Study on electromechanical impedance characteristics of part of structures made of CFRP

Paweł H. Malinowski; Tomasz Wandowski; Wiesław M. Ostachowicz

doi:10.1117/12.2218816

1 April 2016 Study on electromechanical impedance characteristics of part of structures made of CFRP

Paweł H. Malinowski, Tomasz Wandowski, Wiesław M. Ostachowicz

Proceedings Volume 9805, Health Monitoring of Structural and Biological Systems 2016; 98051R (2016) https://doi.org/10.1117/12.2218816
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2016, Las Vegas, Nevada, United States

Abstract

Carbon Fibre Reinforced Polymers (CFRP) are more and more used in many branches of industry. Researchers are developing numerous techniques of non-destructive assessment of the structures made out of CFRP such as guided waves, ultrasonics, laser induced fluorescence and others. In this research we focus on electromechanical impedance (EMI) technique. In this technique a piezoelectric sensor is either surface mounted or embedded into investigated host structure. The electrical quantities of the sensor are measured for wide frequency range. Due to piezoelectric effect the electrical response of the sensor is related to mechanical response of the structure to which the sensors is bonded to. In the reported research impedance spectra in the vicinity of the transducer thickness mode were investigated as well as the lower frequency range. The spectra that were analysed were gathered from samples with surface treatment such as thermal degradation and samples adhesively bonded with film adhesive with symmetric and unsymmetric bond. Moreover, the samples with modified adhesive bonds were investigated. These spectra for different cases were compared with reference measurement results gathered from pristine samples. Numerical indexes for comparison of the EMI characteristics were proposed. The comparison of the indexes was also conducted. In the experimental part of the research the piezoelectric transducer was mounted at the sample surface. Measurements were conducted using HIOKI Impedance Analyzer IM3570.

Citation Download Citation

Paweł H. Malinowski, Tomasz Wandowski, and Wiesław M. Ostachowicz "Study on electromechanical impedance characteristics of part of structures made of CFRP", Proc. SPIE 9805, Health Monitoring of Structural and Biological Systems 2016, 98051R (1 April 2016); https://doi.org/10.1117/12.2218816

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KEYWORDS

Contamination

Adhesives

Sensors

Nondestructive evaluation

Transducers

Silicon

Analytical research

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