Dear friends
There are two ways in Abaqus to achieve the buckling load in a model:
1-Linear perturbation-Buckle which is resulted the elastic buckling load of the system
2-static-Ricks which is resulted the inelastic buckling load if the plastic material properties are supported in data entry
The analysis with two mentioned methods shows different first shape modes.
please let me find your idea about the correct buckling shape?
The buckling load in Ricks method is a function of initial imperfection. in this way with different magnitude for different structural system there are various buckling loads. How these system performances are comparable?
thanks