Thanks for the response. nI do understand that my question is a bit general. However, I followed the experiment in terms of materials data and boundary conditions. I also do know that nonlinear FEA is an idealization of any lab test specially when it comes to boundary conditions and material models. I was thinking that the method I am following might have some drawbacks that are not mentioned in the manual and may be some experts have much more thorough understanding of these drawbacks. I also have seen a paper that modeled the same experiment and got the results validated. Therefore, I followed the same exact way along with all the data they assigned. I never got near the results they have which are very close to the actual test. Thanks againn