Quantitative damage evolution in dynamic incipiently failed Ti-6Al -4V

Abstract
Incipient and full failure tests were performed using a momentum-trapped tensile Hopkinson split pressure bar at strain rates of ≈ 2000/s. Aerospace grade Ti-6Al-4V is used in this study as a two-phase model material. The sample geometries used included cylindrical uniaxial stress tension specimens and the Hancock and Mackenzie Enotch geometry [l] to explore stress States from 1/6 ≤ -P/2τ ≤ 1/3. The momentum trapping [2] resulted in single stress pulse loading. The recovered samples were sectioned, and metallographically analyzed. The resulting damage was quantified using image analysis. Voids were found in all of the arrested tensile specimens of ≤ 20 µm in diameter. The maximum porosity was found to increase with plastic strain to approximately 1.1% at 85% of the energy required to fail the specimen.