Hi,
The most fundamental problem in your model is that when you are using geometric nonlinearity, the strains are measured as Green-Lagrange Strains. The initial strains must be interpreted as such, so for your simple problem you would need to enter Y/R+0.5*(Y/R)^2.
You also have to be careful about how you define the radius and how you measure it. With your geometry the expected result of the max(x) evaluation is 73 (=R+t) and that is what you will get when you include the nonlinear term above. If you center your geometry around Y=0, then you will measure 71.5 (R+t/2) since you measure on the outside and not at the centerline.
Regards,
Henerik
The most fundamental problem in your model is that when you are using geometric nonlinearity, the strains are measured as Green-Lagrange Strains. The initial strains must be interpreted as such, so for your simple problem you would need to enter Y/R+0.5*(Y/R)^2.
You also have to be careful about how you define the radius and how you measure it. With your geometry the expected result of the max(x) evaluation is 73 (=R+t) and that is what you will get when you include the nonlinear term above. If you center your geometry around Y=0, then you will measure 71.5 (R+t/2) since you measure on the outside and not at the centerline.
Regards,
Henerik