Question

A helical compression spring is made of 302 stainless steel wire. The outside coil diameter of the spring is 33.2 mm. The wire diamter is 2.8 mm. The ends are plain and ground, and there are total of 8.5 turns. Determine the deflection of the spring when it is subjected to a compression force of 10 N. In this condition, wil the stress generated in the spring be beyond the maximum allowable torsional stress?

Answer 1

In this solution, as total number of turns in 8.5, the number of complete coils is just 8 that's why total number of coils has been considered 8.

Now, Stress generated in Spring will be given by:

Stress generated in Spring will not be beyond maximum allowable torsional stress because here the value of stress is just 35.282 N/mm² which is very less than the allowable stress which lies in range of 200-700 N/mm²  depending upon the safety of factor.