esys-escript

implement a frictional boundary

Asked by ceguo on 2014-01-03

Hi all,

Is it possible to set a frictional boundary in escript, e.g. using contact element? It's kind of interaction problem. The boundary DOFs are not fixed, but will be mobilized when the shear force exceeds some threshold.

Ning

Question information

Language:: English Edit question

Status:: Solved

For:: esys-escript Edit question

Assignee:: No assignee Edit question

Solved by:: Lutz Gross

Solved:: 2014-01-13

Last query:: 2014-01-13

Last reply:: 2014-01-10

Link existing bug

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Lutz Gross (l-gross) said on 2014-01-04:

What is the context? Are you solving the wave equation?

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ceguo (hhh-guo) said on 2014-01-04:

I'm solving a mechanical problem actually. Similar to the Lame equation in escript.

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Lutz Gross (l-gross) said on 2014-01-04:

Do you have a condition of the form: n.signma=a+min(s0,D*u)
where u is the unknown diplacement (or velocity) on the surface (a, s0,D given) ?

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ceguo (hhh-guo) said on 2014-01-05:

I don't know much about how usually FEM treats a contact problem. But I think the form is something similar to yours. I assume my domain is in contact with a flat rigid frictional surface with frictional coefficient \mu. So the boundary condition is something like:
tangential force <= normal force x \mu