Leo Lichtman wrote:
"jim beam" wrote: existence of residual stress does not mean it causes
spoke fatigue.
simple observation shows the truth. spokes are not observed to have their
cracking initiate in regions of high residual stress, but in regions of
high applied stress. as one might expect given that spoke elbows, by
definition, are subject to bending as a function of being offset from the
spoke axis.

simple observation of the facts. i suggest you try educating people on
basic scientific method rather than leaping to conclusions. or trolling.
^^^^^^^^^^^^^^^^^^^^^^
Residual COMPRESSIVE stress would tend to reduce fatigue failure, since
fatigue cracks grow ONLY under tensile stress. That observation does not
depart from the scientific method. leap to conclusions, and certainly is not
trolling. Under tension, spoke bends try to straighten out, which creates
tensile stress on the inside of the bend. Any residual compressive stress
in that area as a result of the formation of the bend would have the effect
that Peter Cole referred to.



but the region of highest residual stress is near the neutral plane, not
the outer parts of the bend where fatigue is always observed to
initiate. and in fact, fatigue is still observed to initiate where, if
there is any, compressive residual is compressive, on the outer part of
the elbow.

again, observe the facts, bother to understand the whole story, and
don't leap to conclusions.