Dear All

 I have a problem with some theories in plate analysis such as bending and buckling of plates.

 you know that in various theories of plates, equations have different order and different number of boundary condiotions must be apply. for example in classisal theory of plates we have 4 B.C.,  and in first order shear deformation theory the number of B.C. are 5.

I am confused, how should I recognize the number of required B.C. in each theory?

Regards

Mansouri