scudelari
Posts: 105
Registered: ‎10-11-2011
Accepted Solution

MES - Von Mises With Isotropic Hardening Material Model Shell Elements BUG 2014

178 Views, 3 Replies
11-26-2013 03:20 AM

Hello Everyone,

 

I am trying to perform a Nonlinear analysis on a rather simple shell model but there is a bug within the interface of the program.

 

BASIC INFO:

I am running Mechanical 2014 SP1 64Bits.

 

The part is a surface with the following setup:

2013-11-26 09_06_56-Autodesk Simulation Mechanical 2014 - [FEA Editor - [Concept.fem]].png

 

In the Element Definition Dialog, I select:

2013-11-26 09_07_22-Autodesk Simulation Mechanical 2014 - [FEA Editor - [Concept.fem]].png

 

Which basically is:

- Selecting Von Mises with Isotropic Hardening

- Inputting 37.5mm as the thickness of the plate

- I then hit OK

 

If I go back to the material definition, the thickness is weirdly defined as 1mm, ignoring my changes.

2013-11-26 09_08_42-Autodesk Simulation Mechanical 2014 - [FEA Editor - [Concept.fem]].png

 

Can anyone please confirm whether this is a bug or not?

 

Things I have seen: 

1- If Isotropic is selected, the thickness of 37.5 is retained.

2- If Von Mises Curve With Isotropic Hardening is selected, the thickness of 37.5 is retained.

 

I also attached the very simple model so you guys can try it out.

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Product Support
KubliJ
Posts: 30
Registered: ‎11-16-2011

Re: MES - Von Mises With Isotropic Hardening Material Model Shell Elements BUG 2

11-26-2013 03:42 PM in reply to: scudelari

Hello,

 

I can confirm that this is a bug that we are aware of and are working on resolving.  There is no ETA on a fix; I can only recommend keeping Simulation up-to-date.  I apologize for the inconvience.

 

Thanks,

James



James Kubli


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Valued Mentor
AstroJohnPE
Posts: 494
Registered: ‎08-30-2012

Re: MES - Von Mises With Isotropic Hardening Material Model Shell Elements BUG 2

11-26-2013 06:29 PM in reply to: KubliJ

There have been cases where the solver used the proper input even though the interface would show a "default" value when you re-edit the input. So the question for you scudelari is whether the results are based on a thickness of 1 or the value that you enter?

John Holtz, PE
Mechanical Engineer
Pittsburgh, PA

16 years experience with Simulation Mechanical
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Valued Contributor
scudelari
Posts: 105
Registered: ‎10-11-2011

Re: MES - Von Mises With Isotropic Hardening Material Model Shell Elements BUG 2

11-27-2013 03:41 AM in reply to: AstroJohnPE

Hello John,

 

Unfortunatelly I have to say that the value does come back to 1mm after I close the first dialog. 

 

I checked it with the display element thickness in the Results environment.

 

As a work around - at least for my model it was possible for the 2D nature of the model - I selected element type 2D, which does work.

 

As I said, I also found out that with the Von Mises Curve it keeps the thickness value, therefore one may use that as a workaround for the time being.

 

Best Regards,

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