Static Stress Identification Using Electromechanical Impedance of Piezoelectric Plates

Piezoelectric transducers are widely used in the field of structural health monitoring. However, the existing health monitoring technology based on piezoelectric transducers can only achieve dynamic stress monitoring or damage identification. Currently, the research of piezoelectric transducers utilized in the quantitative monitoring of static stress is rarely studied. In this study, for the first time, the electromechanical impedance of piezoelectric transducers is utilized in static stress identification. For the purpose of monitoring static stress, the impedance characteristics are employed to identify the initial stress applied on the piezoelectric transducers based on the nonlinear dynamic model of piezoelectric transducers under the action of initial stress. This paper mainly provides theoretical basis of static stress identification using electromechanical impedance of piezoelectric plates.