A 0.505-in. diameter metal bar with a 2-in. gage length lo is subjected to a tensile test. The following measurements are made in the plastic region: Force (Ib) 27500 27000 25700 Change in Gage Length (in.) 0.2103 0.4428 0.6997 Diameter (in.) 0.48 0.4566 0.4343 Determine the strain hardening exponent for the metal. Is the metal most likely to be FCC, BCC, or HCP? 20
