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.
Ok I will as soon as I get a chance! Could it be because the part is not actually touching, just exaggerated to touch?
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
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!
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.
Hello Guys,
Could you please help? I am trying to analyse stresses in a spur gear during a complete rotation (i.e. 360 degrees). The pinion is rotating at a rate of 300 rpm and the main gear has a resisting torque of 225 in-lbs. The pinion and gear teeth pass through each other without making surface to surface contact. Even though I am running the analysis within a Mechanical Event Simulation environment.
I have tried various ways to create surface contact pairs by assigning them manually as well as automatically (i.e. all surfaces on part 1 to all surfaces on part 2) but they still fail to make contact. I have even extended the analysis time but that did not work.
I have spent many hours trying to diagnose what the problem is and I am beginning to think that the simulation cannot be done with this software. Is it possible? Can someone please help. I Cannot upload the ach file because of file size limitation on the forum. Please see attached jpeg file showing the gear teeth passing through each other. Thanks.
Hi Junior Brown,
It will be challenging to diagnose the model without having it. Did you read the thread "Create, Post, or Provide an Archive of your model" for tips on reducing the size of the archive?
Otherwise, here are some things to check:
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