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Equilibrium Check and Epsilon for model with contact and without contact

shaheer.iqbal
Hello I ran two models, one with contact and one without contact.
 
As part of model checking i check the epsilon value (round off error ). I noticed that the model with contacts does not produces epsilon value.
Can any one explain why is not writing the value?
 
Also, I noticed that my equilibrium checks are also not coming out to be zero.  
Attached are snapshot from equilibrium checks from both models. ​
 
How can I fix these errors ?
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  • 0
    You don't say what sort of contact type you're using or what solution sequence, but I'll assume you're using touching contact in SOL101.
     
    Remember that the contact algorithm for touching contact is fully nonlinear. Including nonlinearity in the model means that displacement does not necessarily equal force over stiffness any longer. Since that's the basis of the epsilon check, it therefore doesn't make sense to have the check when there's nonlinearity.
     
    Similarly, when the touching contact converges it's possible for additional forces or moments to be introduced, so some mismatch between applied load and constraint forces does not necessarily indicate a problem.
     
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  • 0
    You don't say what sort of contact type you're using or what solution sequence, but I'll assume you're using touching contact in SOL101.
     
    Remember that the contact algorithm for touching contact is fully nonlinear. Including nonlinearity in the model means that displacement does not necessarily equal force over stiffness any longer. Since that's the basis of the epsilon check, it therefore doesn't make sense to have the check when there's nonlinearity.
     
    Similarly, when the touching contact converges it's possible for additional forces or moments to be introduced, so some mismatch between applied load and constraint forces does not necessarily indicate a problem.
     
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