Loose Hub Flange Factors Fl and Vl
Loose Hub Flange Factors Fl and Vl
(OP)
Howdy,
The hub length I am using for my flange yields an h/h0 ratio of 8. The maximum ratio given in the figure for Fl and Vl is 2. Is there a minimum value of Fl and Vl or is there a way to compute it?
The hub length I am using for my flange yields an h/h0 ratio of 8. The maximum ratio given in the figure for Fl and Vl is 2. Is there a minimum value of Fl and Vl or is there a way to compute it?





RE: Loose Hub Flange Factors Fl and Vl
RE: Loose Hub Flange Factors Fl and Vl
RE: Loose Hub Flange Factors Fl and Vl
RE: Loose Hub Flange Factors Fl and Vl
RE: Loose Hub Flange Factors Fl and Vl
Your particular flange detail is not defined. I infer that you are considering the hub in the flange stress calculations, otherwise Fl and Vl are not used. I infer you have an unusually long hub. I see no limits on hub length stated in Appendix 2. I see no practical benefit of an unusually long hub, if you are machining from a forging you are just throwing away material unecessarily.
Care to provide more detail?
Regards,
Mike
RE: Loose Hub Flange Factors Fl and Vl
Thank you for the reply!
the hub length is 3.89 [inches] with B = 0.9 [inches] h0 = sqrt(B*g0) where g0=g1=0.23 [inches]. h/h0 yields a value close to eight which is off the Vl and Fl charts, given such a high ratio. I understand it is a waste of material, but the machining time for a separte short piece wouldn't be worth it. I have also used MS Excel to automate the calculations for Fl and Vl, it took forever. I get reasonable, correct, answers for these factors as long as I'm between an h/h0 ratio given in the table. As soon as I exceed the ratio (greater than 2) my numbers seem to error out.
RE: Loose Hub Flange Factors Fl and Vl
I think I would place an imaginary butt-weld at, say, h=3/4 in. and go on down the road.
Regards,
Mike