11 Replies Latest reply on Mar 10, 2015 2:40 PM by Jared Conway

Static Simulation does not run.

Ryan Hader Mar 9, 2015 8:57 AM

Can Someone help indicate what I have done wrong with this model??

It is a simple model which is a shell / cover and I want to fix the base end of it and apply a load to exterior surface. Should really be pretty simple. But every time I attempt to run the simulation it comes up with an error saying that 'no restraints defined' and when I select the base face of the model (the only flat face) at first it accepts the selection however once you attempt to run the simulation an error comes up within the 'Fixtures' selection and it will not allow you to select the face that needs to be fixed and comes up with a 'select entity on shell' error.

It meshes well and I have done a couple of similar models that do run the simulation like this so I am unsure why this one will not??

Please help.

Fized Shell for Static Load Study.zip 443.1 KB

Re: Static Simulation does not run.

Attilio Colangelo Mar 9, 2015 9:35 AM (in response to Ryan Hader)

There is a combination of surfaces and solids getting in each other's way. I suppressed the "Surface-knit1" feature which seems to not effect the geometry but leaves a single solid body. This body meshes and solves good,

However, I recommend building a surface-revolve for the entire part. This will make for a simpler geometry and shells (as opposed to solids) in FEA mode would be more accurate for this geometry.
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- Re: Static Simulation does not run.
  
  Ryan Hader Mar 9, 2015 9:54 AM (in response to Attilio Colangelo)
  
  Thank you for the suggestion.
  
  I tried suppressing the 'Surface-knit1' feature - however it still seems to not want to run for me and comes up with the same error...?
  
  DO you mind sending me the file that you ran to see what you have changed??
  
  And yes I agree using the 'revolve' feature would be better and I was trying to come up with a way to do that as this shell is not completely symmetrical it is difficult to define an axis.
  
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  - Re: Static Simulation does not run.
    
    Ryan Hader Mar 9, 2015 9:57 AM (in response to Ryan Hader)
    
    I am still getting this error when I select the face to be fixed:
    
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    - Re: Static Simulation does not run.
      
      Attilio Colangelo Mar 9, 2015 10:05 AM (in response to Ryan Hader)
      
      Yes, I was getting the same error before making changes. See attached model "Static4". "Surface-Knit1" needs to be suppressed/rolled back.
      
      StaticStressAnalysis.zip 15.5 MB
      
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      - Re: Static Simulation does not run.
        
        Ryan Hader Mar 9, 2015 10:22 AM (in response to Attilio Colangelo)
        
        Thanks for that!
        Interesting - I had done the same thing but I had not started a 'new study'..
        
        It would appear that you have begin a new study to have such changes take affect??
        
        Thanks for the help. It would appear that I did not require the 'Surface Knit' feature at all? I was assuming it was needed to merge the two entities together but it would appear that is not the case?
        
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        Re: Static Simulation does not run.
        
        Attilio Colangelo Mar 9, 2015 10:50 AM (in response to Ryan Hader)
        
        When studies "go bad" they almost always have residue even after fixing/making changes. Some combination of creating a new study, copying the part to a different directory, deleting existing Simulation databases will allow the model to refresh.
        
        Unfortunately this is not something that you will find in typical documentation for any software.
        
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        Re: Static Simulation does not run.
        
        Ryan Hader Mar 9, 2015 11:28 AM (in response to Attilio Colangelo)
        
        Well thanks again. I spent several hours trying different things last night and did not always attempt restarting a new solution.... SO I learned a couple of things today.
        
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        Re: Static Simulation does not run.
        
        Attilio Colangelo Mar 9, 2015 2:28 PM (in response to Ryan Hader)
        
        No problem. Can you mark this as "answered", or "correct answer", (not sure how this forum works in that regard).
        
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        Re: Static Simulation does not run.
        
        Ryan Hader Mar 9, 2015 2:31 PM (in response to Attilio Colangelo)
        
        indicated answered to your original corrective post.
        
        Cheers.
        
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        Re: Static Simulation does not run.
        
        Attilio Colangelo Mar 9, 2015 2:49 PM (in response to Ryan Hader)
        
        Thanks. I saw that but it appeared one of your questions was marked as "correct answer" as opposed to my answer. I'm new to this forum so not sure how that part works. Thanks!
        
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        Re: Static Simulation does not run.
        
        Jared Conway Mar 10, 2015 2:40 PM (in response to Attilio Colangelo)
        
        you could also exclude at the study level instead of suppress/unsuppress
        
        and sometimes "updated all components" will fix the issue you describe
        
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