Question $1$

$1\mathrm{.}1$ Describe the mathematical equation for the flow curve as used in metal forming process.$(2)$

$1\mathrm{.}2$ Describe ethe Extrusion process as used in metal forming operation.

$1\mathrm{.}3$ Calculate the value of the strain$-$hardening exponent for a metal that will cause the average flow stress to be $88\%$ of the final flow stress after deformation

$1\mathrm{.}4$ A work part with starting height $h=140mm$ and diameter $=85mm$ is compressed to a final height of $78$ mm $.$ During the deformation, the relative speed of the plattens compressing the part $=320m\frac{m}{s}.$ Determine the strain rate at

$1\mathrm{.}4\mathrm{.}1h=120mm,$

$1\mathrm{.}4\mathrm{.}2h=90m,$ and

$1\mathrm{.}4\mathrm{.}3h=50mm.$