a body with a plane stress field has material properties E= 210GPa,v=0.3 and has the following displacement field
u(x,y)= 30x^2-10x^3y+20y^3 mm
v(x,y)= 10x^3+20xy^3+5y^2 mm
where x and y are in meters. determine the stresses and the rotation of the body at x= 0.050m and y=0.020m is the displacement field compatible?