×
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

Abaqus contacts

Abaqus contacts

Abaqus contacts

(OP)
Hello,

greetings to all.

I'm very much desperate. I'm running out of time with my master thesis and I'm spinnin in circle with Abaqus contacts, so If someone can help, I would be very grateful.

I have something like 3 beams on each others, something like on the picture I'm uploading, which are in RL conected on 3 spots with bolts. Those spots I have connected with TIE (green lines on picture), but I have problems with touching surfaces during loading. They penetrate each other when they bend, of course smile

In the picture I've put plan and side view of those beams. Upper and lower beam are touching middle tangentially so i belive there lies my problem. I have tried surface to surface, node to surface, in every contact I've tried to switch master and slave surface, tried all kind of combinations with hard contact (which I use 'penalty' and not allowing separation after contact otherwise my simulation breaks). I also have define tangential component.

I have tried to partition each beam (like left and right side in plan view), and then define contact, but then i get error that surfaces intersect. I've tried with contact in initial step, in first, no changes. General contact do not help at all. It doesnt even recognize contact places.

currently I'm using C3D8I elements. I was told to use C3D20R, but my simulation breaks with them. With C3D20 it completes, but just like C3D8I, it penetrate in each other, but with longer running time. bigsmile

If someone have any idea, It would be awesome. Sorry for lumped thoughts.
Good day to all. :)



RE: Abaqus contacts

When you see large penetrations, then you should check these points:

- deformation scale factor in postprocessing
- penalty stiffness
- choice of master and slave
- mesh density

Without having the model it is hard to say anything more specific.


PS: In very complex contact situation it can be efficient to use A/Explicit instead of A/Standard.

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