The following data were collected from a 20-mm-diameter test specimen of a ductile cast...

The following data were collected from a 20-mm-diameter test specimen of a ductile cast iron (l₀ = 40.00 mm):

After fracture, the total length was 47.42 mm and the diameter was 18.35 mm. Plot the engineering stress–strain curve and the true stress–strain curve. Since the instantaneous cross-sectional area of the specimen is unknown past the point of necking, truncate the true stress–true strain data at the point that corresponds to the ultimate tensile strength. Use of a software graphing package is recommended. Calculate

(a) the 0.2% offset yield strength;

(b) the tensile strength;

(c) the modulus of elasticity, using a linear fit to the appropriate data;

(d) the % elongation;

(e) the % reduction in area;

(f) the engineering stress at fracture; and

(g) the modulus of resilience.