Table 1.

Specifications of the four springs used in the experiments

Spring No.	Century Stock No.	Outside Diameter (in)	Inside Diameter (in)	Free Length (in)	Spring Rate (lb/in)	Max Deflection (in)	Max Load (lb)	Solid Length	Wire Diameter (in)	Total Coils
SP1	12699	0.953	0.873	1	2.8	0.82	2.3	0.18	0.04	3.5
SP2	S-1141	0.562	0.494	1	3	0.77	2.3	0.23	0.034	5.75
SP3	70790S	0.3	0.256	1	2.6	0.56	1.4	0.16	0.022	7.25
SP4	W-42	0.219	0.167	0.94	5	0.47	2.3	0.47	0.026	18