Shell element that supports output of Equivalent (Von Mises) strain or Equivalent strain

[andradesilva]

Hi,

I am doing a static analysis in ANSYS Workbench 18.1. I am using shell elements. I want to get Equivalent strain, or if that is not possible, principal strains, so I can calculate the equivalent strain.

The default element for this analysis is shell181. However, I don't think it supports the Equivalent strain (EPTO,EQV) or even Equivalent strain (EPEL,1;2;3)

I tried to change element type by adding an ANSYS APDL command right at the top of the project tree: et,1,shell93

I read that this element supports EPEL,1 2 and 3 output to text files. However, it still does not work out, and I get a message related to the *get command, saying that the requested data is not available.

Is there any shell element that supports output of these results?
Or can shell93 do the work, but I am not issuing the right command, or at the right place. I am issuing the et command in the geometry section.

Please help,
Best regards,
Andrade Silva

 

[STpipe]

I'm not familiar with Shell93, however perhaps there's an additional key option that you need to activate to have access to the data you're looking for?

Shell181 is one of the more advanced element formulations available in ansys, so I don't see why you wouldn't be able to extract the results you're looking for. According to the manual, the equivalent elastic strain should be available EPEL:EQV.

https://www.sharcnet.ca/Software/An..._elem/Hlp_E_SHELL181.html#shell181.tab.2.ft.7

 

[NRP99]

andradesilva

Please read forum posting policies here-

https://www.eng-tips.com/market.cfm

and

https://www.eng-tips.com/faqs.cfm?fid=376.

Shell181 element supports output of Equivalent strain.

 

[andradesilva]

Dear NRP99,

If you look here:

https://www.sharcnet.ca/Software/Ansys/16.2.3/en-us/help/ans_elem/Hlp_E_SHELL181.html

Shell181 elements do NOT support EPTO, EQV outputs. Also, I am an experienced ANSYS user, and I can do most trivial things. If I am posting here, it's because I already tried it. Thanks for your help, anyway.

Best wishes,
Andrade Silva

 

[scheah]

Shell181 elements do NOT support EPTO, EQV outputs

Given EPTO EQV is total equivalent strain, I'm able to get that for a simple shell model in Workbench.

Is this what you were after?


Kind regards,
Jason

 

[andradesilva]

I can obtain the countours. That is not the question. The question is that I am using the *get and *vfill comands, and the *get command does not really get S,EQV altough it gets U,Y. I want to export S, EQV to an output text file. I can get everything to work out on the GUI, however, I need to automate writing of an output file on each project run.
I tried to change element type to one that supports S,EQV, like Shell63 or Shell43. It still does not work out.

Any suggestions?

Thanks for the reply,
Best regards,
Andrade Silva

 

[scheah]

Andrade Silva,

Also, I am an experienced ANSYS user, and I can do most trivial things. If I am posting here, it's because I already tried it.

I implore you to be kinder to others. Your blunt response may not be taken well. STpipe, NRP99 and I have taken the time to respond. We're all trying to help each other.

The question is that I am using the *get and *vfill comands, and the *get command does not really get S,EQV altough it gets U,Y.

I didn't need to change the elements (default 181) to export the EPTO, EQV outputs.

/post1
set,last
alls
*get, ncount, node, 0, num, max
*dim, EPTOEQV,, ncount 

*vget, EPTOEQV, node, 1, epto, eqv
*cfopen,myfile,txt
*vwrite,EPTOEQV(1) 
(E20.5)
*cfclos

Kind regards,
Jason