Non Linear analysis of a Ring

[jaisonj]

I am relatively new to Ansys non linear analysis. Here I have a problem where I need help to model and solve in Ansys. There is a big ring with 4 m OD and 3.5 m ID with a thickness of 0.4 m. on this ring I want to create a permanent deformation of around 50 mm by compressing at diametrically opposite points. I tried defining non linear material but still could not produce any “equivalent plastic strain” with any load.

I am using Ansys Workbench 11. Can some one please help me to define a non linear material properly and do the appropriate analysis settings?

 

[qwicker]

What is the ring made out of? Depending on the material, you need to select an appropriate material mode. Also, does the material model NEED to be nonlinear?

 

[JCrash]

What's non-linear about your material? Are you trying to model an elastic/plastic curve? Or just do a elastic/perfectly plastic analysis?

For steel, the simplest option would be to add Bilinear Isotropic Hardening to the material, insert the yield and a tangent.

 

[Stringmaker]

Your question is a Mechanics of Materials problem and has an analytical solution which seems would be an easier route to take. Look in a good Applied Mechanics book which has a section on ring or disk theory. Should be straight forward so long as you know the constitutive relations for your material.