Effect Of Residual Stress On The Fatigue Life Resistance Of Ni-base Materials
Operating Under High Applied Loads
Author(s)
M. Belassel, M. Brauss, S. G. Berkley & J. Pineault
Abstract
Effect of residual stress on the fatigue life
resistance of Ni-base materials operating
under high applied loads
M. el ass el', M. Braussl, S. G. Berkle? & J. ~ineault'
'proto Manufacturing Limited, Oldcastle, Ontario, Canada
2~atigue Management Associates, LLC, Jupiter FL, USA
Abstract
Rotating aircraft engine components operating at temperature under high applied
cyclic loads are often subject to low cycle fatigue (LCF) effects. Relaxation of
residual stresses in such components is often a result of LCF and is most
commonly observed in geometrical areas where localized plasticity occurs, i.e.
areas where the applied loads exceed the cyclic yield strength of the material.
The magnitude of residual stress in these areas has been observed to decrease
linearly with the number of take off and landing cycles (TACs). Furthermore, the
rate of relaxation depends greatly upon the severity of the operating conditions in
the engine. To better understand the mechanisms of residual stress relaxation
with
Keywords
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