help for analysis fem

[LucaNavale]

Good morning to all,
I am a master student of naval engineering, I recently started using creo 2.0 and I would need a more experienced hand like yours.

I started modeling a chain of anchors for the purpose of studying then what happens in terms of fem analysis to one of the rings.
after assembling 3 rings, I started the analysis by setting as a constraint the snap on the upper ring and as a force a f=5000 n on the lower ring, in order to study what happens to the ring in the middle (in a chain of 3 rings).
I've always been wrong with the analysis and I can't handle it. I now attach the pictures.
Can you help me?
Thank you.
p.s. I set steel for all 3 rings.

 

[320i S]

the error that gives you, is quite clear, that is the axieme is not completely bound, for the analysis is all mobile.
already in the first picture you have a set where all plans are lacking (but not fundamental), but above all the coordinate center, on which to fix the first ring.
also known by the square on the icon of the parts in the model tree.

then first of all, create default plans and coordinate system before assembling the first ring, the first ring assemblies it by default constraints and then others.

 

[PierArg]

Of course it makes a mistake, it's all labile.
but then, what's the point of simulating 3 rings when you can safely simulate one and replace others with forces?

 

[LucaNavale]

Good evening, thank you for the answers.
the fact that it was all labile I considered it, and I tried to solve it by inserting other constraints but in the end it always gave me the same mistake.
As for the 3 rings, it is much easier to consider only one, but I can't, and I ask you a solution, to insert the tapering constraints and the force applied only in a portion (the contact between the rings) of the surface. the two extremities are: or all the upper/lower part of the ring or a point.
waiting for your clarification I will begin to follow the recommended road from 320i s.
grazie

 

[LucaNavale]

Good evening. pirurgI have reflected a little, and indeed I can very well schematize the load and the bond with a single point, being the chain built so that the attack (with the previous and next mesh) is thoughtable as a point of contact between 2 orthogonal cylinders, which therefore turns out to be a single point.
I therefore tried to do the analysis considering one mesh of the chain and therefore applying the bond and force in one point.
I would need clarification as the analysis still can't carry out.
I attach images.grazie.