$\backslash$rho $=7\mathrm{.}85($g$)/($c$)$m$^(3)$;E$=200$GPa; Tensile yield

strength $=250$ MPa ; UTS $=400$MPa; Elongation in $50$ mm specimen $=30\%\backslash$rho $=2\mathrm{.}71($g$)/($c$)$m$^(3)$;E$=68\mathrm{.}9$GPa; Tensile yield strength $=255$ MPa ; UTS $=290$ MPa ;

Elongation in $50$ mm specimen $=12\%($R$)/($t$)$ is given by the equation

e$=(1)/(((2$R$)/($t$))+1)$