Ferroelectric Ceramic/Polymer Bimorph Sensor for Strain Measurement in Laminates
WALES UNIV BANGOR (UNITED KINGDOM) SCHOOL OF ELECTRONIC ENGINEERING AND COMPUTER SYSTEMS
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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 PVDF- 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.
- Polymer Chemistry
- Electrical and Electronic Equipment
- Ceramics, Refractories and Glass