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Proceedings Paper

Nonlinear thermosonics and laser vibrometry for barely visible impact damage of a composite stiffener panel
Author(s): Gian Piero Malfense Fierro; Dmitri Ginzburg; Francesco Ciampa; Michele Meo
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Paper Abstract

Two methods have been evaluated in order to locate barely visible impact damage (BVID) in a composite stiffener panel. A nonlinear thermosonics technique and a nonlinear laser vibrometer technique were evaluated. Damaged regions were excited using a piezo shaker in both methods. Evaluation of the damaged regions was done by first determining the second and third order nonlinear harmonic response of the damaged regions. This was then used to determine the excitation frequency. By evaluating the presence of nonlinear responses in the output signal it is possible to excite the damaged structure at frequencies that give high heat generation and high displacements at the damaged regions. The results showed that both methods can be used to locate damaged regions, although it was shown that the stiffener impedes the propagation of the exciting wave and that these tests should be carried out in-between stiffeners in order to maximise the excitation and heating of damaged regions. Furthermore, both methods allowed for excitation of damaged regions over a large area.

Paper Details

Date Published: 22 April 2016
PDF: 9 pages
Proc. SPIE 9804, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016, 980419 (22 April 2016); doi: 10.1117/12.2220418
Show Author Affiliations
Gian Piero Malfense Fierro, Univ. of Bath (United Kingdom)
Dmitri Ginzburg, Univ. of Bath (United Kingdom)
Francesco Ciampa, Univ. of Bath (United Kingdom)
Michele Meo, Univ. of Bath (United Kingdom)


Published in SPIE Proceedings Vol. 9804:
Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016
Tzuyang Yu; Andrew L. Gyekenyesi; Peter J. Shull; H. Felix Wu, Editor(s)

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