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:
  1. 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.
  2. 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.
  3. 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.