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

one element different

one element different

one element different

Hi guys,

I've got a question on something I noticed after doing a calculation. When I look at the results in the contour plot at one location one element displays entirely different than the surrounding ones.

To make myself clearer: I have calculated a contact problem with friction. Then the stresses are displayed and at one spot there is an element that is for example blue (e.g. stress=10N/mm²) while the surrounding elements are red (e.g. stress=20N/mm²). How can that "jump" happen? Do I have to mesh my model finer?

Hope for an answer!

RE: one element different

Some kind of averageing method is used which you can alter. By default it's set at 75% but you can alter that to remove these apparent discontinuities. What the percentage refers to I'm not sure.


RE: one element different

With the default averaging scheme the results are not being averaged across between certain elements when the discontiuity is above a certain threshold (75% is the default). Therefore you see a jump in results.

There are many options for postprocessing in Viewer that you should explore. Have a look at the menu Results - Options (There's also an toolbox icon for this). You'll see you can turn off averaging, control the different regions used in the averaging and so on. There also an alternative whereby the order of compution of the scalars (before or after averaging) can be set. This will give people an option to make results look more like ABAQUS/POST (!). BTW if there are significant differences in the unaveraged, /POST-like and default /Viewer schemes then you've likely got a mesh that is not refined enough. There is no right or wrong in averaging schemes - it is, after all, averaging!

This is yet another compelling reason to look at the documentation. It is very complete, and will save you from having to say "I'm not sure". I don't believe non-linear FE analysts should ever be satisfied with an "I'm not sure" ;)

RE: one element different

Once upon a time you asked yourself the same question and read the book. However, once satisfying yourself with the explanation these matters tend to leave the mind until someone, someday, asks that same question, which rekindles that old memory. Unfortunately as the days pass and the memory gets filled with all kinds of junk, the exact transcript from the book eludes you and you can only give a partial, but hopefully helpful answer. Why I bother answering these questions "I'm not sure". Clearly the answer to every questioner is 'go read the book'.


RE: one element different

well thanx for your answers everybody!

RE: one element different

so corus Ihave read the "book" og abaqus documentation a couple of times now, but haven't quite gotten it wether to use hybrid elements for an elastomeric material or rather reduced integration elements. The material is subjected to shear forces, would that do some hourglassing effect, or does hourglassing only refer to bending shear??????

I can' get that quite clear.

Hope you can answer me that one too.


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


eBook - The Future of Product Development is Here
Looking to make the design and manufacturing of your products more agile? For engineering and manufacturing organizations, the need for digital transformation of product development processes just became more urgent than ever so we wanted to share an eBook that will help you build a practical roadmap for your journey. 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