I am trying to make the jump from a FEM plot of a static load applied to Mindlin laminate plate to a surface visualization of various Mode Shapes of the Laminate Plate. For that, I understand that the two big steps are:
developing a Mass Matrix $[M]$; and
getting the eigenvectors and eigenvalues $[V]$ and $[D]$.
While all my textbooks tell me how to do this for a simple Mindlin plate, I don't know how to do it for a laminate Mindlin plate where the very top and bottom layers are of different thickness. All the resources I have found only deal with the most generic of situations. If anyone of you could explain to me what changes (if any) I need to make to the equations, that would be great.
After assembling my mass and stiffness matrices I solve the generalized eigenvalue problem
D, V = eig(stiffness(activeDof, activeDof), M_g(activeDof, activeDof)
But then I do not fully understand what I do with the results. Also, I don't get how to represent the modes in graph form. I know that I'm asking a lot, but if you could at least point me toward a good resource.