How much gap between parts in assembly?
How much gap between parts in assembly?
(OP)
Hello all,
I am working on the assembly with different parts. I know this is the contact nonlinear problem. What is the amount of the gap need to be in order to model the real case? I know the gap will strongly affect the contact pressure between parts. The problem is not press-fit, should I use the tolerance in the design to put into FEA? Thanks for help.
I am working on the assembly with different parts. I know this is the contact nonlinear problem. What is the amount of the gap need to be in order to model the real case? I know the gap will strongly affect the contact pressure between parts. The problem is not press-fit, should I use the tolerance in the design to put into FEA? Thanks for help.





RE: How much gap between parts in assembly?
corus
RE: How much gap between parts in assembly?
Thanks for your quick response. I am quite curious if I make two parts contact with each other, do the auto-meshing mesh the whole parts together, like one parts, instead of two parts. Just like two parts welded together. Of course, I know, I need to define the "slave" and "master" contact surface, tangential behavior, frictionless, sliding formulation options!
The option that you mentioned is "slave node adjustment"?
RE: How much gap between parts in assembly?
The slave node adjustment is the option to move nodes to be touching, initially. Be careful with this though, as if you have a gap then the model will be distorted as the nodes from the slave surface are moved to the master surface. Too big a gap and you can get odd results or even the job failing due to element distortion.
corus
RE: How much gap between parts in assembly?
RE: How much gap between parts in assembly?
If you had a beam resting on three supports , ie. one support was redundant, then you cannot guarantee that all three supports are in contact. For a case like that I might consider the worst case of only having two supports for a design case scenario.
corus