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

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1993
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Hosten, Bernard
Castaings, Michel
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Review of Progress in Quantitative Nondestructive Evaluation
Center for Nondestructive Evaluation

Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.

This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.

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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.

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Fri Jan 01 00:00:00 UTC 1993