Residual stress in the axial direction of the steel wires has been measured by using a method based on the combination of the focused ion beam (FIB) milling and digital image correlation software. That is, the residual stress was calculated from the measured displacement field before and after the introduction of a slot along the steel wires. The displacement was obtained by the digital correlation analysis of high-resolution scanning electron micrographs, while the slot was introduced by FIB milling with low energy beam. The fitting of the experimental results to an analytical model with the independent Young's modulus determined allows us to find the residual stress. The complete experimental procedures are described and its feasibilities are also evaluated for the thin-sized steel wires.
The residual stress in axial direction of the steel wires has been measured by using a
method based on the combination of the focused ion beam (FIB) milling and digital image
correlation (DIC) program. The residual stress is calculated from the measured displacement field
before and after the introduction of a slot along the steel wires. The displacement is obtained by the
digital correlation analysis of high-resolution scanning electron micrographs, while the slot is
introduced by FIB milling with low energy beam. The experimental procedures are described and
the feasibilities are demonstrated in steel wires fabricated with different conditions.
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