simulation fem snode spherical

[Steppermotor]

Good afternoon to all.
I have encountered a problem simulating a spherical snout with solidworks simulation, I attach a screen of the problem with a very simplified set and in practice the problem is this:
the sphere is bound as fixed, the joint is coupled by tangency and in simulation has contact without comprenetation.
the force on the lever is 1000n only to amplify the shift.
simulating I would have expected him to report that the system is labile instead simulated perfectly by blowing the auction.
even putting friction at 0 in the connection the simulation is similar.
In fact, as we see from the stress the greater effort has the pin of the sphere that in practice should not do any work.
this is only a simplified example but in the simulation of the real group the results are similar and doing a critical analysis of the results we have convinced that this coupling takes us off the road with all the simulation.
Has anyone had similar experiences?
Thank you.

 

[meccanicamg]

simulate assemblies, contacts and what else is not always simple. I think the fems are only valid for single parts.
I think it is necessary to use a different type of coupling. There is a better analysis of the situation.
Are you doing a physical analysis? or a static fem? are two different things and are simulated in different environments.

 

[Onda]

How did you simulate the spherical snout? contacts? in this case make sure they were touching and not united.

 

[Steppermotor]

mating on the ball is a tangent but nothing changes even with a concentric. on simulation I set the coupling as non-competitive to friction 0.
the real case are two quadrilaterals connected with radial pins and bearings of which only one arm is a twin with two spherical snodes so as to be adjusted in length and possibly to compensate for failures. the case posted is just a simplification of the joint I used to figure out how to set calculation options.
are in accordance with mechanicalmg that the axieme is not the maximum for a fem.

 

[cacciatorino]

are in accordance with mechanicalmg that the axieme is not the maximum for a fem.

As long as you stay in the field of small shifts, you can also reason in terms of assemblies. for real cinemas no of course.

In your case, there's something wrong with setting constraints, which is then your error or software bug isn't easy to understand. is the force on the lever constantly oriented according to an axis in space or is it defined as normal to the surface of application?

Can you upload a deformed image with a strong amplification?

In any case, the solution was not to converge because the coupling is labile.

 

[Swarzy]

Hi.
something similar happened to me in the past as I had escaped some faces to define the local contact.

how did you define contact between faces, changing the global one or setting a local contact?

can you share the model with wetransfer?

 

[Steppermotor]

Sorry about the delay but I was on vacation... :
we noticed that even putting friction at zero always considers 0.05.
the project however went on with a normal bielletta without spherical knots as there was then no need to use them.
Thank you all for your instructions.