×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

*
*
*
*

Thanks. We have received your request and will respond promptly.

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

How to Constrain Hollow Tube under Thermal Expansion

thread828-131875

How to Constrain Hollow Tube under Thermal Expansion

How to Constrain Hollow Tube under Thermal Expansion

(OP)
When applying a global thermal load to a hollow tube, the tube wants to expand radially so how do you constrain the tube without restraining the expansion.

I'm simulating a tube under pressure and temperature and fixed at both ends, but if I fix both ends I get extremely high stresses at the ends.  The tube has been idealized as a shell.

KL

RE: How to Constrain Hollow Tube under Thermal Expansion

KL,

I recommend using a cylindrical coordinate system at each end. Use this local coordinate system to create the constraints in the z direction only at each end. This will allow for the radial direction to be left free. Be careful not to under constrain your entire model, however, you may need at least one point to have a fixed radial DOF. Always check your constraints for near zero reaction loads to ensure your model is in static equilibrium.

Best regards,

Matthew Ian Loew


Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

RE: How to Constrain Hollow Tube under Thermal Expansion

(OP)
Thanks Matthew.  How do u add cylindrical coordinate in Wildfire?

KL

RE: How to Constrain Hollow Tube under Thermal Expansion

I don't have MECHANICA open in front of me now, but you should be able to just add a coordinate system of that type. Use the help functionality for specific questions like that.

Best regards,

Matthew Ian Loew


Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

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