Extract Model Geometry from Customized Orphan Mesh

[MechEngr81]

Hello

I have a modified .inp Abaqus file which creates a customized (particular numbering order) mesh grid without making the model geometry in abaqus/cae. When I import this file into Abaqus, I get the following error: "WARNING: Empty part PART-1. This occurred while reading keyword options within part definition." which implies the model geometry is not defined. There is only Orphan Mesh, however no mdb file exists to extract the geometry out of. I wonder if there is a way to deal with this issue? Is it possible to somehow include the geometry definition into the inp file?

Please help.

Thank you

 

[mechfeeney]

open your .inp in a text editor (such as Notepad) and check the part definition. it should have the keyword *part and a matrix of Node #'s, X, Y, and Z coordinates. Here is an example:

*Heading
**Job Name: Job-1.inp
** Generated by: Abaqus/CAE 6.10-2
**Author: Bob
*Preprint, echo=NO, model=NO, history=NO, contact=NO
**
**
*Part, name=Part-1
*Node, nset=NODES
1,0.86603,1.5,12.5
2,1.3527,1.425,12.117
3,1.8394,1.35,11.733
4,2.3261,1.275,11.35
5,2.8128,1.2,10.966
6,3.2995,1.125,10.583
...
...(More Nodes...but you get the idea)

*Element, type=B31, elset=Elements
1,1,2
2,2,3
3,3,4
4,4,5
5,5,6
6,6,7
7,7,8
...
...(More Elements...but you get the idea)

*Beam Section, elset=Elements, material=material-1, poisson = 0.3, temperature=GRADIENTS, section=PIPE
0.05000, 0.00300
0.,0.,1.
*end part

 

[MechEngr81]

@ Mechfeeney: Thanks for your reply, but I have already defined the nodes/elements set as well as section and material properties in the inp file. I can see the (orphan) mesh as I import the .inp file, but I can not submit the job since there is no model geometry defined. I guess there should be a way to extract the geometry or convert the mesh into. Can you advise me?

Thank you

 

[mechfeeney]

Could you attach a sample portion of your .inp? Typically, orphan meshes are extracted from an .odb. In other words, one would run a .inp file of a defined part. This generates a .odb of containing the deformed geometry. Then one can extract the deformed geometry from the using PartFromOdb python command (or with the export feature in the CAE). I guess I'm a bit confused about what exactly you are trying to do. A sample portion of your .inp would probably help.

 

[mechfeeney]

By definition, an orphan mesh contains no geometry. Check this thread out

http://eng-tips.com/viewthread.cfm?qid=117932

 

[MechEngr81]

Hi mechfeeney

I attached my .inp file. All of the nodes/elements specs are obtained according to the geometry, but like I said, I don't want to deal with visualization cae module since the model geometrical size is frequently changed. So, I wonder if I can somehow control the inp file and run the simulation or can I control the input dimensions in the cae without drawing the part each time?

Thank you much

Link to the file:

http://files.engineering.com/getfil...4035-b8e4-5da4f1f3ee8e&file=MyModel-Forum.inp

 

[mechfeeney]

There is nothing under your part head *part. It says:

*Part, name=MyPart
*End Part

It needs to be
*Part, name=MyPart
*Node
(All your nodes)
*Element
(All your elements)

etc etc.

 

[MechEngr81]

Thanks for catching that. Should the *part body also include Instance and Section set definition in addition to Nodes and Element?

 

[mechfeeney]

Here is an example .inp that I created by hand (I made it in Matlab) this is the proper format for a wireframe truss structure.

 

[mechfeeney]

sorry here*

 

[mechfeeney]

I think you need to start over your explanation about what you want to do. For instance:

1. I want to model blah blah blah
2. I have made the model in the visual CAE
3. I have the .inp after running the job in the CAE
etc etc

Right now you are explaining things in the middle of a jumbled mess...and I can't really help you all that much without some clear background information and a list of clear goals.