Autodesk Simulation Mechanical and Multiphysics

[#1]

The surfaces in my model will not contact. I have tried selecting just the two faces, the whole parts, etc. I have done linear, nonlinear, and MES... I have no idea why they keeps passing through each other.

[#2]

You might upload the model for us to easilly investige it.

-Shoubing

[#3]

Ok I will as soon as I get a chance! Could it be because the part is not actually touching, just exaggerated to touch?

[#4]

It seems that the contact is not detected.  I am wondering whether the contact is well set up between the surface really in contact.

-Shoubing

[#5]

I have the same problem.

I'm working on a FEA of a climbing carabiner (oval-shaped; one side of the oval is a gate which opens and closes allowing a rope into the carabiner).

The gate of the 'biner has a hook which attaches to the "nose" of mainbody/biner.  However, this hook does not engage until the biner slightly deforms.

I've attempted to use the separation/no sliding contact option, but the solver behaves as if there is no contact occuring.  The nose simply passes right through the gate hook.

The initial gap of the system is about 0.040".  That means the nose must deflect 0.040" before the contact surface comes into play.

Any help would be greatly appreciated!

[#6]

Hi charsguo and isaacc,

I suggest that both of you create an archive of the models and attach them to the reply. It would make it much easier to find the probem.

See this thread for instructions on archiving.

[#7]

In Charlie's case, the analysis type was set to linear static stress. Contact only works in this analysis type when the gap/interference is 0. If the initial gaps are not critical to the design, I suggest that you remove them from the CAD model and start the process again. If the gap is critical to the design, then you must use an analysis type of "Nonlinear > MES". MES is the only analysis type that can handle surface contact between two surface with a gap.

For more information, see the page "Types of Contact" in the wikihelp. I will try to submit an update to the page to help make it clearer that contact requires a 0 gap in most situations.

[#8]

John,

This fixed my problem.  Many thanks!