×
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

incompatibility between elements

incompatibility between elements

incompatibility between elements

(OP)
Hello,
I'm using the "coupled temperature-displacement" procedure for creep with two kinds of elements :

-C3D10MT

-C3D4T (where the Von Mises stress is low) to reduce the computing time.

My problem is that Abaqus gives me this error message :"the selected geometry order will introduce an incompatibility between the selected region and the neighboring region", which appears in the Warning too.

What are the consequences of this incompatibility on my results ?
Generally speaking, are the incompatibilities between elements a real problem ??

Thank you !

RE: incompatibility between elements

If there's incompatability then Abaqus will tie the two regions together. This will give some inconsistencies in the results along the bounding surface between the two regions as the displacements are interpolated between nodes. If this is well away from regions of interest then it shouldn't be of much concern but generally it's better to have a consistent mesh throughout. Personally I'd avoid using tetrahedral elements at all unless there was absolutely no way of being able to mesh the region with brick type elements in a reasonable amount of time.

RE: incompatibility between elements

(OP)
Thanks for the answer,

I know that linear tetrahedron are really too stiff, however with quadratics like C3D10M I get good results (but the computing time is high). Besides, i read that for plasticity and contact, the modified tetrahedral (and triangular) elements are better to avoid shear and volumetric locking.

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