結晶塑性FEMとin-situデジタル画像相関を用いたTi-6Al-4VのMicro Texture RegionにおけるCold Dwell Fatigue寿命予測

抄録

Ti-6Al-4V is 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 Ti-6Al-4V 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) and digital image correlation (DIC).