ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The results of an experimental research on plain concrete are presented. The non-linearbehavior of both virgin and damaged samples is investigated by means of ultrasonic tests: recenttheoretical models, indeed, have pointed out that mono-frequency ultrasonic excitations bring tolight such phenomena as harmonic generation and sidebands production, which are essentially dueto the material classical or hysteretic non-linearity. The estimation of the harmonic componentsparameters (amplitudes and phases) is achieved through a signal processing technique based onMUltiple SIgnal Classification (MUSIC) system, which reveals to be optimal for the specific signalmodel here considered. The experiments described in this paper show that the material non-linearfeatures increase with increasing level of internal micro-cracking, thus suggesting the possibility touse the ultrasonic signal analysis in the frequency domain as a valuable tool for damage assessment
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.347.633.pdf
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