I am relatively new at using FEM software, and I have doubts regarding how to set the contacts between two solids that are joint by bolts. Here you can see the model (v7.1):
I have done it by myself but not sure it is correct.
Is it valid to create one contact constraint for all individual bolts (as I did, one for bolt-cylinder and other for bolt-frame) or I need to create an individual constraint for each one
Also do I need to split the exterior surface of the bolt so I can select only the side which is implicated in each contact?
About the mesh, is it over-meshed? I wonder If a coarser mesh would be enough
Can you please check the whole model to find incoherences? (for example, it seems weird to me the way the supports are set up, as I need to specify the point by coordinates)
Let me just give you some small tips on your questions as nobody could answer so far
I would recommend creating a master-slave assignment for each individual contact!
Splitting surfaces makes sense especially when you need to define a separate boundary condition.
Looks like a good mesh to me. I would start with a coarse mesh always and do a convergence study to see the effect on the results.
Looks good to me so far. You need to define the coordinates as you are using the remote displacement boundary condition. You could also work with a fixed support or a displacement boundary condition setting the lower part encastré. My colleague @rszoeke created a nice post for this issue a while ago: Remote Displacement BC.
Well, the results are negative. It seems that this joint setup is not strong enough. However, I did the bolt checking following Eurocode and results were quite safety. Just in case anyone wants to take a look here it is:
Thank you for sharing your project. In your bonded contact between frame and bolt, why did you select for the slave surface, only half of the circumferential area on the bolt whereas you selected all the circumferential area on the frame
here it is: