×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

MPC RBE2 SOL400

MPC RBE2 SOL400

MPC RBE2 SOL400

(OP)
Hi! I am an engineering student and I am conducting a buckling analysis of a panel. All the nodes of the bottom side of the panel are fixed, I apply a forced displacement to all the nodes of the upper side of the panel and the analysis with SOL400 runs normally.

I want to create a Load/Displacement graph so I then tried to use RBE2 MPCs to apply the forced diplacement to one Node and constrain the movement of the nodes of the upper side in respect to that independent node so that I can measure the constraint forces on that node. Using RBE2 MPCs the analysis with SOL400 finishes but the results are problematic.

Is there a problem with the use of RBE2 with SOL400? Is there another way to measure the total constraint forces in order to create the Load/Displacement graph for the panel buckling?

RE: MPC RBE2 SOL400

Even if this is student post and this whole post will be deleted later, I want you to understand what you are doing. So copy paste it somewhere right away..
You most probably have all 6 degrees of freedom locked at your boundary nodes at the lower side of the panel.

On the upper side of the panel, you need to do the following for other cases;
1-) if all 6 degrees of freedom are locked at your boundary nodes at the lower side of the panel, to simulate a clamped condition at both 2 sides of your plate, you need to apply distributed forces on your upper side panel nodes (total of nodal forces will be equal to your total force - which you were applying to your RBE2 element earlier), and all upper node elements will be locked in the other 2 translational directions + 3 rotational directions (for clamped condition on 2 sides of the panel).
2-) for hinged conditions on 2 sides of the panel, you will do the exact same thing above. Only difference is you won't constrain rotational degrees of freedom.
3-) if you are trying to simulate buckling for 4 edge conditions (2 edges free 2 edges fixed, 4 edges fixed, 4 edges simply supported), you will need to see the answer for yourself by applying these conditions on square shaped panels and confirming those numbers with Bruhn buckling curves. But I'm guessing you won't need this part yet. 2 sides should be what you need for your elastic stability course.

I tried to outline in statement-3 your future cases too as it will be something you'll deal with if you become a structural/stress engineer, copy and paste this somewhere as your post will be deleted soon.

Spaceship!!
Aerospace Engineer, M.Sc. / Aircraft Stress Engineer

RE: MPC RBE2 SOL400

(OP)
Thank you very much for the help!

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

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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