×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Can SDVINI Subroutine achieve my ideas: change the direction of the load based on the results?

Can SDVINI Subroutine achieve my ideas: change the direction of the load based on the results?

Can SDVINI Subroutine achieve my ideas: change the direction of the load based on the results?

(OP)
I am a beginner of Abaqus Subroutine. My research needs to change the direction of the load based on the results of the simulation.

For example, such a loop
if b>0.3 or b<0.2
change direction α
until 0.2<b<0.3
end if

Can SDVINI Subroutine achieve my ideas?
Anyone can send me an example of SDVINI Subroutine?

RE: Can SDVINI Subroutine achieve my ideas: change the direction of the load based on the results?

Do you want to change the load direction during the analysis? Or for the second analysis based on a previous result?

I guess option one. Then a SDVINI would not would, since it is only called at the beginning of the analysis.
I would recommend to define one load in each direction and scale them during the analysis with an UAMP subroutine. A UAMP allows to access current history output (marked as Sensor), so you can define the next load scale factor. With a proper scaling of the loads you can get any direction you want.

RE: Can SDVINI Subroutine achieve my ideas: change the direction of the load based on the results?

(OP)
@Mustaine3 thank you for your reply.Actually I mean “for the second analysis based on a previous result” Do you have any suggestions? Thanks in advance.

RE: Can SDVINI Subroutine achieve my ideas: change the direction of the load based on the results?

So, if I understand it correctly, you want to repeat the same simulation changing only load definition until you will get desired results (for example displacements or stresses in specific range), right ? This problem does not require the use of Fortran user subroutine but rather Python scripting or Isight.

RE: Can SDVINI Subroutine achieve my ideas: change the direction of the load based on the results?

(OP)
@FEA way Yes, you understood me correctly. I have tried to generate boundary conditions for thousands of angles through Python Script and calculate the values I need. Is that what you think? Could you please give any tips about Python script and Isight to solve this problem?

RE: Can SDVINI Subroutine achieve my ideas: change the direction of the load based on the results?

Isight is an external software for simulation process automation. You will need additional license for it. In this software you can create a simple loop to run a simulation, read results from output database, run the simulation again with different load, read results and repeat the process until the output values will be in specified range.

However this should also be possible using Python scripts. You would have to combine the following capabilities of Abaqus scripts:
- opening output database and reading specific results
- editing input file to change load definition
- submitting a job

The rest is just a simple loop.

I think that the book „Python Scripts for Abaqus. Learn by Example” by G. Puri could be helpful for you.

RE: Can SDVINI Subroutine achieve my ideas: change the direction of the load based on the results?

If I may add something...

Today most companies have the Abaqus Extended License, which also include the tools Isight, Tosca and fe-safe. So check this first.
But in my opinion the problem can hardly be solved with parametric optimization or a DOE (Isight can do both, as well as simple loops). In my opinion the solution has too many possibilities (every load direction is an input variable and every stress(?) is an output variable), so parametric optimization would need huge number of runs to solve it.
A parametric-free optimization tool like Tosca would be more efficient, but in those tools the methods are hardwired, so you can't use them for any problem you want. Tosca allows to do topology-, sizing-, bead- and shape optimization.

Maybe the Design Sensitivity Analysis (DSA) that is included in Abaqus is the next best thing to look at. It uses sensitivities (a bit like Tosca), but has a more open framework. Search for it in the Abaqus documentation. There are also examples in the the Example Problems section of the documentation.

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


Resources

White Paper - Addressing Tooling and Casting Requirements at the Design Stage
Several of the tooling and casting requirements of a part can be addressed at the design stage. If these requirements are not addressed at the design stage, lot of time is spent in design iteration when the design reaches the die caster. These design issues lead to increase in time and cost of production leading to delay in time to market and reduced profits for the organization. Download Now
White Paper - The Other Side of Design for Assembly
Assembly level constraints need to be satisfied before the design can move downstream. This white paper will go through the various assembly level issues, which need to be tackled by various organizations on a regular basis. Know more about DFMPro, a design for assembly software. 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