6 | Conclusions
This paper summarizes an attempt to estimate fatigue life of TC17
titanium alloy considering micro scratch, based on the use of the
three-parameter model combined with \(\sqrt{\text{area}}\).
Conclusions can be drawn as follows:
- Fatigue failure mode for TC17 is that surface failure without facets
in this study. TC17 possesses a high sensitivity to micro scratches in
this experiment.
- With the assistant of \(\sqrt{\text{area}}\), an HCF life model of
TC17 based on micro scratch is established by the combined application
of modified surface condition fatigue strength and the three-parameter
model. With the accuracy of prediction result, it can be concluded
that \(\sqrt{\text{area}}\) has the rationality and validity in
combination classic fatigue-life curve method.
- Reasonable results are obtained in conditional fatigue strength and
fatigue life prediction using \(\sqrt{\text{area}}\) in combination
with current fatigue theories. \(\sqrt{\text{area}}\) has potential
applicability as a useful parameter to study fatigue behavior affected
by micro scratch.