July 8, 2019 at 5:02 pmsehallsanchezSubscriber
I am learning to use the Coupled Fields ACT extension's tools to do piezoelectric simulation and I am testing a simple setup where a cube piezoelectric body is subject to deformation and I want to measure the voltage generated. However, when I want to solve for the voltage, the program says that the VOLTdefined result is not recognized. It shows the following message:
"Unable to create user defined result. VOLT is not a recognized result in: 59 = VOLT"
Attached is an image of my current setup. Is this a problem with mechanical not recognizing my extension? If so, how do I make sure it does?
July 8, 2019 at 5:20 pmHuiLiuAnsys Employee
Could you use Piezo & MEMS ACT instead? Also a good check is to see in your solver.out file what element types you have. You should have element type 226 or 227 if Piezo is included
July 8, 2019 at 7:34 pmsehallsanchezSubscriber
I checked the type of elements I am using and they seem to be of type Solid 186. How do I change them to be type 226 or 227? Thank you.
July 8, 2019 at 8:32 pmSandeep MedikondaAnsys Employee
Please see this post
July 8, 2019 at 9:32 pmsehallsanchezSubscriber
Thank you for your help so far. I added into the command line the following:
However I have the following errors in my Solver Information:
***** ANSYS SOLVE COMMAND *****
*** WARNING *** CP = 0.391 TIME= 1506
There are no degrees of freedom defined.
*** WARNING *** CP = 0.391 TIME= 1506
Element shape checking is currently inactive. Issue SHPP,ON or
SHPP,WARN to reactivate, if desired.
*** ERROR *** CP = 0.391 TIME= 1506
SOLID226 element 1 must have a nonzero KEYOPT(1) value.
July 9, 2019 at 12:12 amSandeep MedikondaAnsys Employee
Please read through the docs on SOLID226.
You would have to specify KEYOPT(1) = 1001 for Piezoelectric or Electrostatic-Structural analysis.
If you are not familiar with APDL, you might find this article helpful.
July 9, 2019 at 8:54 pmHuiLiuAnsys Employee
You can use command object to change the element type and apply BCs loading etc, like Sandeep pointed out. A simpler way is to use the Piezo & MEMS ACT instead of coupled field ACT you have right now. I think the latter is no longer maintained, since a few versions back...
July 9, 2019 at 10:05 pmsehallsanchezSubscriber
Thank you so very much to both of you. I learned how to change to the solid type 226 but was still having a little bit of trouble. I finally switched to the Piezo & MEMS extension and not it is working fine.
July 11, 2019 at 7:37 am
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