$2021-2027$ SUMMER SEMESTER

ME$312$ Homework exam

FULL NAME:

$3$NO:

A helical compression spring shown in figure, is to be made of oil$-$tempered wire of $8$ mim diameter with a $100$ mm spring average diameter.

The squared end spring used in shock absarber$.$ The free length of the spring should he $800$ mm $.$ A force of $500$ N should deflect the spring $150$ mm $.$

$($a$)$ Determine the spring rate.

$($c$)$ Determine the total number of coils needed.

$($d$)$ Determine the solid length.

$($e$)$ Determine a static factor of safety based on the yielding of the spring if it is compressed to its solid length