$6-41$ The following data were collected from a

$20-$mm$-$diameter test specimen of a ductile

cast iron $(l_0=40\mathrm{.}00(mm))$ :

After fracture, the total length was $47\mathrm{.}42$

mm and the diameter was $18\mathrm{.}35$ mm $.$ Plot

the engineering stress strain curve and

calculate

$($a$)$ the $0\mathrm{.}2\%$ 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;

$($g$)$ the true stress at necking; and

Thank you!!!