Consider a beam made of 7075-t6 aluminum with h = 1 in, and thickness t. the plane strain fracture toughness for the material is 26 and yield strength is 75 ksi. find the nominal bending moment m to fracture the beam for crack lengths a = 0.10, 0.20 and 0.30 in, and plate thicknesses of t = 0.10, 0.20 and 0.30 in. find the plastic zone radius and ratio for all cases at the point of fracture. can you justify linear elastic fracture mechanics assumption at the crack tip based on

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.