Fretting Fatigue
(FF) is probably the most insidious of all the
fracture processes that affect engineering components.
A great amount of phenomenological data has been
gathered in the past 40 years, and as many as
50 parameters are known to affect FF behaviour.
This paper briefly discusses some of the more
frequently studied parameters such as fretting
wear, fretting corrosion, relative slip between
component surfaces, and temperature and time effects,
together with the more important aspects of the
surface traction force and the surface normal
applied pressure between components, and finally
the cyclic stresses that are common to all conventional
fatigue (F) and fretting fatigue studies.
Although the FF cyclic stress limit
can be a factor of 10 (or more) lower than the
conventional F limit, with the latter itself being
substantially less than the yield stress of the
fretted material, this paper explores previously
unknown links between FF and F behaviour. In particular,
both Microstructural Fracture Mechanics (MFM)
and Linear Elastic Fracture Mechanics (LEFM) theories
are invoked which explain previously anomalous
test data. This ` introduces a comparison between
a Fretting Fatigue Threshold (FFTH) and the conventional
Fatigue Threshold (FTH), both of which are material
grain size dependent; a parameter that is seldom,
if ever, quoted in scientific papers on fatigue
fracture.
Surface strain concentration studies and fracture
mechanics evaluations of FF lifetimes under laboratory
conditions have completed the first stage of a
comprehensive assessment of FF behaviour in an
aerospace material. An FF test facility is described
which can advance our knowledge with respect to
both the science and the technology relating to
industrial fretting fatigue failures. Future work
should now be aimed at investigating FF under
variable, complex out-of-phase loading that commonly
occurs in engineering components throughout all
sectors of the industrial world.
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1700 Tea
1730 Evening Technical Meeting
1845 Reception
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