The maximum normal stress equals the stress concentration factor multiplied by the nominal stress in the region of the minimum cross-sectional area. Set the maximum normal stress equal to the maximum allowable normal stress in the part and find the corresponding value of the stress concentration factor, K. Determine the stress concentration factor for stresses in the region of the shoulder fillets with radius r.

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.