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On 2006-12-21, jim beam <[email hidden]> wrote:
[snip]
Quoted message said:let's get one thing crystal clear. all observed spoke fatigue starts
at an outer surface. outer surfaces, in this application, have the
least residual stress.
Are there any situations (not restricted to just spokes) in which
fatigue failure begins on the _inside_ of a piece of metal?
Ben C said:On 2006-12-21, jim beam <[email hidden]> wrote:
[snip]Quoted message said:let's get one thing crystal clear. all observed spoke fatigue starts
at an outer surface. outer surfaces, in this application, have the
least residual stress.Are there any situations (not restricted to just spokes) in which
fatigue failure begins on the _inside_ of a piece of metal?
it can happen, but its very very rare. the point is, residual stress
/can/ approach yield /inside/ a piece of material, but unless there's a
flaw such as a welding crack or a sufficiently large inclusion, it will
/never/ nucleate there, only on the relatively unstressed outside surface.
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