Contact elements internally are like the rest of standard elements.
You can ask them from the .bas file with *elemsnum, *elemsconec, etc.
Maybe you can difference them by the type of the element (e.g. your main mesh have triangles, and the contact are cuadrilaterals, or line elements)
You can also use some additional condition to mark them, or separate by layers.
----- Original Message -----
From: Rodrigo Augusto
To: gidlist at gid.cimne.upc.edu
Sent: Tuesday, February 10, 2009 5:30 PM
Subject: Re: [GiDlist] Crete a segment-segment contact element
Thanks Enrique,
One more information. I need to know what is the GiD tcl command used to return the information about the GiD contact elements.With GiD discretization (one-to-one relationship) it is possible to use my algorithm developed, because I am using the segment-segment discretization for matching mesh with infinitesimal deformation.
Best Regards
2009/2/10 Enrique Escolano escolano at cimne.upc.edu
I fdon’t know how are the ‘Ansys contact elements’ that you want to use.
I’m not an Ansys user, but I think that there are several kind of contacts:
- nodes against nodes or against element faces
- explicitly classified or not in two groups: source and target (master/slave)
- with relationship one-to-one between contact nodes
‘GiD contact elements’ are only necessary if you need a one-to-one node relationship, and also they aid to identity pairs of contacting nodes
(nodes connected by the extra cuadrilateral or line element of the contact entity)
Another approach alternative to the ‘GiD contact elements’, where is necessary to have coincident lines/surfaces (unfriendly) is to use the “Mesh criteria-Duplicate”, then you can
have a single geometric entity and assign this meshing criteria to obtain “duplicated” contact nodes.
Probably instead the ‘GiD contact entities’ you can use some condition to mark nodes, body elements or face elements and if necessary set a field to say if it’s “source” or “target” (and contact parameters, like friction coefficients, etc)
Regards
Enrique Escolano
----- Original Message -----
From: Rodrigo Augusto
To: gidlist at gid.cimne.upc.edu
Sent: Tuesday, February 10, 2009 1:31 PM
Subject: [GiDlist] Crete a segment-segment contact element
Hi,
I want to know if there is a way to create a segment-segment discretization in 2d contact problem and a surface-surface discretization in 3D contact problem in the same way that ANSYS generates its contact elements. In Gid when I have two coincident linesand create a contact surface the meshing process generated a 4node planar quadrilateral, where two nodes belongs for ones body and the others two for the other body. I want to split this information in the context of target and contactor elements. How can I do this?
Best Regards
–
Rodrigo Alves Augusto
\
Rodrigo Alves Augusto
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