Questions Graph the hardness versus reduction in area. Does there appear to be any relationship? Explain your answer 1. 2. What effect does cold working have on the grain size of the material? 3. Estimate what the hardness would be if the area was reduced by an additional 10 percent. Is it safe to assume there is a linear relationship? What would limit this increase in hardness? 4. What is the mechanism that causes an increase in hardness? 5. Is the total of your engineering strain equal to the summation of your engineering strain at each step? Prove your answer mathematically Is the total of your true strain equal to the summation of your true strain at each step? Prove your answer mathematically.