nGetting a structure with an applied pressure to show post-buckled results is challenging. Get ready for days (weeks?) of research. One requirement is to introduce some tiny amount of non-uniformity into the model to seed the buckled shape. This can be done by reshaping the geometry with a small amount of the linear elastic buckled shape, or you can apply a small force that will help it to buckle. Here is a YouTube video that explains
can learn something about the critical buckling load and the buckled shape using the linear Eigenvalue Buckling analysis. nStart by taking the Structural Instabilities Course.n are the discussions on linear Eigenvalue Bucklingn are the discussions on nonlinear post buckled analysis.n