I have used Mindlin plate theory to calculate the displacement and rotation given a shell under specified boundary conditions and loads. However, displacement and rotation can corresponds to Shell-43, with a narrow difference from Shell-181. I wonder what the improvement of Shell-181 is compared with Shell-43. Searching for the URL in Ansys, I found a keyword Bathe-Dvorkin theory. Could you please tell me whether BD theory has been applied to Shell-181 and how it were deduced if yes.
Thanks!!