P
Patrick Lamb
Guest
On Wed, 22 Dec 2004 18:46:43 GMT, [email protected]
wrote:
>David L. Johnson <[email protected]> writes:
>
>>> All breakage on the non-drive side at the head.
>
>> That's fatigue from the spokes becoming completely de-tensioned when
>> they reach the bottom on every revolution. This leads me to think
>> that all those spokes are probably fatigued, so should be replaced.
>
>Becoming slack does not cause fatigue failures but rather cyclic stress
>near the yield stress. Loose spokes that were never tight, can cause
>repeated flexing at the elbow, which causes high stress. As I see it,
>the identity of the spokes is unknown. I'm not sure they are stainless
>or not.
>I'm not familiar with that hub but I don't see throwing out all the
>spokes if they are stainless. Ones that may be cracked should fail on
>stress relieving.
I was thinking along the lines David was, I think. The remaining
spokes have been subjected to whatever stress cycles the broken spokes
experienced, and it's reasonable there are more spokes that are
cracked and will fail soon. Would it be worthwhile cranking the
tension up on the remaining spokes and stress-relieving them to see
how many fail? Keep in mind the OP is a novice, and when I was in his
shoes, the last thing I wanted to do was to have to repeatedly re-true
and re-tension the wheel while the other 16 spokes break, one at a
time.
Pat
Email address works as is.
wrote:
>David L. Johnson <[email protected]> writes:
>
>>> All breakage on the non-drive side at the head.
>
>> That's fatigue from the spokes becoming completely de-tensioned when
>> they reach the bottom on every revolution. This leads me to think
>> that all those spokes are probably fatigued, so should be replaced.
>
>Becoming slack does not cause fatigue failures but rather cyclic stress
>near the yield stress. Loose spokes that were never tight, can cause
>repeated flexing at the elbow, which causes high stress. As I see it,
>the identity of the spokes is unknown. I'm not sure they are stainless
>or not.
>I'm not familiar with that hub but I don't see throwing out all the
>spokes if they are stainless. Ones that may be cracked should fail on
>stress relieving.
I was thinking along the lines David was, I think. The remaining
spokes have been subjected to whatever stress cycles the broken spokes
experienced, and it's reasonable there are more spokes that are
cracked and will fail soon. Would it be worthwhile cranking the
tension up on the remaining spokes and stress-relieving them to see
how many fail? Keep in mind the OP is a novice, and when I was in his
shoes, the last thing I wanted to do was to have to repeatedly re-true
and re-tension the wheel while the other 16 spokes break, one at a
time.
Pat
Email address works as is.