Hi folks!

I have a question. Is it possible to run modal analysis using prestress, calculated in nonlinear analysis?

For example, let's take a fishing rod. If we put fish at the end of it then the fishing rod will bend a lot and it's stiffness matrix will change. To accurately obtain modes of this deformed fishing rod we need both deformed shape and stiffness matrix and we can obtain these information only from a nonlinear solver.

Thank you for your help!