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Proceedings Paper

Manufacturing of artificial sub-surface cracks to investigate non-linear features of electro-mechanical impedance measurements
Author(s): Christoph Kralovec; Thomas Erlinger; Sandra Gschossmann; Martin Schagerl
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Paper Abstract

The electro-mechanical impedance method is a standard SHM approach. The method evaluates the dynamic frequency response of a structure to harmonic excitation. Both excitation and measurement are done by a piezoelectric element. This contribution presents a manufacturing process to generate sub-surface cracks in metallic beams with an opening small enough to create non-linear response to harmonic excitation. The generated simple beam with sub-surface crack is analyzed by means of vibration measurements by a piezoelectric element and a Laser-Scanning-Vibrometer, linear and non-linear FE analysis and microscopic images. Challenges in the measurement of non-linear response signals are revealed and needed further enhancement of the manufacturing process is presented. The non-linear dynamic response signal calculated by the non-linear FE analysis is presented and discussed regarding the detection and parameter identification of sub-surface cracks typical for composite delamination or sandwich debonding by the electro-mechanical impedance method.

Paper Details

Date Published: 27 March 2018
PDF: 11 pages
Proc. SPIE 10599, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XII, 105990S (27 March 2018); doi: 10.1117/12.2296598
Show Author Affiliations
Christoph Kralovec, Johannes Kepler Univ. Linz (Austria)
Thomas Erlinger, Johannes Kepler Univ. Linz (Austria)
Sandra Gschossmann, Johannes Kepler Univ. Linz (Austria)
Martin Schagerl, Johannes Kepler Univ. Linz (Austria)


Published in SPIE Proceedings Vol. 10599:
Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XII
Peter J. Shull, Editor(s)

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