T
Tim McNamara
Guest
In article <[email protected]>,
jim beam <[email protected]> wrote:
> Ben C wrote:
> > On 2007-03-10, [email protected] <[email protected]> wrote:
> >>> You mentioned "Finish Line" before-- that's the stuff I put on my
> >>> chain. I thought it was basically oil. But let's not get into a
> >>> flame war on the difference between oil, wax and grease
> >>
> >> http://www.finishlineusa.com/products/teflon-plus-lube.htm
> >>> Now that is interesting.
> >>>> " The change occurs at any high tensile stress location when the
> >>>> spoke is over-tensioned (over its static tension)." Q. Is the
> >>>> location manifest in a physical form? Does the "yield" maximize
> >>>> as an average when the spoke is both straight or near its
> >>>> unstrung state - yet strung?
> >>> Wait for JB to answer, but I think the yield here would generally
> >>> be intended to be a small amount on the outside of the bend at
> >>> the elbow.
> >> on the outside! heheheheh wait! lube the inside, progress! stress
> >> is on the inside, no?
> >
> > It's on both sides, but it's compressive on the inside and tensile
> > on the outside. It's the tensile stress on the outside that's the
> > biggest risk for shortening the fatigue life of the spoke.
>
> i've got broken spokes that have fatigue initiating from the inside
> as well as the outside.
>
> my thoughts are that if it's broken on the outside, the spoke flange
> was insufficiently indented by over-stress, so the net exit angle
> created a tensile stress component on the outside of the spoke.
Or you just failed to correct the spoke line properly. In short, user
error.
jim beam <[email protected]> wrote:
> Ben C wrote:
> > On 2007-03-10, [email protected] <[email protected]> wrote:
> >>> You mentioned "Finish Line" before-- that's the stuff I put on my
> >>> chain. I thought it was basically oil. But let's not get into a
> >>> flame war on the difference between oil, wax and grease
> >>
> >> http://www.finishlineusa.com/products/teflon-plus-lube.htm
> >>> Now that is interesting.
> >>>> " The change occurs at any high tensile stress location when the
> >>>> spoke is over-tensioned (over its static tension)." Q. Is the
> >>>> location manifest in a physical form? Does the "yield" maximize
> >>>> as an average when the spoke is both straight or near its
> >>>> unstrung state - yet strung?
> >>> Wait for JB to answer, but I think the yield here would generally
> >>> be intended to be a small amount on the outside of the bend at
> >>> the elbow.
> >> on the outside! heheheheh wait! lube the inside, progress! stress
> >> is on the inside, no?
> >
> > It's on both sides, but it's compressive on the inside and tensile
> > on the outside. It's the tensile stress on the outside that's the
> > biggest risk for shortening the fatigue life of the spoke.
>
> i've got broken spokes that have fatigue initiating from the inside
> as well as the outside.
>
> my thoughts are that if it's broken on the outside, the spoke flange
> was insufficiently indented by over-stress, so the net exit angle
> created a tensile stress component on the outside of the spoke.
Or you just failed to correct the spoke line properly. In short, user
error.