Bolt Connection out of: RBE3 + CROD
Altair EmployeeHello,
what do you think of the idea to simulate a bolt connection of two holes with a specific stiffness made out of a RBE3 spider + CROD element + RBE3 spider?
The lenght of the CROD element represents the tolerance between the hole and the bolt.
Is the solution representative?
Answers
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Hello,
thank you for your reply. I know the RBE2 element is the usual way to define a bolt, but induces unwanted stresses in my model
In my model the bolt hole is deforming through thermal loads (like an oval if you amplify 100x). Through simulating the bolt with a RBE2 spider (even with CTE assigned), stresses are induced which are not valid in my opinion, because in reality the diameter of the bolt is smaller than the one of the hole - so in reality the hole can deform a little bit.
So the RBE2 spider does not allow the hole to deform. Thats why I want to use the RBE3 spider, then the center node is the dependent one (problem: center node has DOF 4/5/6). Now I am wondering, what element do I use for the connection between the two RBE3 spiders. As I understood I cant use an RBE2 element, which would be the most conservative, because then one center node is 2 times dependent and one is dependent and independet at the same time).
So I was thinking about the CROD element, which seems to be similar to a real bolt..
What do you think? Thank you
EDIT: Additionally I need to say: the material is ceramic, so the stiffness is higher than the one of the bolt. A RBE2 with indefinit stiffness as bolt is a problem.
EDIT2: As the CROD element can not be loaded perpendicular but axial it is useless for a bolt. Instead I did it like this: RBE3 spider, RBE2 element, CBUSH element (with super high stiffness), RBE2 element, RBE3 spider.
At least it can be loaded perpendicular now, but i am not sure about the stress validation..
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Use RBE3-CBAR-RBE3
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