The thin rectangular plate (Fig. 1, not to scale) with sides 6 m and 4 m of thickness 112 mm is subjected to the stresses σx, σy and Txy. An Airy stress function is proposed to be: (x, y) = Ax³ + Bxy + Cxy³, with A=B=C=1 (a) Determine the values of stresses (ox, σy and txy) at point (x,y) which satisfy the stress function. (b) Draw a stress element showing the stresses on the four faces of the element (Use the face bounded by the X- and Y-axes with a line representing a face, that is, a 2-D stress element). (c) Neglecting body forces, determine the resultant normal and shearing forces on the top face of the plate that are consistent with o. 4 m 6 m Fig. 1 112 mm