Anti-sway bar spring constant
Anti-sway bar spring constant
(OP)
I'm in a back-and-forth with a guy on a car board about the stiffness of an anti-sway bar. From what I recall (and from what I've found in my old texts), a solid bar in torsion has a spring constant that varies with the 4th power of the bar diameter. The spring constant is given for a soild bar in torsion in my old (8th edition) Mark's Handbook as: k=G*Ip/L where Ip is the polar moment of inertia which is defined as pi*d^4/32 where d = diamter of the solid bar.
Hence my assumption that the stiffness of a sway bar was proportional to the 4th power of the diameter. Is this correct? Here's the link to the thread in question: http:// www.bimmer fest.com/f orums/show thread.php ?t=145483& amp;page=2 (post #32 and lower).
Thanks,
Chuck
Hence my assumption that the stiffness of a sway bar was proportional to the 4th power of the diameter. Is this correct? Here's the link to the thread in question: http://
Thanks,
Chuck





RE: Anti-sway bar spring constant
[length]^3 terms such as Do^3 or (Do^4 - Di^4)/Do are involved in section modulus quantities, which are related to component stress under load, not stiffness.
Norm
RE: Anti-sway bar spring constant
Your response has pointed me down the right path to reviewing/understanding this subject once again.
Cheers,
Chuck