A 90-mm × 30-mm rectangular beam of length 2 m is made of heat treated aluminum alloy 2024-T851. The beam is simply supported with a uniformly distributed load of intensity po. On the tension side of the beam, a transverse crack of length 9 mm is discovered at a distance of 0.4 m from one end of the beam. Determine the magnitude of the load po that will cause brittle fracture.

Fig: 1