An engineering stress of 291 MPa causes an engineering strain of .030 in a cylindrical 304 stainless steel rod that is initially 140 mm long (E=193 GPa, Stress(sub-y)=20 MPa, Stress(sub-uts)=515 MPa, % elongation at fracture=40%, strain hardening exponent=0.44) When the rod is loaded to 35,000 N, it experiences a true strain of .048.
a. What is the engineering stress (MPa) in the rod when supporting the load?
b. What is the length (mm) of the rod when supporting the load?
c. What is the length (mm) of the rod when the load is removed?
d. After the load is removed, the new length (answer c.) is definded as Lo and the corresponding area defined as Ao. If the bar is now reloaded to an engineering stress of 360 MPa, what is the new engineering strain?