A simple model to account for the role of microtexture on fatigue and dwell fatigue lifetimes of titanium alloys

A deterministic model to account for the effect of initial crack size, microtextured region size and aspect ratio on the mean cyclic and dwell fatigue lifetimes of titanium alloys is described. The model also quantifies variability in lifetime from sample to sample due to differences in the position of subsurface crack initiation. The results indicate that dwell fatigue life and cyclic fatigue life depend most on microtexture region size and initial crack size, respectively.