Acylindrical part is warm upset forged in an open die. the starting work piece is 50 mm in diameter, and 40 mm in hieght. the final height=20mm. coefficent of friction at the die-work interface =0.2. the work material has a flow curve defined by k=600 mpa, and n=0.12. determine the force in the operation at process begins, at intermediate height of 30 mm, and at the final height of 20 mm.

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)