×
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/Explicit - Contact Noise

ABAQUS/Explicit - Contact Noise

ABAQUS/Explicit - Contact Noise

(OP)
Hello people,

I'm a beginner in ABAQUS (learning since april) and I have a problem with contacts. I'm using surface-to-surface contact with two pieces, the one deformable being the slave and the other being the master. I'm always getting the warning "The slave surface nodes have much larger masses than the nodes on the master surface. Significant contact noise may result." I tried to modify mass-scaling , but it didn't work. I don't know if that's the cause of an oscillating kinetic energy and internal energy. I'm thinking of changing the master and slave surface, but it doesn't make sense with the tutorial of ABAQUS. I would very much like an insight...

Thanks in advance,

JuKnip

RE: ABAQUS/Explicit - Contact Noise

(OP)
I changed the surfaces master-slave, but it didn't change a thing. So, I really don't know how to decrease the noise or if it's the cause of the oscillation of the internal energy.

RE: ABAQUS/Explicit - Contact Noise

That sounds like a warning about the densities of the material properties not mass scaling. If you more clearly define the problem you are trying to solve we can help much more. Also, pictures or a model help greatly. I hope this helps.

Rob Stupplebeen
https://sites.google.com/site/robertkstupplebeen/

RE: ABAQUS/Explicit - Contact Noise

Try use a pure master-slave surface contact definition (with "weight" parameter). I think by default it uses a hybrid, i.e., 50% of each surface.

RE: ABAQUS/Explicit - Contact Noise

(OP)
Well, I'm modeling two pieces of the same material. The pieces are positioned so that one is inside of the other (There's a picture with one of the contacts highlighted). The actual problem is that when a uniform pressure is applied on the piece inside (like pushing it down), it slides to the base of the other.
I'm using pure master-slave contact with weight parameter by default. I have changed the mass-scaling and I'm using penalty for friction formulation.
And one question, is it normal for the internal energy to oscillate?
Thanks already for the replies =) (and sorry for the english)

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