×
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

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

Research Report - What’s the State of Nonlinear Simulation?
Simulation is an increasingly valuable tool across the product design workflow, but not all simulations are equal. We set out to determine how engineers and product designers make use of specialized analyses, how they incorporate nonlinear simulation into their work and how they rate the available software. Download Now
White Paper – Data Security and Know-How Protection
Our data is constantly exposed to the danger of being intercepted or stolen as it wends its way over global data networks. Data security measures and measures for protecting intellectual property should not, however, first be implemented when data is exchanged – companies must lay the foundation for these measures within their own organization. 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