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Creating a SID_FEM with Abaqus

Creating a SID_FEM with Abaqus

Creating a SID_FEM with Abaqus

(OP)
Hello everybody,

At this time I am trying to change a .SIM file into a .SID_FEM file with Abaqus. I need this type of file to simulate structures in Modelica. I hope there is somebody on this forum that has experience with this.

I tried two different methods to create those .SID_FEM, but until now I didn´t have any luck.

1. The first method is with the cmd prompt. First I should write in the input file ",FLEXIBLE BODY=S" next to *SUBSTRUCTURE GENERATE. Then I should write "abaqus tosid -job <jobName>" in the command prompt. Unfortunately I get the error "Abaqus Error: Command line option "tosid" may not be used with "analysis" every time. Am i getting this error because I am using the 2019 Student Version of Abaqus Or is there another mistake i am not noticing? I have included my input file to this post.

2. I have also tried writing the line "*FLEXIBLE BODY, TYPE=SID" in the SUBSTRUCTURE part of my input file. This method is decribed at: http://bobcat.nus.edu.sg:2080/English/SIMACAEANLRe.... In the corresponding paragraph is actually written that the SID data is saved in the .SIM file of the substructure. The data should then still be written to a new .SID_FEM file with a program. Maybe this could still be possible with another feature of Abaqus I don´t know about yet?

Thanks and have a good day!

RE: Creating a SID_FEM with Abaqus

Use the following keywords in the input file:

*Step
*Substructure Generate, mass matrix=yes, recovery matrix=yes
...
*Flexible Body, type=SID
...
*End Step

In the command line interface you have to use: abq tosid -job <jobName>

RE: Creating a SID_FEM with Abaqus

(OP)
Thanks for your quick reaction. I tried out quite a few things but so far nothing is working.

I have the feeling that the problem could be caused by three different things:
- using the CMD Prompt/ Abaqus in a wrong way
- Having the Student version that is not allowing me to use the "abq tosid -job <jobName>" command
- having errors in my Input file.

I have included a picture of the error messages I get in the cmd prompt and the error I get when using the Command Line Interface in Abaqus/CAE.
Also I have copied the substructure generation part of my Input File to this post to check if it is right.

Can somebody recognize which mistake i am making?



*** Part of the Input file: ***
**
** STEP: Step-1
**
*Step, name=Step-1, nlgeom=NO
*Substructure Generate, overwrite, type=Z1, mass matrix=yes, recovery matrix=YES
*Flexible Body, type=SID
*Damping Controls, structural=COMBINED, viscous=COMBINED
*Retained Nodal Dofs
SIDENODES, 1, 3
*End Step

RE: Creating a SID_FEM with Abaqus

It's possible that student version can't do this but first I would make sure that the specified name of the job in this command (job_Z1) is exactly the same as the one of .sim file. Also try the following syntax:

abq2019 tosid job=job_Z1

If you installed any hot fixes the first part might be different (for example abq2019hf4 in case of Abaqus with installed Hot Fix 4).

RE: Creating a SID_FEM with Abaqus

(OP)
i finally managed to create the .SID file. I discovered that the student version does not support tosid. Also the command abq turns out to be an old command.
What worked for in the end me was using "abaqus tosid job=job_name" in the cmd window while using an official version of Abaqus.
The job_name file has to be a .SIM file of a substructure and has a name like job_Z1.sim.
To find out which command you need you could look in the folder: C:\SIMULIA\Commands and then the name of one of the files there should work.

Thanks for the help!

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