Current Attempt in Progress

Figure $6\mathrm{.}23$ shows the tensile stress$-$strain curve in the elastic region for a gray cast iron. Determine $($a$)$ the tangent modulus at $10\mathrm{.}3$

MPa and $($b$)$ the secant modulus taken to $6\mathrm{.}9$ MPa $.$

Figure $6\mathrm{.}23$ Tensile stress$-$strain behavior

for a gray cast iron.

$($a$)$

GPa

$($b$)$

GPa