In: Mechanical Engineering
A spring with a spring rate of 75 lb/in has a working deflection of 1 in. It provides a minimum of 150 lb at installation. The spring is formed from 0.25 in diameter unpeened music wire. The coil has squared and ground ends, and it fits in a 2.1 in diameter hole with 0.1 in clearance.
Assuming a 15% clash allowance, find:
a) Safety factor for infinite life in fatigue
b) Shut height
c) Safety factor at shut height
d) Total number of coils
e) Free length