2) Stress vs strain plot (15 points) i) For the stress vs. strain plot shown below obtained from a tensile test, fill in the answers to A-F in the Table below. ???? ???? regio region E E D Stress Slope if???? Strain Answer Part of the plot A B C D E F ii) describe how you measure the toughness of the material from a stress-strain plot. What regions of the plot result in reversible shape retention and where in the plot does the shape not return to that of the original sample with release of strain