Investigation of the R260 Rail Steel Behavior at Varying Temperatures by EMI Method

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JOURNAL OF POLYTECHNIC-POLITEKNIK DERGISI, vol.22, no.4, pp.955-960, 2019 (ESCI) identifier


In recent years, Electromechanical Impedance (EMI) method has been widely used in structural health monitoring (SHM). In this method, lead zirconate titanate (PZT) ceramic sensor patch is added to the structure to be monitored for structural health. Impedance and admittance characteristics are measured using an impedance analyzer, which forms the reference characteristic in the evaluation of structural health. It is expected that these characteristics will not change as long as there is no change in the structure. However, it is known that these characteristics change in some situations, such as exposure to external environmental conditions and temperature fluctuations. If the effect of temperature is not taken into account, it leads to misinterpretations as if there were faults in the structure. Rails are exposed to changing environmental conditions continuously. In this study, the behavior of the R260 rail steel at varying temperatures is investigated using the EMI method. As a result of the experimental studies, it has been observed that frequency and amplitude change with decreasing temperature. This change has been interpreted using damage metrics.