2. (a) Sketch the graph of engineering-stress vs engineering-strain of a ductile metal and a brittle ceramic. (b) How do you obtain Elastic/Young's modulus? c) How do you calculate Yield stress? (d) How do you obtain tensile stress? (e) Where does the plastic deformation start? (15 pts) 2. (a) Sketch the graph of engineering-stress vs engineering-strain of a ductile metal and a brittle ceramic. (b) How do you obtain Elastic/Young's modulus? c) How do you calculate Yield stress? (d) How do you obtain tensile stress? (e) Where does the plastic deformation start? (15 pts)