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Help with spring rate

Help with spring rate

Help with spring rate

(OP)
Can someone tell me how to figure the spring rate of a torsion bar? For example, if I have a 4130 bar 29" long, 1" in diameter, with a 5" lever on one end, what will the spring rate be. I just dont want the answer, but the forumla.
Thanks.

RE: Help with spring rate

K=(G*J)/L

Where J=(Pi*D^4)/32

G - Torsional Nodulus
J - Polar Inertla os the bar section
D - Bar Diameter
L - Bar length
K - Spring constant

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