24 August 2000 Piezoelectric transducer network for dual-mode (active/passive) detection, localization, and evaluation of impact damages in carbon/epoxy composite plates
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Proceedings Volume 4073, Fifth European Conference on Smart Structures and Materials; (2000); doi: 10.1117/12.396391
Event: Symposium on Applied Photonics, 2000, Glasgow, United Kingdom
Abstract
The feasibility of an integrated system for permanent detection and estimation of damaging impacts on composite plates has been evaluated. This system is based on the existence, during a damaging impact, of an intense acoustic emission in the high frequency range. This acoustic emission is registered by a network of piezoelectric sensors and is used to obtain estimations of the location of damaging impacts and estimations of damage areas. Experiments have been carried out with carbon-epoxy plates equipped with four small and thin disc-shaped piezoelectric sensors. Each plate has been impacted using a weight drop machine equipped with a Boeing window. The impact energy varies from 2 J to 6 J for 16 plies coupons and from 4 J to 8 J for 32 plies coupons. The procedure used to identify the damage as a noise source from the signals received by the sensors allows to localize them with an accuracy of a few centimeters. It is also possible to obtain a nearly linear relation between the amplitude of the identified noise source and the projected area of the damage. It is then possible to estimate the damage area in a plate from the amplitude of the noise source after a calibration of the sensors of a reference plate.
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Daniel L. Osmont, Marc Dupont, Remi Gouyon, Michel B. Lemistre, Daniel L. Balageas, "Piezoelectric transducer network for dual-mode (active/passive) detection, localization, and evaluation of impact damages in carbon/epoxy composite plates", Proc. SPIE 4073, Fifth European Conference on Smart Structures and Materials, (24 August 2000); doi: 10.1117/12.396391; https://doi.org/10.1117/12.396391
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KEYWORDS
Composites

Sensors

Transducers

Acoustics

Acoustic emission

Calibration

Wave propagation

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