Hello Everyone , I am performing a buckling analysis on laminated composites shells.
The load I am getting in Non Linear Riks method is greater than the Eigen Value Load . Can someone help me with that?
I have used an imperfection of 50% of thickness of the shell.
LPF is converging at 1.29 value , as you know that Non linear buckling load is given by following,
Non Linear Bulking Load= LPF*Applied Load
So, after multiplying LPF with the applied load it exceeds the first eigen value buckling load.
You can try the Newton-Raphson method with artificial damping as alternative. We have carried out a lot of buckling analyses with this solver and also validated through the buckling tests. You can find the solver parameters we used in my papers
Did you find a solution for your problem because i am facing the same problem during doing the analysis ?
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