Thermal stress characterization using the impedance-based structural health monitoring system

Abstract

Structural health monitoring (SHM) has attracted researchers' interests for the past two decades to reinforce the maintenance of the aging infrastructure systems all over the world. As one of the potential solutions, the electro-mechanical impedance (EMI) method was introduced in the early 1990s and has a great number of potential applications in the SHM of civil, mechanical and aerospace industries. This paper studied the impedance-based technique with the presence of environmental/operational variability, especially the influences of temperature and uniaxial stress on the admittance signature-based features. A comprehensive analytical model is established and provides satisfactory agreements with the experimental results. The stress and temperature sensitivities of all the proposed features are quantified using the experimental measurements, with discussions on their advantages and disadvantages. The final results illustrate that the EMI method can potentially provide effective measure for thermal stress.

Research on the monitoring friction hysteresis for the bolted interface by electromechanical impedance

“…Considering the high sensitivity to damage, electromechanical impedance is widely used to measure the performance of reinforced concrete [32,33], building structure joints [34], flanges [35], fatigue damage [36], etc reflecting the changes in stiffness, damping and mass distribution of coupled structures, and its time-frequency domain signals are extremely sensitive to structural properties. The research on performance monitoring of prestressed structures using electromechanical impedance can be categorized as follows: (1) characterizing changes in structural performance based on indicators [37][38][39], such as root mean square deviation, peak frequency shift, meanabsolute-percentage deviation, and others. (2) Developing intelligent algorithms based on ultrasonic energy methods [40] and transfer functions [41].…”

Investigation of electromechanical impedance and residual stress relation for samples machined by hot ultrasonic-assisted turning

“…They also found that the imaginary part gave more positive results to understand the change. Zhu et al 11 analyzed the effects of temperatures and stresses on rail steels analytically and experimentally using EMI method. They changed the forces between −20 and 20 ksi and the temperature between 20 and 70° C. They focused on the real and imaginary part of the admittance.…”