×
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

Contact problems

Contact problems

Contact problems

(OP)
I'm trying to solve a very simple problem in Abaqus as a step towards validating and creating the far more complicated model I need to solve.

I have two perpendicular half cylinders, they are each 1000mm long with a radius of 250mm. A fixed constraint is applied to the base of one cylinder. A concentrated load is applied to the centre of the top of the second cylinder and zero displacement in any direction but the load direction constraints applied to the end faces. At the contact area the mesh sizing is 0.2mm which from my hand calculations should give 20 elements over the contact patch. The analysis is Static, General and the contact is set to not adjust the nodes and to attempt 3D smoothing when applicable.

However the results I am obtaining give a point contact with 1405GPa maximum contact pressure which is significantly in excess of what my hand calculations predicted.

RE: Contact problems

Your unit system does not fit. You model dimension is in mm, but your material data seem to be in m.

The radius of the cylinders is 150mm instead of 250mm.

RE: Contact problems

(OP)
Yeah lets call the radii a typo not me failing to double check the word document where I had this all written down.

I'll correct the Young's modulus and density when I go back to work tomorrow. For a 8000kg/m3 density in to consistent units it would be 8e-3 tonne/mm3?

RE: Contact problems

(OP)
Thank you.

Changing to consistent units is now giving the right stress and contact pressure distributions.

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