Showing results for 
Search instead for 
Do you mean 
Reply

Bilinear springs

Hi all,

 

I tried to model a bilinear spring which works only in tension in SOL 106. Therefore, I make use of a CBUSH collector and I define a Length-Force diagram in the PBUSHT dependent properties. However, the solution does not converge. When I perform the same model with a simple spring with a given stiffness, then the model works well.

 

Does anyone have any experience in modelling springs which only work in tension or compression?

 

Kind regards,

Evy

1 REPLY

Betreff: Bilinear springs

[ Edited ]

Hello Evy,

 

as no-one did answer you, I will try to support you.

First, if you already did find a solution, that would be great. Let's hear me, I'm very interested in.

Otherwise I try to help you finding answers.

 

1. What version of NX do you use?

 

2. Could you give me some explanations of your model like

- description of element types, (3D, 2D, ...)

- load and constraints and

- parameter settings for bilinear behavior of your CBUSH-element,

- TABLE definition and the entry where you did reference it.

- Is your CBUSH-element 0D or 1D?

- Did you define nominal values, too?

 

I think a set of pictures is the best way.

Please also provide a deformation plot of your "linear CBUSH-element" solution.

 

3. What kind of deformation do you expect?

 

4. Did you try GAP-elements or Contact-elements to get rid of your problems?

 

Best wishes, Michael