Ferroelectric Ceramic/Polymer Bimorph Sensor for Strain Measurement in Laminates

Abstract

In-situ acoustic emission (AE) sensors have been developed from an initial concept through to their application in detecting Lamb waves in laminate plates. Composite piezoelectric sensors have been fabricated from Calcium modified lead titanate (PTCa) and two polymer matrices (i.e., polar polyvinylidenefluoride-trifluoro-ethylene P(VDF- TrFE) and a nonpolar epoxy with a mixed 0-3 and 1-3 connectivity. Their dielectric and electroactive (i.e., piezoelectric) and other acoustic properties have been characterized. The applicability of these materials for use in surface mounted AE sensors has been investigated and their performance has been found to be compatible with those of a commercially available electroceramic sensor. Sensors of monomorph and bimorph design were embedded in unidirectional glass fibre reinforced epoxy plates and were seen to be capable of detecting and distinguishing between the extensional and flexural plate-wave modes of propagation.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1998
Accession Number
ADA339163

Entities

People

  • Dilip K. Das-Gupta

Organizations

  • Bangor University

Tags

Communities of Interest

  • Advanced Electronics
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustics
  • Chemical Synthesis
  • Chemistry
  • Dielectric Permittivity
  • Dielectric Properties
  • Electromagnetic Fields
  • Fiber Reinforced Composites
  • Fiber Reinforced Polymers
  • Laminates
  • Material Degradation Processes
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Piezoelectricity
  • Resonant Frequency

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Optical Fiber Sensing and Electromagnetic Propagation.
  • Reinforced Composite Materials