Location

La Jolla, CA

Start Date

1-1-1993 12:00 AM

Description

The inverse problem related to the measurement of complex viscoelastic constantsCij=C′ij+iC′′ijin composite materials is often well solved with ultrasonic immersion method 1,2. However, this method imposes a very limited frequency bandwidth. The frequency cannot be too high to respect the homogeneous materials condition and not too low to separate the internal reflections by windowing the first transmitted mode. If there exists a such frequency bandwidth, the medium is viewed like homogeneous and infinite. The measured Cij represent the effective complex viscoelastic constants of orthotopic and symmetric laminates at that frequencies.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

12B

Chapter

Chapter 5: Engineered Materials

Section

Composite Properties

Pages

1201-1207

DOI

10.1007/978-1-4615-2848-7_153

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Validation at Lower Frequencies of the Effective Elastic Constants Measurements for Orthotropic Composite Materials

La Jolla, CA

The inverse problem related to the measurement of complex viscoelastic constantsCij=C′ij+iC′′ijin composite materials is often well solved with ultrasonic immersion method 1,2. However, this method imposes a very limited frequency bandwidth. The frequency cannot be too high to respect the homogeneous materials condition and not too low to separate the internal reflections by windowing the first transmitted mode. If there exists a such frequency bandwidth, the medium is viewed like homogeneous and infinite. The measured Cij represent the effective complex viscoelastic constants of orthotopic and symmetric laminates at that frequencies.