Piezoelectric materials being used for the structural health monitoring of structures, is a fast developing field and has vital applications in bridge structures, nuclear plants etc..

1. PIEZOELECTRIC TRANSDUCERS
FOR ASSESSING AND
MONITORING CIVIL
INFRASTRUCTURES
ASHIF A.R
S7CA
CLASS NO. : 13
M.A.COLLEGE OF ENGINEERING
KOTHAMANGALAM
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2. CONTENTS
• INTRODUCTION
• PIEZOELECTRIC TRANSDUCERS
• BONDING
• S.H.M TECHNIQUES
• APPLICATIONS
• CONCLUSION
• REFERENCES
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3. INTRODUCTION
• Direct piezoelectric effect
• Converse piezoelectric effect
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4. PIEZOELECTRIC TRANSDUCERS
• Natural Materials – Quartz(SiO2) and
Rochelle salt (NaKC4H4O6–4H2O)
• Lead Zirconate Titanate (PZT) (PbZrTiO3)
• Macro-fiber composite (MFC)
• Active fiber composite (AFC)
• Polyvinylidene fluoride (PVDF)
• Smart aggregate-Piezoceramic device
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6. Bonding
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7. SHM TECHNIQUES
• Guided wave techniques
• Impedance techniques
• Acoustic emission techniques
• Piezoelectric transducer self-diagnosis
techniques
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8. Guided wave techniques
• Pulse–echo mode & Pitch–catch mode
• Guided waves, defined as elastic waves
confined by the boundaries of a structure
• Scattering, reflection, and mode
conversion
• Sensitive to environmental and operational
variation
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9. Guided wave techniques
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10. Impedance techniques
• Electromechanical impedance signal
• Applying an electric voltage to PZT and
measuring the corresponding output
current
• Good for local damage detection in
complex structures
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Impedance techniques

12. Acoustic emission techniques
• ‘Transient elastic stress waves produced
by a release of energy from a localized
source’
• Elastic waves propagating through the
target surface
• Converted to voltage signals by an AE
sensor
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13. Acoustic emission techniques
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14. Piezoelectric transducer self-
diagnosis techniques
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TRP-based PZT debonding detection procedure

15. Applications
• Bridge Structures
• Pipeline structures
• Nuclear power plants
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16. CONCLUSION
• The nonintrusive nature, low cost, light
weight, and good repeatability of the
piezoelectric transducers make them
attractive for SHM applications
• Future researches on miniaturization,
increased flexibility, and applications
under high-temperature, high-strain, and
high-radiation environments.
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17. REFERENCES
• Journal “Sensor Technologies for Civil
Infrastructures”, 2014, Page 86 - 120
Piezoelectric transducers for assessing
and monitoring civil infrastructures by
Y.-K. An, M.K. Kim and H. Sohn
• Journal NDT&E International, Article
“Combined embedded and surface
bonded piezoelectric transducer for
monitoring concrete structures”
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