Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Postprocessing - Combining stress fields

Postprocessing - Combining stress fields

Postprocessing - Combining stress fields


I'm running a relatively straightforward plane-strain problem in ABAQUS 6.5, using CAE for all pre and post processing work.  I'd like to create a variable, which would essentially be the difference between S11 and S22, which I could then plot as a contour to compare to previously validated results.  

Does anyone know how to do this, only I'm getting nowhere fast....

Alternatively, if you can't do this in ABAQUS, is it possible to create output files with x, y, S11, S22 tabulated, as I could then read these into Tecplot and manipulate the results there to get what I want.

Hope someone can help



RE: Postprocessing - Combining stress fields


I suggest you use subroutine UVARM:

C Stress tensor:
      UVAR(1) = ARRAY(1) - ARRAY(2)

RE: Postprocessing - Combining stress fields

... you can just plot UVAR(1) in Viewer or print it in the .dat file like other variables.

RE: Postprocessing - Combining stress fields

Or, maybe you can output and read the S11 and S22 variables and do the difference by yourself using an external program.

RE: Postprocessing - Combining stress fields

Roshaz can read the model and results from an ascii Abaqus results .fil file and calculate and plot contours of any combination of the results like ABS(S11 - S22) very easily.

RE: Postprocessing - Combining stress fields

Thanks for all the replies.  To use the subroutine, UVARM, is there some option I have to set within CAE to make ABAQUS run this subroutine when running my job?



RE: Postprocessing - Combining stress fields

You can use Abaqus Scripting Interface to create new fields based on already existing (or not) fields. The new fields are stored in the .odb file, and you can perform any post-processing operation on them as for any requested fields.

The script is pretty simple. There are commands to create new scalar fields from components of tensor fields (S11 , S22 etc.)or tensor invariants. Then you can subtract the new created scalar fields.

Anyhow if you do not need to this operation often you can do it directly in CAE->Tools->Create Fields Output->From Fields->(select "Scalars" in "Function:" combo-box)->then create a new scalar field for each of S11 and S22, these will be stored in special created new step, called "Session Step". Now you can create new fields by performing operations on the new fields.

RE: Postprocessing - Combining stress fields

xerf, thanks - the method using CAE works a treat and has produced exactly what I wanted.  Now why can't the manuals explain it that well!!!



RE: Postprocessing - Combining stress fields


Seems that it is explained perfectly in section:
"24.5 Creating new field output"
of the CAE user's manual...

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - PLM and ERP: Their Respective Roles in Modern Manufacturing
Leading manufacturers are aligning their people, processes, and tools from initial product ideation through to field service. They do so by providing access to product and enterprise data in the context of each person’s domain expertise. However, it can be complicated and costly to unite engineering with the factory and supply chain. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close