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27 December 2001 Detection of metal fatigue by laser-instituted thermal vibration
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It is important to detect the metal fatigue in the steel. There are several known methods of detecting metal fatigue. However, there is a problem in which it is not the non- destruction and large equipment. We are investigating the method of metal fatigue by the laser induced thermal vibration. When the target absorbs a laser beam, the temperature gradient occurs in the surface and the back of the target. The steel is bent by this temperature gradient. When the intensity of laser is modulated, the target vibrates by the repetition of the bending. This method detects the metal fatigue from the variations of the amplitude vibration by material degradation, which is generated by the metal fatigue. It is non-destructive evaluation method and simple equipment. We succeeded in the detection of the metal fatigue by this method from the sample, which beforehand added the fatigue. In this paper, we compared the detection result with addition way of the fatigue. Then, effectiveness and features of this method were confirmed.
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Akira Mori, Sinichi Iwasa, and Kaoru Suzuki "Detection of metal fatigue by laser-instituted thermal vibration", Proc. SPIE 4468, Engineering Thin Films with Ion Beams, Nanoscale Diagnostics, and Molecular Manufacturing, (27 December 2001);

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