Crystal Plasticity Finite Element Simulation on Cold Dwell Fatigue of Micro Texture Region in Ti-6Al-4V

Abstract

Titanium alloys such as Ti-6Al-4V are widely used for aircraft engine parts due to their high specific strength. It is known that micro texture region, in which crystal orientations are locally concentrated in a specific direction, in titanium alloys causes a decrease in life due to cold dwell fatigue (CDF), where fatigue and room-temperature creep are superimposed. Therefore, we investigated the fracture mechanism and the life prediction method for CDF by calculating the stress and strain in and around the micro texture region by the crystal plasticity finite element method (CPFEM).