Question

A helical compression spring is made of 3mm diameter music wire. The outside coil diameter of the spring is 14mm. Find the static load of the spring in N if the torsional yield stress is 3.7GPa.

Answer 1

Given data:

Diameter of wire, d= 3 mm

Diameter of mean coil, D= 14-3=11 mm.

So spreing index,

Tortional yeild stress= 3.7 GPa.

Let us take Tortional shear stress=Tortional yeild stress

For pure static load only consider shear stress correction factor, K_s

Where F is force, N

F= 3125.6 N ..............ANSWER