Location

Brunswick, ME

Start Date

1-1-1997 12:00 AM

Description

Measuring elastic constants (Cij) of composite materials from ultrasonic velocities is a very well known technique1,2, using the propagation of bulk modes generated at the fluid-solid interface. There is still a question about the validity of these measurements at lower frequencies or for static stress fields. These materials made with viscoelastic matrix are anisotropic and viscoelastic. Hence, the attenuation is also anisotropic. In an absorbing medium, the propagation of waves is dispersive: the phase velocity depends on the frequency. Attenuation and velocity are linked together through the Kramers-Kronig relations that are deduced from the principle of causality3.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

16B

Chapter

Chapter 5: Engineered Materials

Section

Composites

Pages

1091-1098

DOI

10.1007/978-1-4615-5947-4_142

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Experimental Verification of Kramers-Kronig Relationship in Anisotropic Composite Materials

Brunswick, ME

Measuring elastic constants (Cij) of composite materials from ultrasonic velocities is a very well known technique1,2, using the propagation of bulk modes generated at the fluid-solid interface. There is still a question about the validity of these measurements at lower frequencies or for static stress fields. These materials made with viscoelastic matrix are anisotropic and viscoelastic. Hence, the attenuation is also anisotropic. In an absorbing medium, the propagation of waves is dispersive: the phase velocity depends on the frequency. Attenuation and velocity are linked together through the Kramers-Kronig relations that are deduced from the principle of causality3.