×
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

Midside nodes connected to corner nodes

Midside nodes connected to corner nodes

Midside nodes connected to corner nodes

(OP)
I'm not a Nastran user, but I'm looking at a plot of a Nastran model.  It's using 2D plane stress elements.  It appears that to go from a coarser to a finer mesh, there are corner nodes connected to midside nodes.  I always thought that was wrong.  Does it give good results?

RE: Midside nodes connected to corner nodes

While I've never done this myself, I have seen it done in the past.  It should be okay to connect larger 8-node plate elements to smaller 4-node plate elements using the midside nodes provided that you do not have any gaps along the interface.  This modeling technique may give you some slight variations in the stress field along the interface, but these errors should be minor.

This modeling technique is not valid if you are trying to connect larger 8-node plate elements to smaller 8-node plate elements using the midside nodes on the larger elements, as you will end up with gaps in your model.  

With either case, you should check for gaps with your pre/post processor.  This is done by running a coincident node check and then looking at the free edge display to see if you have any gaps.

pj

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