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Author(s): T. Hattori, M. Yamashita & N. Nishimura
Abstract:
The fretting fatigue process has many features such as early stage crack initiation
at the contact edge, very slow crack propagation and fatigue failure after a very
long life operation.
In a previous paper we presented a new fretting fatigue
model which can explain these fretting fatigue features reasonably.
In this paper
we try to explain many other fretting features such as fretting fatigue strength
and life dependence on contact pressure and contact edge shapes.
Firstly we try
to discuss the dependence of fretting fatigue strength/life on contact pressure.
In
accordance with the increase of the contact pressure the stress concentration at
the contact edge increased and crack initiation stress level decreased.
But to open
these small cracks initiated at contact edges more wear or more load cycles are
needed.
So fretting fatigue strength limit decreased in accordance with the
increase of contact pressure and fretting fatigue life increased in accordance with
the increase of contact pressure.
Then we discuss the fretting fatigue strength
dependence on the contact edge shape, such as stress release projection or
interference of the contact edge with the stress concentration fillet.
Experimental
results of fretting fatigue strength improvement with stress release projection can
be explained analytically.
The two-stage S-N curve can be shown in joint
structures, in which contact edge is set near the stress concentration fillet.
These
features can also be explained analytically in this paper.
Keywords:
fretting fatigue, fretting wear, contact pressure, contact edge shape,
stress singularity parameter, stress intensity factors.
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Pages: 10
Size: 1,949 kb
Paper DOI: 10.2495/SECM070271
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