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Technical Brief

Simultaneous Influence of Static Load and Temperature on the Electromechanical Signature of Piezoelectric Elements Bonded to Composite Aeronautic Structures

[+] Author and Article Information
Marc Rebillat

PIMM Laboratory,
Arts et Metiers/CNRS/CNAM,
Paris 75013, France
e-mail: marc.rebillat@ensam.eu

Mikhail Guskov, Etienne Balmes, Nazih Mechbal

PIMM Laboratory,
Arts et Metiers/CNRS/CNAM,
Paris 75013, France

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received July 3, 2015; final manuscript received July 28, 2016; published online September 30, 2016. Editor: I. Y. (Steve) Shen.

J. Vib. Acoust 138(6), 064504 (Sep 30, 2016) (6 pages) Paper No: VIB-15-1244; doi: 10.1115/1.4034375 History: Received July 03, 2015; Revised July 28, 2016

Electromechanical (EM) signature techniques have raised a huge interest in the structural health-monitoring community. These methods aim at assessing structural damages and sensors degradation by analyzing the EM responses of piezoelectric components bonded to aeronautic structures. These structures are subjected simultaneously to static loads and temperature variations that affect the metrics commonly used for damage detection and sensor diagnostics. However, the effects of load and temperature on these metrics have mostly been addressed separately. This paper presents experimentations conducted to investigate the simultaneous influence of static load and temperature on these metrics for two kinds of piezoelectric elements (lead zirconate titanate (PZT) and macrofiber composite (MFC)) bonded on sandwich composite materials, for the full range of real-life conditions encountered in aeronautics. Results obtained indicate that both factors affect the metrics in a coupled manner in particular due to the variations of the mechanical properties of the bonding layer when crossing its glass transition temperature. Furthermore, both piezoelectric elements globally behave similarly when subjected to temperature variations and static loads. Simultaneous accounting of both temperature and static load is thus needed in practice in order to design reliable structural health-monitoring systems based on these metrics.

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Figures

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Fig. 1

Experimental equipment: (a) bending load configuration, (b) bending test at −60 °C, and (c) experimental setup overview

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Fig. 2

Gradual decoupling of the piezoelectric elements with temperature increase below and above the adhesive glass transition temperature (55 °C): (a) MFC and (b) PZT

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Fig. 3

Influence of simulated damages on the RMSD: (a) MFC and (b) PZT

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Fig. 4

Coupled influence of bending load and temperature on the RMSD for (a) MFC and (b) PZT. Reference resistance at T=30 °C, and ε/ε0=0 indicated by a black star and a vertical temperature line.

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Fig. 5

Coupled influence of bending load and temperature on the static capacity for both piezoelectric elements. The line labeled free corresponds to the case where the piezoelectric elements have not been bonded to their host structure: (a) MFC and (b) PZT.

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