Slip intermittency and dwell fatigue in titanium alloys: a discrete dislocation plasticity analysis

〈112̄0〉-orientation-dependent crack initiation in a titanium alloy under dwell fatigue

“…large macroscopic Schmid factor associated with γ and φ angles) can intensify the magnitude of stress drop, resulting in a large stress oscillation. 43 Although the time-dependent deformation cannot be effectively characterized by our current research methods, the issue is indeed worthy of further research.…”

“…Moreover, the time-dependent deformation of α grains also affects the initiation of dwell fatigue cracks. 37,41–45 Numerous investigations show that the time-dependent deformation behavior (or strain rate sensitivity) of α grains is closely relevant to their crystallographic orientation. 37,43,44 The strain rate sensitivity of α grains varies with the declination angle ( γ angle) between their c -axis and the applied stress, with a larger γ angle associated with stronger strain rate sensitivity.…”

“…37,41–45 Numerous investigations show that the time-dependent deformation behavior (or strain rate sensitivity) of α grains is closely relevant to their crystallographic orientation. 37,43,44 The strain rate sensitivity of α grains varies with the declination angle ( γ angle) between their c -axis and the applied stress, with a larger γ angle associated with stronger strain rate sensitivity. 44 Meanwhile, a strong strain rate sensitivity can increase the stress redistribution from soft grains to hard grains caused by the load shedding, thereby increasing the local stress of hard grains and promoting the cracking of hard grains.…”