Elucidation of dwell-fatigue behavior in Ti-6Al-4V alloys by AE monitoring and Crystal plasticity simulations

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The main objective of this research is to elucidate cold dwell fatigue mechanisms in Ti6Al-4V alloys in comparison with pure fatigue through a combination of in-situ observationsand numerical simulations. The specific progresses are described below:(1)A High-resolution strain mapping method based on the digital image correlation of surface nano-scale pattern produced by gold nanolayered film through vapor-assisted remodeling was developed.(2)An automated framework for identifying slip system and assessing strain localization of slip bands termed ASSISL (automated Slip System Identification and Strain Localization analysis of slip bands) was developed.(3)The framework was applied to quantifying the differences in strain partitioning between pure and dwell fatigue.