The rigid bar ABC is supported by two links, AD and BE, of the uniform 37.5 x 6-mm rectangular cross section and made of a mild steel that is assumed to be an elastoplastic with E = 200 GPa and sigmay = 250 MPa. The magnitude of the force Q applied at B is gradually increased from zero to 260 kN. Knowing that a = 0.640 m, determine
(a) the value of the normal stress in each link,
(b) the maximum deflection of point B.