期刊
MATERIALS
卷 14, 期 19, 页码 -出版社
MDPI
DOI: 10.3390/ma14195644
关键词
laser-spot thermography; lock-in infrared thermography; nondestructive evaluation; crack detection
类别
资金
- Ministerio de Ciencia e Innovacion [PID2019-104347RB-I00]
- Gobierno Vasco [PIBA 2018-15]
- Universidad del Pais Vasco UPV/EHU [GIU19/058]
A study characterizing a very narrow fatigue crack in an Al-alloy dog bone plate using laser-spot lock-in thermography. Results show the crack has nearly constant depth and width along 0.7 mm length, with fast reduction in both quantities until the crack vanishes. The study demonstrates the ability of laser-spot lock-in thermography to quantitatively characterize narrow cracks, even below 1 µm.
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 mu m) 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 mu m.
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