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Detection Method of Fatigue Damage in Carbon Steel Using Laser Ultrasonics

Authors :
Yasukazu Izawa
Takao Tanaka
Source :
Journal of Nuclear Science and Technology. 39:514-519
Publication Year :
2002
Publisher :
Informa UK Limited, 2002.

Abstract

Ultrasonic attenuation was measured by the laser ultrasonic technique among the carbon steel specimens which were subjected to five stages of fatigue damage by constant cyclic tensile stress amplitude. Irradiation of a Q-switched laser was used for ultrasonic generation, and a laser interferometer which consists of a frequency-doubled continuous wave laser and a Fabry-Perot etalon was used for detection of ultrasonic vibration on the specimen surface. From the comparison of the broadband ultrasonic waveforms among five stages of fatigue damage, the attenuation coefficient of the longitudinal wave by the intrinsic material attenuation increased progressively with increasing the number of fatigue cycle. Ultrasonic attenuation at 2.5, 5.0, 7.5 and 10.0MHz were also calculated by Fourier transformation in order to compare the decay of the longitudinal wave among these frequency components. From the results, ultrasonic attenuation increased as the number of fatigue cycle increased, in both broadband and narrow...

Details

ISSN :
18811248 and 00223131
Volume :
39
Database :
OpenAIRE
Journal :
Journal of Nuclear Science and Technology
Accession number :
edsair.doi...........05602d4cdab3775303b470f9c85b178b
Full Text :
https://doi.org/10.1080/18811248.2002.9715229