$4\mathrm{.}7$ Side frame deformation

$($Requires access to finite element analysis$)$

Data are provided for a side frame structure. The stiffness requirement is $7000($N$)/($m$)$m

for the vehicle, or $3500($N$)/($m$)$m for each side frame.

a$\backslash$Delta Kj$=1\backslash$times $10^(10)$Nm$($m$)/($r$)$ad may be considered as rigidw,h $200\%$ of the initial dimensions, except the rocker which is restricted to an

increase in size up to $125\%$ due to entry constraints. Thickness on all sections may

be increased up to $3$ mm $.($Do not reduce the size of any beams from the given

initial size.$)$

bk$\_($J$)$

$($a$)($b$)($c$)$

$0\mathrm{.}38\backslash$times $10^(7)$Nm$($m$)/($r$)$ad

$($d$)($e$)2\mathrm{.}80\backslash$times $10^(7)$Nm$($m$)/($r$)$ad

$($f$)($G$)($h$)$

$3\mathrm{.}50\backslash$times $10^(7)$Nm$($m$)/($r$)$ad

Exercise $4\mathrm{.}7$b