Piezoelectric Transducer for Monitoring Civil Infrastructures

Information about Piezoelectric Transducer for Monitoring Civil Infrastructures

Published on July 19, 2014

Author: ashifar

Source: authorstream.com

Content

PIEZOELECTRIC TRANSDUCERS FOR ASSESSING AND MONITORING CIVIL INFRASTRUCTURES: PIEZOELECTRIC TRANSDUCERS FOR ASSESSING AND MONITORING CIVIL INFRASTRUCTURES ASHIF A.R S7CA CLASS NO. : 13 M.A.COLLEGE OF ENGINEERING KOTHAMANGALAM 1 CONTENTS: CONTENTS INTRODUCTION PIEZOELECTRIC TRANSDUCERS BONDING S.H.M TECHNIQUES APPLICATIONS CONCLUSION REFERENCES 2 INTRODUCTION: INTRODUCTION Direct piezoelectric effect Converse piezoelectric effect 3 PIEZOELECTRIC TRANSDUCERS: PIEZOELECTRIC TRANSDUCERS Natural Materials – Quartz(SiO 2 ) and Rochelle salt (NaKC 4 H 4 O 6–4 H 2 O) Lead Zirconate Titanate (PZT) (PbZrTiO 3 ) Macro-fiber composite (MFC) Active fiber composite (AFC) Polyvinylidene fluoride (PVDF) Smart aggregate-Piezoceramic device 4 PowerPoint Presentation: 5 Bonding: Bonding 6 SHM TECHNIQUES: SHM TECHNIQUES Guided wave techniques Impedance techniques Acoustic emission techniques Piezoelectric transducer self-diagnosis techniques 7 Guided wave techniques: 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 8 Guided wave techniques: Guided wave techniques 9 Impedance techniques: 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 10 Impedance techniques: 11 Impedance techniques Acoustic emission techniques: 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 12 Acoustic emission techniques: Acoustic emission techniques 13 Piezoelectric transducer self-diagnosis techniques: Piezoelectric transducer self-diagnosis techniques 14 TRP-based PZT debonding detection procedure Applications: Applications Bridge Structures Pipeline structures Nuclear power plants 15 CONCLUSION: 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. 16 REFERENCES: 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” 17 PowerPoint Presentation: 18 THANK YOU

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