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Required information

Problem $02\mathrm{.}008-$ The stress$-$strain locus, offset yield strength and the tangent modulus of elasticity

The stress$-$strain data from a tensile test on a cast$-$iron specimen are

$\backslash$table$[[({10}^{-3}),],[0,0],[0\mathrm{.}20,5],[0\mathrm{.}44,10],[0\mathrm{.}80,16],[1\mathrm{.}0,19],[1\mathrm{.}5,26],[2\mathrm{.}0,32],[2\mathrm{.}8,40],[3\mathrm{.}4,46],[4\mathrm{.}0,49],[5\mathrm{.}0,54]]$

Problem $02\mathrm{.}008.$b $-$ The tangent modulus of elasticity at zero stress

Determine the tangent modulus at a value of $=30\mathrm{.}00k.$

The tangent modulus at a value of $=30\mathrm{.}00kE$ is ${10}^{6}l\frac{b}{i}{n}^2.$