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Temperature Independent Damage Detection in Plates Using Redundant Signal Measurements

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Abstract

This paper describes a method to detect notch like damages in plates using piezoelectric transducers. The method does not use prior baseline data for damage detection. A single pair of piezoelectric wafer transducers made of Lead Zirconate Titanate (PZT) is attached back to back on the opposite sides of a plate and are used for simultaneous actuation and sensing. A notch, which is a sudden change in thickness of the plate, leads to mode conversion of Lamb waves. The mode converted wave component in the measured signal is then separated from the other Lamb wave mode components using polarization characteristics of the piezoelectric wafer transducers. The damage index is a function of the amplitude of this mode converted component of the signal. In real world situations, the damage index will not be exactly zero due to inaccuracy in transducer collocation and non-uniformity in their bonding conditions. Therefore, a (non-zero) threshold for the damage index needs to be established to avoid false alarms. True to the spirit of baseline-free damage detection, this threshold is computed from the signals acquired only from the current state of the structure. This is achieved by using redundancy in signal measurements. Since the method detects damages without having to rely on baseline data, environmental variations like temperature change do not affect its performance. Results from numerical simulations as well as experiments on aluminum specimens are provided to demonstrate the effectiveness of the method described above.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea

    Hoon Sohn & Yun-Kyu An

  2. Department of Civil and Environmental Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA, 15213, USA

    Debaditya Dutta

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  1. Hoon Sohn
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  2. Debaditya Dutta
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  3. Yun-Kyu An
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Correspondence to Debaditya Dutta.

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Sohn, H., Dutta, D. & An, YK. Temperature Independent Damage Detection in Plates Using Redundant Signal Measurements. J Nondestruct Eval 30, 106–116 (2011). https://doi.org/10.1007/s10921-011-0096-6

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  • DOI: https://doi.org/10.1007/s10921-011-0096-6

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