Consider a plane stress problem if Airy's stress function is given by p(x,y) = Axy + Fxy +Gy where A, B, C, D, E, F, and G are constants. The beam is fixed supported at A, and having a rectangular cross section 20 20 W x 1 = WL WL Bx + Cxy + Dy3+ Exy. Determine the expression of the normal stress x, y, shear stress Txy. And, the boundary conditions