Thermoelastic/Ablatic Laser Generated Ultrasound in Graphite/Polymer Composites Detected with a Cfp-Based System in Reflection Configuration

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1997
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Caron, James
Yang, Yuqiao
Mehl, James
Steiner, Karl
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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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Abstract

A laser-based system was used to study thermoelastic (TE) and ablative (AB) ultrasonic generation mechanisms in graphite/polymer composites. When laser pulses of sufficiently low energy are incident on the sample, elastic waves are generated by the thermal expansion which accompanies absorption of the laser energy. At higher amplitudes, where the laser energy is high enough to melt and vaporize material in the sample, elastic waves are also generated by an ablative process. Thermoelastic and ablative ultrasound generation are described in the literature [1]. A review article by Srinivasan [2] includes excellent photographs of ablation of pure polymers.

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Wed Jan 01 00:00:00 UTC 1997