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- W3203606691 abstract "We present a complete characterization of the width and depth of a very narrow fatigue crack developed in an Al-alloy dog bone plate using laser-spot lock-in thermography. Unlike visible micrographs, which show many surface scratches, the thermographic image clearly identifies the presence of a single crack about 1.5 mm long. Once detected, we focus a modulated laser beam close to the crack and we record the temperature amplitude. By fitting the numerical model to the temperature profile across the crack, we obtain both the width and depth simultaneously, at the location of the laser spot. Repeating the process for different positions of the laser spot along the crack length, we obtain the distribution of the crack width and depth. We show that the crack has an almost constant depth (0.7 mm) and width (1.5 µm) along 0.7 mm and features a fast reduction in both quantities until the crack vanishes. The results prove the ability of laser-spot lock-in thermography to fully characterize quantitatively narrow cracks, even below 1 µm." @default.
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- W3203606691 date "2021-09-28" @default.
- W3203606691 modified "2023-10-01" @default.
- W3203606691 title "Sizing the Depth and Width of Narrow Cracks in Real Parts by Laser-Spot Lock-In Thermography" @default.
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- W3203606691 doi "https://doi.org/10.3390/ma14195644" @default.
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