Chapter 06, practice problem 6.35 a cylindrical metal specimen having an original diameter of 11.72 mm and gauge length of 51.3 mm is pulled in tension until fracture occurs. the diameter at the point of fracture is 6.58 mm, and the fractured gauge length is 72.7 mm. calculate the ductility in terms of (a) percent reduction in area (percent ra), and (b) percent elongation (percent el).

Amixture of slurry and mud is to be pumped through a horizontal pipe of diameter 500 mm. the fluid behaves as a bingham plastic with a yield stress of 30 pa and viscosity 0.04 pa.s. describe the effects of the shear stress through a transverse section of the pipe by plotting the variation in shear stress and velocity profile: (i) just before the slurry starts to move (ii) as the slurry flows when the pressure gradient is double that in part (i)