[ GiDlist ] Contact surface creation in GiD

[ASSANELLI Andrea CINI]

The procedure works OK, however I have to define contact between 2 surfaces
wich are originally separated (hence they cannot "exactly duplicate each
other"). Moreover the surfaces are not equal... A typical example would be
the contact between a sphere and a flat surface (in 2D), which are initially
separated, and will get in contact during the analysis, but the region of
contact is a function of the analysis itself (as in a Hertzian contact). One
surface would be a line (side) of the block, and the other an arc of the
sphere.

Again, thank you very much,

Andrea Assanelli
Senior Research Engineer
CINI/FUDETEC
Buenos Aires
ARGENTINA

-----Mensaje original-----
De: Ramon Ribó Rodríguez [mailto:ramsan at cimne.upc.es]
Enviado el: Viernes 8 de Septiembre de 2000 16:44
Para: gidlist at gatxan.cimne.upc.es
Asunto: Re: [ GiDlist ] Contact surface creation in GiD


Hello,

To create a 2D contact the process is:

- Create one side lines and put them in one layer.
- Set another layer as active
- Create another line that exactly duplicates the first one. Points
must
be also duplicated (Typically using copy with translation 0 and with
flag 'Duplicate entities' activated).
- Set another layer as active
- Create a contact surface selection the two lines or more at the same
time (if using copy, it has the option 'Create contacts').
- Several element types can be generated in the contact (degenerated
elements):
* 2-noded elements (by defalult).
* No elements (useful to force the same mesh in both sides)
* Quadrilateral elements
- Layer in this process have only been set for viewing and selecting
purposes. In fact, they are not necessary.

If 2-noded elements are meshed, later it is easy in the .bas file to
list
them by pairs.

Hope it helps,

On Tue, 05 Sep 2000, you wrote:
Hi, I am using GiD (v5.0 p47) as a pre-processor for an in-house FE
program.
I am modelling a 2D problem in which 2 bodies are expected to get in
contact
during the analysis, but are intially separated or with interference
(overlapping). The two bodies are defined as planar surfaces bounded by
lines, polylines and arcs.

I can create correctly the surfaces and its meshes. However, when I want
to
create contact surfaces (using Geometry-Create-Contact-Surface) the
contact surfaces are not created: after selecting a series of lines I
obtain
the message "Created 0 new contact surfaces. Can continue (ESC to leave)".
What I really need is the list of nodes for the lines that I will define
as
my contact surfaces, ordered by pairs (target-contactor). I will have
tipically 25/30 contact pairs (target-contactor) per analysis, and I would
prefer to generate this information automatically, and not going to the
specfied surfaces AFTER the meshing and listing the nodes. Is this
possible?

Thank you very much,

Andrea Assanelli
Senior Research Engineer
CINI/FUDETEC
Buenos Aires
ARGENTINA
--
Centre Internacional de Mètodes Dr. Ramon Ribó
Numèrics en Enginyeria
http://gid.cimne.upc.es/ramsan ramsan at cimne.upc.es
C/ Gran Capitan s/n,
Modulo C1, Campus Norte UPC, tel. +34 93 401 74 03
E-08034 Barcelona, Spain fax. +34 93 401 65 17

[M. A.Meguid]

I am doing some numerical modelling that involves excavation process and
looking for any way that could allow removing some elements
(the excavated ones) after running the solver, so that the postprocessor
will only plot the final mesh after excavation.

Anybody's help is appreciated

M. A. Meguid

[M. A.Meguid]

I am doing some numerical modeling that involves excavation process and
looking for any way that could allow removing some elements
(the excavated ones) after running the solver, so that the postprocessor
will only plot the final mesh after excavation.

Anybody's help is appreciated

M. A. Meguid

----- Original Message -----
From: "M. A.Meguid" maabdel at engga.uwo.ca
To: gidlist at gatxan.cimne.upc.es
Sent: Tuesday, September 12, 2000 11:04 AM
Subject: Re: [ GiDlist ] Excavation


I am doing some numerical modelling that involves excavation process and
looking for any way that could allow removing some elements
(the excavated ones) after running the solver, so that the postprocessor
will only plot the final mesh after excavation.

Anybody's help is appreciated

M. A. Meguid

[Miguel A. de Riera Pasenau]

"M. A.Meguid" wrote:

I am doing some numerical modeling that involves excavation process and
looking for any way that could allow removing some elements
(the excavated ones) after running the solver, so that the postprocessor
will only plot the final mesh after excavation.

Anybody's help is appreciated

M. A. Meguid


Can you elaborate on this?

There are several tools to remove elements, at preprocess level
"Meshing-Edit Mesh-Delete elements" and at postprocess you can
divide the mesh, . . .

--
--------------------------------------------------------------------------------
Miguel A. de Riera Pasenau miguel at cimne.upc.es http://gid.cimne.upc.es

[M. A. Meguid]

Thank you sir for your concern.
I am talking about the post process,(i.e. after running the solver)
I have to do the analysis first with the complete mesh defined and defining
the elements to be removed in the pre-process stage. which is straight
forward

The problem now with the post-process stage where I need to take the
excavated elements off the mesh before plotting the results.

Regards

All I need is some tool that re
----- Original Message -----
From: "Miguel A. de Riera Pasenau" miguel at cimne.upc.es
To: gidlist at gatxan.cimne.upc.es
Sent: Friday, September 22, 2000 7:29 AM
Subject: Re: [ GiDlist ] Excavation(again)


"M. A.Meguid" wrote:

I am doing some numerical modeling that involves excavation process and
looking for any way that could allow removing some elements
(the excavated ones) after running the solver, so that the
postprocessor
will only plot the final mesh after excavation.

Anybody's help is appreciated

M. A. Meguid


Can you elaborate on this?

There are several tools to remove elements, at preprocess level
"Meshing-Edit Mesh-Delete elements" and at postprocess you can
divide the mesh, . . .

--
--------------------------------------------------------------------------
------
Miguel A. de Riera Pasenau miguel at cimne.upc.es
http://gid.cimne.upc.es

[Miguel A. de Riera Pasenau]

"M. A. Meguid" wrote:

Thank you sir for your concern.
I am talking about the post process,(i.e. after running the solver)
I have to do the analysis first with the complete mesh defined and defining
the elements to be removed in the pre-process stage. which is straight
forward

The problem now with the post-process stage where I need to take the
excavated elements off the mesh before plotting the results.

Regards

All I need is some tool that re
^^^^- seems to be cut

The only tool in postprocess to remove elements is to divide the mesh:
entering a plane conservate the elements at one side of the plane.

You can also delete meshes/sets individually.

hope it helps.

best redagrs
miguel



--
--------------------------------------------------------------------------------
Miguel A. de Riera Pasenau miguel at cimne.upc.es http://gid.cimne.upc.es