sway bar sizing

[efini13]

Anybody know how to properly size sway bars without alot of experimenting. I had some formulas written down in my notes that went over torsion rates, lengths, and diameters but I can't find them. I spent over two hours trying to find them on the internet and no luck. Any help would be greatly appreciated. Thanks in advance.

 

[GregLocock]

Do you just want the approximate torsional rate - that's easy.

d=diameter
G=shear modulus
M=lever arm*force
L=length of torsional section


Wt=.196*d^3
I=.098*d^4

torsional stress=M/Wt

angular rotation=L*M/(G*I) in radians




Cheers

Greg Locock

 

[efini13]

Thank You. That is all I need. I appreciate the help. I am very happy to to have found a forum with intelligent members where I can get a straight answer. Thanks again.

 

[evelrod]

There is a very good book on basics of anti roll bar design by Fred Puhn of San Diego. I think it's "How to Make Your Car Handle" published by H.P. Books out of Tucson. It's been many years since I looked at it but as I remember it cut through all the BS of bar design and race car suspension setup. It is a difficult at best job to do without a lot of trial and error.

Rod