Nonlinear thermosonics and laser vibrometry for barely visible impact damage of a composite stiffener panel

Gian Piero Malfense Fierro; Dmitri Ginzburg; Francesco Ciampa; Michele Meo

doi:10.1117/12.2220418

22 April 2016 Nonlinear thermosonics and laser vibrometry for barely visible impact damage of a composite stiffener panel

Gian Piero Malfense Fierro, Dmitri Ginzburg, Francesco Ciampa, Michele Meo

Author Affiliations +

Proceedings Volume 9804, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016; 980419 (2016) https://doi.org/10.1117/12.2220418
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2016, Las Vegas, Nevada, United States

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.

Citation Download Citation

Gian Piero Malfense Fierro, Dmitri Ginzburg, Francesco Ciampa, and Michele Meo "Nonlinear thermosonics and laser vibrometry for barely visible impact damage of a composite stiffener panel", Proc. SPIE 9804, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016, 980419 (22 April 2016); https://doi.org/10.1117/12.2220418

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