Title of article :
Sonic infrared imaging of fatigue cracks
Author/Authors :
L.D. Favro، نويسنده , , R.L. Thomas، نويسنده , , X. Han، نويسنده , , L. Z. Ouyang، نويسنده , , G. Newaz، نويسنده , , D. Gentile، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2001
Pages :
6
From page :
471
To page :
476
Abstract :
We describe a novel hybrid ultrasonic/infrared nondestructive technique for detecting cracks. This technique uses a short pulse of low frequency ultrasound to cause the crack surfaces to rub or clap, thus inducing frictional heating. The heating is then observed through the use of an infrared (IR) video camera. In the case of a surface-breaking crack, the appearance of the image of the crack takes only milliseconds after the initiation of the ultrasonic pulse. Subsurface cracks become visible to the IR camera with time delays that are determined by diffusion of the heat from the crack to the surface of the sample. Using this method we have observed fatigue cracks as short as 20 μm in metal samples.
Keywords :
Infrared , Ultrasound , Cracks , nondestructive evaluation
Journal title :
INTERNATIONAL JOURNAL OF FATIGUE
Serial Year :
2001
Journal title :
INTERNATIONAL JOURNAL OF FATIGUE
Record number :
1160600
Link To Document :
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