Nondestructive Fatigue Damage Assessment For Ti-6A1-4V Alloy
Author(s)
J. K. Na, J. Frouin & S. Sathish
Abstract
Nondestructive fatigue damage assessment
for Ti-6Al-4V alloy
J. K. ~ a ' , J. ~ r o u i n ~ & S. sathish2 ' Veridian Engineering, USA
'University of Dayton Research Institute, USA
Abstract
Titanium alloys are widely used for aircraft structures, especially Ti-6A1-4V
alloy for jet engine parts. In this work, a nondestructive method that can be used
to assess fatigue damage in metals is presented. Several experimental results are
shown and an attempt is made to correlate the level of fatigue damage with the
acoustic nonlinearity parameter, P. The difference between Low Cycle Fatigue
(LCF) and ,High Cycle Fatigue (HCF) damage is discussed in terms of P and
microstructure dislocation density. For LCF, the damage is found to be wide
spread over a big area, while a localized damage pattern for HCF in a relatively
small area. The dislocation density data taken with a TEM also shows a good
correlation with p.
1 Introduction
Under a cyclic mechanical loading, metals undergo fatigue damage inducing
cha
Keywords
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