7 Replies Latest reply on Feb 1, 2016 1:21 PM by Dale Grossnickle

How do you restrain a model without influencing the results

Dale Grossnickle Feb 1, 2016 10:48 AM

I've attached a simplified version of a part with a force on the O.D. and a Sliding Restraint on a face. The simulation fails because (I think) is is looking for more restraints. Question: How do I restraint it and not influence the distortion? Because the part is dished and has a window cut in it, the dish shape should flex and the center shaft should move away from the Roller/Slider restraint and the axis should tip as indicated by the black arrows. If I add a fixed restraint the simulation will run but gives a non-realistic result. Any held would be appreciated.

Re: How do you restrain a model without influencing the results

James Riddell Feb 1, 2016 11:59 AM (in response to Dale Grossnickle)

Try using some small edge or even a point to keep the part from moving (which is what it is probably doing). Another alternative might be to use 'soft springs' or 'inertial relief'.
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- Re: How do you restrain a model without influencing the results
  
  Lloyd Vasilakes Feb 1, 2016 12:27 PM (in response to James Riddell)
  
  If I understand correctly, I would fix the outer perimeter of the disk and then apply the force load to the shaft.
  
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  - Re: How do you restrain a model without influencing the results
    
    Dale Grossnickle Feb 1, 2016 12:33 PM (in response to Lloyd Vasilakes)
    
    Thanks Lloyd, but by fixing the outer rim the part become much more rigid. I'm interested in seeing how much the shaft lifts and tips when different forces are applied to the rim.
    
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- Re: How do you restrain a model without influencing the results
  
  Dale Grossnickle Feb 1, 2016 12:28 PM (in response to James Riddell)
  
  Thanks James for your suggestion. I've read about the 'oft spring but have not been able to find it. I'm using SW 2014 so maybe it is not an option in this version??? I also tried creating a small feature on the face to apply a fixed restraint. It does allow me to complete the simulation, but the entire model gets pulled of center, which it not a true representation of the results. I will look into the inertial relief, have not heard of that one. Thanks again,
  
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  - Re: How do you restrain a model without influencing the results
    
    James Riddell Feb 1, 2016 12:48 PM (in response to Dale Grossnickle)
    
    Right click on "Static 1" in the lower left menu window and select "Properties". You have many options there.
    
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    - Re: How do you restrain a model without influencing the results
      
      Dale Grossnickle Feb 1, 2016 12:52 PM (in response to James Riddell)
      
      Got it...Thank you
      
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    - Re: How do you restrain a model without influencing the results
      
      Dale Grossnickle Feb 1, 2016 1:21 PM (in response to James Riddell)
      
      Thanks James, I checked the box Inertial Relief and Compute free body forces and WA-La
      
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