×
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

Transforming Axisymmetric Results To 3D Model

Transforming Axisymmetric Results To 3D Model

Transforming Axisymmetric Results To 3D Model

(OP)
Dear Members,

I have an axisymmteric model that undergoes forming process. In this axisymmetric model, I have a rigid body and a deformable body. I can run the simulation and obtain the results.

The next thing that I want to do is to use the results from the axisymmetric model and transform it to 3D. This require some transformations. I have already looked at the keyword *Symmetric Model Generation and *SYMMETRIC RESULTS TRANSFER. The problem is my current axisymmetric model contains quadratic element (CAX8R) for the deformable body and linear element for the rigid body (RAX2). The symmetric keywords do not work with both elements (linear and quadratic at the same time). I have also tried changing the CAX8R to CAX4R and it works. However, this forming process involve significant bending and I prefer to use quadratic elements since it gives better approximations. This means I am still stuck.

So, do you have any suggestions to resolve this problem?

I know that it might be possible to create a script to transform the nodes from 2D (CAX8R) to 3D (C3D20R) but I require some guidance and example.

Cheers.

RE: Transforming Axisymmetric Results To 3D Model

(OP)
I have figured out how to do this. In case someone else wants to know how, here's how I do it:

1. Run the initial forming process.
2. Create a new model by importing only the deformable part from the ODB of previous completed simulation. Right-click on part --> import --> select odb file --> select the part and the final deformed shape
Also remember to also include predefined fields (e.g stress components from previous simulations). From the previous simulation, you can create XY report of stress components and include that in your new model. This step can be a bit tricky and you probably needs to play with the input file. What I do is to request the stress components from the centroid instead of the integration points. And for each element I also create a set. This way it'll be easier to assign the stress components of each element by defining it through set. There's also another options to define the stress states from ODB output file. But I'm not familiar with this option.
3. Just run a simple static case without any loading. The idea here is to assigned the stress components to the deformed part. It is also a good idea to make sure that you also deactivate the option to use parts and assemblies in input files. Model --> Edit Attributes --> Unclick the option to use parts and assemblies in input files
4. Once you've completed the job, just check the results (deformed shape and stress states). If everything seems good, you can start to transform the results into 3D using *Symmetric Model Generation and *Symmetric Result Transfer.

Let me know if there's another method of doing this.

Cheers and success!

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 - Design for Additive Manufacturing
With a growing number of parts manufactured directly by additive manufacturing techniques, it is important to lay down design principles suitable for such manufacturing processes and to ensure parts are designed for additive manufacturing. There are several factors that are to be considered at the design stage. Few such design issues in additive manufacturing are discussed in this paper. 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