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Structural health monitoring based on the electromechanical impedance technique

Grant number: 20/03154-2
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): June 01, 2020
Effective date (End): November 30, 2020
Field of knowledge:Engineering - Mechanical Engineering - Mechanics of Solids
Principal Investigator:Douglas Domingues Bueno
Grantee:Lorena Lopes Dias
Home Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil

Abstract

The development of techniques for structural health monitoring has involved relevant effort from researchers and engineers mainly due to potential gains to many industrial applications. In particular, the Electromechanical Impedance (EMI) approach has been investigated over twenty last years and important results have been achieved especially using signal processing techniques and experimental data. However, influence of physical and geometrical properties of the damage and piezoelectric (PZT) transducers, on damage detection, remains as a important challenge to be overcome to increase the technological readiness level of this approach. In this context, the present research investigates a symmetric damage detection in rod-like structure described by using the Spectral Element method. The mechanical impedance of the PZT transducer is defined in the frequency domain, in terms of its mechanical and electrical properties. EMI curves are obtained for different damage configurations (i.e., different damage length and thickness), also investigating different PZT characteristics. Numerical simulations are carried out.