Abstract
In recent years, it is necessary to monitor every civil and mechanical structure for the safety of human life and property. By using PZT, monitoring of structures is possible with some limitations such as direct attachment to the host structure, structure subjected to impact from external forces, inaccessible structure, high temperature locations, and structures with complex geometry and curved surfaces. To overcome these limitations, a new technique is employed for structural health monitoring. Using the advanced technique, transducer is prepared by attaching PZT with metal connectors which is in turn attached to the monitored structure. This paper demonstrates experimental study on mild steel pipes. Different aspects of SHM are studied. The proposed technique effectively detects locations of damages and severity of damages of pipe specimen. The technique is also employed to study effect of temperature variation along with detecting progressive damage of pipe specimen when it is subjected to steady constant high temperature. This technique is applicable to high temperature locations as the temperature of PZT maintained below its Curie temperature by introducing metal connector between structure and PZT patch. For the quantification of damages, the RMSD index formula is used.
Highlights
By using piezoelectric transducer (PZT), monitoring of structures is possible with some limitations such as direct attachment to the host structure, structure subjected to impact from external forces, inaccessible structure, high temperature locations, and structures with complex geometry and curved surfaces
Transducer is prepared by attaching PZT with metal connectors which is in turn attached to the monitored structure
This technique is applicable to high temperature locations as the temperature of PZT maintained below its Curie temperature by introducing metal connector between structure and PZT patch
Summary
Park et al (2000) carried out experimental study on impedance based health monitoring technique for massive structures and high temperature structures using commercial PZT. They showed that method can be successfully applied for massive structures [2]. Na and Lee (2012) presented a technique for selecting Resonance frequency range utilized for damage detection of composite structures Further they worked on Steel wire electromechanical impedance method using a piezoelectric material for composite structures with complex surfaces [4]. In the present investigative study, experimental setups are developed to acquire structural response from the advanced piezoelectric transducer (PZT) patches bonded through the metal connector and to predict the damages by using high frequency technique. The study is performed to understand effect of temperature variation along with detecting progressive damage of pipe specimen
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