A cylindrical sample with an initial diameter of 0.25 in. and a height of 0.20 in. is upset in an open-die forge to a height of 0.05 in. and remains circular in cross section. A lubricant is used with...

A cylindrical sample with an initial diameter of 0.25 in. and a height of 0.20 in. is upset in an open-die forge to a height of 0.05 in. and remains circular in cross section. A lubricant is used with a coefficient of friction of 0.10, and the press velocity is 60 ft/min. Assume that cartridge brass is the material used and answer the following questions:

a. What is the engineering strain in the height direction?

b. What is the true strain in the height direction?

c. What is the true strain in the radial direction?

d. What is the pressure-multiplying factor? e. What is the mean flow stress (psi)? f. What is the flow stress if the metal temperature is 600°C?

g. If the calculated flow stress is 60,000 psi, what force in tons is needed

h. If the material was cold worked, what is the expected BHN of the to make the part? material based upon the flow stress for cold working?