×
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

2D Plane Stress in Workbench

2D Plane Stress in Workbench

2D Plane Stress in Workbench

(OP)
I'm currently using an evaluation license of ANSYS Workbench 14.5. I decided to try to do a Hertz contact stress problem of a rod in a vee-groove using 2D plane stress idealization and symmetry. The analysis properties were changed from 3D to 2D and geometry was created in DesignMolder. The image below shows the application of loads and constraints. A Frictionless contact has been set between the tangent edges.



A: A "Displacement" constraint is defined on the bottom edge of the vee-groove and has X = Free and Y = 0 mm.
B: A "Displacement" constraint is defined on the side edge of the vee-groove and has X = 0 mm and Y = Free.
C: A "Displacement" constraint is defined on the side edge of the ball and has X = 0 mm and Y = Free.
D: A "Force" of 30 N is applied to the side edge of the ball with a vector of <0,-1>.

When I run the analysis, I get two warnings stating that there is large deformation and that one body has experienced rigid body motion (the former resulting from the latter). When I animate the results, it shows the ball passing through the vee-groove, which suggests a problem with the contact definition. If I remove the force, adjust constraint A to have Y = 0.005 mm, and adjust constraint C to have Y = 0 mm, then I get the results that are expected.

I can't figure out what I am doing wrong here. Why would the function on the frictionless interface be dependent on the constraints applied to the geometry? Thoughts?

RE: 2D Plane Stress in Workbench

What sort of contact have you defined? Try incrementing the load more slowly to prevent your model from blowing through the contacts.

RE: 2D Plane Stress in Workbench

I have the same question as Flash - what kinds of contacts do you have defined? Depending on your problem, you may need the 'rigid body dynamics' package or an imported dynamics system for impact and contacts in ANSYS. Otherwise the elements used in the traditional structural elements were not meant to handle such interactions by design.

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