×
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

Jobs

Prestress for dynamic step

Prestress for dynamic step

Prestress for dynamic step

(OP)
Dear all,

For the simulation of Acoustic Emission (acoustic stress waves that form during crack growth), I am trying to prestress a model in Abaqus/Implicit, until the point where crack growth would occur. After this step, I restart the simulation with a Dynamic Explicit simulation, in which I release one of the boundary conditions at the crack tip. Although this works well, I do not have the computational capacity to run the Implicit simulation with the desired mesh resolution for the Explicit simulation.

I have tried replacing the static preload step with a quasi-static one (using Abaqus/Explicit), but still end up with very long computational times, because of the very fine mesh.

I also tried to perform the static preload step using a coarse mesh. Here I would load the model with a force, and extract the displacements for each node. With MATLAB I interpolate the results to a finer mesh, and generate a .inp file to run the dynamic simulation. When releasing these displacements, but not the load, the model obtains it prestressed state. This however also doesn't seem to work, because I need to apply displacements (in 3 directions) at every single node in the input file. It takes a very long time before the model is generated. (I am using " *boundary, _pickednode, dof,dof, value " for each nodal displacement).

Does anyone have a better solution than the ones I am trying? Or maybe there is a way to do the input of the interpolated displacements in a more efficent way? Any help would be very much appreciated!

Kind regards,
Ruben

RE: Prestress for dynamic step

Why do you do the transfer of the displacements with Matlab? Abaqus can do that directly with the Submodeling technique. I guess that's much easier and faster.

Abaqus USers Manual 10.2.1 Submodeling: overview

RE: Prestress for dynamic step

(OP)
I have just tried this, it indeed works far better. Thank you very much for your answer!

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!


Resources