2D Plane Stress in Workbench

[shaun8567]

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?

 

[flash3780]

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

 

[Kherszal9]

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.