4 Replies Latest reply on Aug 4, 2013 7:31 PM by Jared Conway

Check that you have applied adequate fixtures to stabilize the model

Daniel Kitts Aug 2, 2013 7:56 PM

I'm running a static analysis of a truss frame (created with beam weldments) with a large mass at the end. The large mass is modeled as a solid body. The only load I'm looking at is gravity, and I have the truss constrained on one end at specified joints. I'm getting this error (Check that you have applied adequate fixtures to stabilize the mode) after I mesh the model and try to run the solver.

I believe there may be something wrong with how I'm creating the contact between the beam components and the solid body (but I don't know how to check this). Is there a specific method to create contacts between solid bodies and beams?? I've applied "bonded" contacts with the beams to the face of the solid body.

Any ideas??

Re: Check that you have applied adequate fixtures to stabilize the model

Daniel Kitts Aug 2, 2013 8:19 PM (in response to Daniel Kitts)
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- Re: Check that you have applied adequate fixtures to stabilize the model
  
  Daniel Kitts Aug 2, 2013 8:31 PM (in response to Daniel Kitts)
  
  I think I figured it out. After applying the contact set between beams and solid mass, I redefined the fixted joints and it seemed to work correctly.
  
  However, got another funny thing happening. When I try to look at my stress plot, the entire truss component (beams) completely dissappears. Any ideas how to fix this??
  
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  - Re: Check that you have applied adequate fixtures to stabilize the model
    
    Mikael Martinsson Aug 4, 2013 12:48 PM (in response to Daniel Kitts)
    
    There are no von mises stress components for beams. You have to add a new stress plot. Since you have both solids and beams in your model you will have two checkboxes in the dialog to decide if you want beam or solid/surface stress plot.
    
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  - Re: Check that you have applied adequate fixtures to stabilize the model
    
    Jared Conway Aug 4, 2013 7:31 PM (in response to Daniel Kitts)
    
    Mikal nailed the output question.
    
    When trouble shooting, check out soft spring and also over restraining he model. Or the best method is to start simple. When you add something and get an error, you know exactly where the problem is. These are all things we teach in our training an one on one mentoring.
    
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