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European Workshop on Structural Health Monitoring

EWSHM 2022: European Workshop on Structural Health Monitoring pp 311–322Cite as

Identification of Contact Acoustic Nonlinearities of Subsurface Cracks Located at Free-Edges

Part of the Lecture Notes in Civil Engineering book series (LNCE,volume 253)

Abstract

Structural health monitoring (SHM) is the continuous on-board monitoring of a structure’s condition during operation by integrated systems of sensors. Standard methods of SHM are vibration-based methods like the electromechanical impedance (EMI) method. This method uses a piezoelectric transducer that is attached to a mechanical structure of interest. The transducer is supplied by a harmonic voltage that results in a typically harmonic oscillation of both transducer and structure and allows to monitor the combined dynamic response by measuring the supplied current, and thus, the impedance. Changes of the impedance reflect changes of the structure and can be used to conclude on a potential damage. Today, linear response is typically evaluated by the EMI. Critical damages like delamination in fiber reinforced polymer components could also provoke nonlinear response that might allow more conclusions on the damage. This contribution demonstrates the existence of contact acoustic nonlinearity in an aluminum beam with a free-edge-delamination-like subsurface crack at the end. The investigation is based on transfer frequency response functions between an exciting transducer and out-of-plane surface velocities of the beam measured by laser Doppler scanning vibrometry. For identification of the nonlinear response an identification method is used and verified that is readily published. Furthermore, the diffusion of the nonlinear behavior shall be investigated to conclude on its possible measurement by a transducer that is located at some distance to such a damage.

Keywords

  • Electromechanical impedance
  • Vibration-based
  • Delamination
  • Subsurface crack
  • Damage identification
  • Nonlinear vibration
  • Contact acoustic nonlinearity
  • Transfer frequency response function

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Acknowledgment

This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No. 101006952.

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Authors and Affiliations

  1. Institute of Structural Lightweight Design, Johannes Kepler University Linz, Altenbergerstr. 69, 4040, Linz, Austria

    Christoph Kralovec & Martin Schagerl

Authors
  1. Christoph Kralovec
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  2. Martin Schagerl
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Correspondence to Christoph Kralovec .

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Editors and Affiliations

  1. Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, PA, USA

    Piervincenzo Rizzo

  2. Department of Engineering, University of Palermo, Palermo, Italy

    Alberto Milazzo

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Kralovec, C., Schagerl, M. (2023). Identification of Contact Acoustic Nonlinearities of Subsurface Cracks Located at Free-Edges. In: Rizzo, P., Milazzo, A. (eds) European Workshop on Structural Health Monitoring. EWSHM 2022. Lecture Notes in Civil Engineering, vol 253. Springer, Cham. https://doi.org/10.1007/978-3-031-07254-3_31

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  • DOI: https://doi.org/10.1007/978-3-031-07254-3_31

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