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pre-stress and unions in Structural Mechanics
Posted 12 feb 2014, 12:21 GMT-5 Geometry, Parameters, Variables, & Functions, Structural Mechanics Version 4.4 0 Replies
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I'm trying to model a simple axysymmetric assembly that is joined with a bolt as you can see in the attached file.
But I'm worried about the pre-stress I'm introducing in the model. In spite of not saying anything to the program, if the different geometries are in contact with each other, the program understands that there is an union between them. But, how does it work?
I really don't understand what Comsol is doing in this cases. I know that there are pairs that we can define, but it seems that the program ties different geometries without saying anything.
I think that this is important just because I'm not able to control these unions, I cannot assign any stiffness value to the union or anything similar. And it directly affects to the stiffness of the assembly.
The pre-stress value that I should enter is in relation with this too, because if Comsol is considering a perfect union, it' s introducing a stiffness to ay model, and I'd be over-stressing it.
Can anybody help me with these question please?
Thanks a lot,
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Hello Inazio Mugica Etxebarria
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