3. Please answer the following questions: a. Draw and label a typical engineering stress-strain curve for a brittle material. b. Draw and label a typical true stress-strain curve for a

ductile material. c. Which of the two materials (brittle vs. ductile) usually obtains the highest ultimate strength and why? d. Which of the two materials (brittle vs. ductile) usually obtains the largest modulus of toughness and why?