A specimen of ductile cast iron having a rectangular cross section of dimensions 4.8 mm ( 15.9 mm (3/16 in. ( 5/8 in.) is deformed in tension. Using the load-elongation data tabulated below, complete problems (a) through (f).

(a) Plot the data as engineering stress versus engineering strain.

(b) Compute the modulus of elasticity.

(c) Determine the yield strength at a strain offset of 0.002.

(d) Determine the tensile strength of this alloy.

(e) Compute the modulus of resilience.

(f) What is the ductility, in percent elongation?

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Load Length Ibe in. 75.000 2.953 4,740 1,065 75.025 2.954 75.050 9,140 2,055 2.955 12,920 2,900 75.075 2.956 3,720 16,540 75.113 2.957 18,300 4,110 75.150 2.959 20,170 4,530 75.225 2.962 22,900 3,145 75.375 2.968 25,070 3,635 75.525 2.973 26,800 6,025 75.750 2.982 6,440 76.500 28,640 3.012 6,800 78.000 3.071 30,240 79.500 31,100 7,000 3.130 3.189 31,280 7,030 81.000 3.248 30,820 6,930 82.500 29,180 6,560 84.000 3.307 27,190 6,110 85.500 3.366 24,140 3,430 87.000 3.425 4,265 18,970 88.725 3.493 Fracture