Location

Snowbird, UT, USA

Start Date

1-1-1999 12:00 AM

Description

Ultrasonic laser techniques are widely used in non-destructive inspection. Owing to theirs numerous advantages [1], these contactless methods allow characterization of anisotropic and viscoelastic media [2, 3]. Ultrasonic bulk waves, whatever the longitudinal or transverse mode, or their multiple reflections propagating back and forth through the plates, can been detected by interferometric laser techniques. But, how to obtain informations on the stiffness and viscosity tensors? The spectrum ratio between a mode and its reflection allows to get these data. Nevertheless it requires to identify the arrival time of the different modes and of their reflections and to take into account the effect of both dispersion and diffraction. The adopted solution is a parametric method which allows to set free from these problems.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

18B

Chapter

Chapter 5: Engineered Materials

Section

Composites

Pages

1257-1264

DOI

10.1007/978-1-4615-4791-4_161

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Measurement by Laser Generated Ultrasound of Both Stiffness Coefficients and Viscosities of an Isotropic Polymer Material

Snowbird, UT, USA

Ultrasonic laser techniques are widely used in non-destructive inspection. Owing to theirs numerous advantages [1], these contactless methods allow characterization of anisotropic and viscoelastic media [2, 3]. Ultrasonic bulk waves, whatever the longitudinal or transverse mode, or their multiple reflections propagating back and forth through the plates, can been detected by interferometric laser techniques. But, how to obtain informations on the stiffness and viscosity tensors? The spectrum ratio between a mode and its reflection allows to get these data. Nevertheless it requires to identify the arrival time of the different modes and of their reflections and to take into account the effect of both dispersion and diffraction. The adopted solution is a parametric method which allows to set free from these problems.