Impact Damage on Titanium Leading Edges from Small Hard Objects.

摘要

Impact damage on titanium leading edge configurations was studied by performing a series of hard particle impact tests and characterizing the damage. Fatigue tests were used to assess the damage and to investigate the applicability of the concept of an equivalent elastic stress concentration factor to characterize severity of damage. Notch fatigue specimens were also fatigue tested in tension to provide baseline data for the titanium material. The data demonstrated reasonable reproducibility and showed that the extent of a particular type of damage could be categorized in terms of an equivalent elastic stress concentration factor. The fatigue test results also showed that the damage sustained from very small particles, which completely perforated the leading edge and removed material was essentially the same in terms of fatigue strength as a machined notch of the same geometry.