@inproceedings{c8468b93cd1c49aea864683759897f23,
title = "Nonlinear thermosonics and laser vibrometry for barely visible impact damage of a composite stiffener panel",
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.",
keywords = "BVID, Laser Vibrometer, Nonlinear Ultrasound, Stiffener Panel, Thermography, Thermosonics",
author = "{Malfense Fierro}, {Gian Piero} and Dmitri Ginzburg and Francesco Ciampa and Michele Meo",
year = "2016",
month = apr,
day = "22",
doi = "10.1117/12.2220418",
language = "English",
isbn = "9781510600454",
volume = "9804",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "T. Yu and Gyekenyesi, {A. L.} and Shull, {P. J.} and Wu, {H. F.}",
booktitle = "Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure, 2016",
address = "USA United States",
note = "Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016 ; Conference date: 21-03-2016 Through 24-03-2016",
}