Problem 5
Given: A steel helical compression spring is required to carry a steady
static load of 150 lb at a deflection of 1.5 in with 2 inactive
end coils. The maximum shearing stress on the inside of the coil
is 90,000 psi.
The spring deflections are within the elastic range of the material
and the spring carries the load in torsional and transverse shear.
Determine a. The nearest standard wire size for the spring
b. The mean radius of the helix, R
c. The number of active coils, $N_c$
d. The volume, $V$, of the spring material