ENGIN 45 Midterm: e45-fa2008-mt1-Gronsky-soln
Document Summary
Refer to the following stress-strain plot derived from a standard uniaxial tensile test of a high performance titanium alloy to answer the following questions. By the construction shown on the plot, % elongation at failure = 100 x 0. 028 = 2. 8% 2. !bonding (20 points: in problem 1 above, the titanium alloy is described as having metallic bonding. In the initial stages of deformation, atomic bonds are being stretched under the applied load, known as elastic behavior. The nature of the metallic bond is a mutual sharing of electrons, and because titanium has many electrons to share, the bond is a strong one, resulting in a high elastic modulus. During continued deformation the stress-strain curve departs from linearity when atomic bonds are broken due to dislocation nucleation and propagation. Here the non-directional character of metallic bonding provides a benefit, because bonds can be retained even under severe shape change.
