Influence of delamination and temperature conditions on electromechanical impedance
Abstract »This paper focuses on damage detection in composite materials under temperature influence. Damage detection was based on electromechanical impedance method (EMI). This method uses a piezoelectric transducer to excite the structure and sense the response. Frequency spectra of electrical quantities are registered. Damage presence or external factors influence the shape of these spectra. In this paper result of detection and localization of artificially initiated delaminations in carbon fibre reinforced polymer CFRP samples are presented. Delamination causes frequency shift of certain resonance frequencies visible in resistance characteristic. In this paper temperature effects on EMI method are investigated. The problem of temperature influence and its compensation is addressed. An algorithm is proposed in order to compensate the temperature induced effects. Results show that temperature change causes frequency shifts. Moreover this frequency shifts are not constant, therefore the compensation needs to be performed in narrow frequency bands. Results shown that application of temperature compensation algorithm improved EMI method sensitivity to damage. Moreover results show that sensitivity to damage depends on frequency range.
Biography: 2005 M.Sc. in Physics, 2011 Ph.D. in Mechanics.
His current scientific interest is mainly focused on:
Guided wave-based damage localisation in aircraft components,
Signal processing algorithms for damage detection and localisation,
Phased arrays techniques for Lamb-wave based Structural Health Monitoring,
NDT methods for surface contamination and weak adhesive bonds evaluation of CFRP,
Electromechanical impedance technique,
Terahertz NDT technique,
Damage detection methods for wind turbines
Affiliation: Institute of Fluid-Flow Machinery, Polish Academy of Sciences 80-231 Gdansk Poland