TITLE

Characterization of anisotropic materials with the Laser-Ultrasonic technique using the “in plane” and the “out of plane” measurements of the sample surface displacement

AUTHOR(S)
Bescond, Christophe; Massabki, Maroun; Bertrand, Lionel
PUB. DATE
May 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1457
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The progress of lasers for the generation as for the detection of ultrasonic waves opened ways for many applications where measurements need to be contactless and at a distance. For example, the Laser-Ultrasonic technique is promising for the mechanical characterization of anisotropic materials. Nevertheless, the signal processing as the data analysis becomes more complex than in the case of the classical technique that uses piezoelectric transducers. The generation and detection being punctual on the sample surface, the measured ultrasonic wave velocities correspond to group velocities. That point complicates the elastic tensor determination. In that work, a well adapted formulation is presented and is applied to characterize anisotropic materials, in particular, a composite material where its structure complicates the problem. The localization of wave front arrivals becomes intricate due to the inhomogeneity of such materials regarding their multi-layered structures and the large bandwidth of the acoustical source. In this work, we present measurements of waveforms obtained with a heterodyne laser interferometer that allows us to measure the “in-plane” and the “out-of-plane” displacements of the sample surface. Both measurements authorize a better localization of wave front arrivals. Interests of this technique are underlined. © 2000 American Institute of Physics.
ACCESSION #
6029235

 

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