A circular cup is produced in a single drawing operation from steel blanks $1$ mm thick. The inside diameter of the cup is $16$ mm and the drawing ratio is $1\mathrm{.}8,$ The flow curve of the sheet metal is given by:

$)=(670{}^{0\mathrm{.}24}$Mpa

Estimate the drawing force at a punch penetration of $0\mathrm{.}4$ the final cup height

$($Assume a forming efficiency $=0\mathrm{.}55).$

$4.$ In deep drawing, where thickening is expected to occur?

Answer with steps plz