Sheldon Imaoka
Ansys Employee
Hi srep123,nThe Ogden model is intended for nearly- or fully-incompressible materials. If you want the material to be fully incompressible, you would set d_i=0. However, if you have d_i values, you can enter those in, but just be aware of the unit system you have since d_i has units of 1/pressure, so you can get incorrect results if you used the wrong units.nOne item related to the Ogden model is that different sources define mu_i differently. Inquire your original source to check to see if they are using the same equations as Ansys (you can see the Ogden equation used in Ansys in the Materials Reference, Section 4.6).nRegards,nSheldo