Ultrasonic performance of the PVDF thin film sensors under thermal fatigue

Rathod, Vivek T and Mahapatra, Roy D and Jain, Anjana and Gayathri, A (2012) Ultrasonic performance of the PVDF thin film sensors under thermal fatigue. In: Conference on Behavior and Mechanics of Multifunctional Materials and Composites, MARCH 12-15, 2012 , San Diego, CA, USA.

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Abstract

In the present work, the ultrasonic strain sensing performance of the large area PVDF thin film subjected to the thermal fatigue is studied. The PVDF thin film is prepared using hot press and the piezoelectric phase (beta-phase) has been achieved by thermo-mechanical treatment and poling under DC field. The sensors used in aircrafts for structural health monitoring applications are likely to be subjected to a wide range of temperature fluctuations which may create thermal fatigue in both aircraft structures and in the sensors. Thus, the sensitivity of the PVDF sensors for thermal fatigue needs to be studied for its effective implementation in the structural health monitoring applications. In present work, the fabricated films have been subjected to certain number of thermal cycles which serve as thermal fatigue and are further tested for ultrasonic strain sensitivity at various different frequencies. The PVDF sensor is bonded on the beam specimen at one end and the ultrasonic guided waves are launched with a piezoelectric wafer bonded on another end of the beam. Sensitivity of PVDF sensor in terms of voltage is obtained for increasing number of thermal cycles. Sensitivity variation is studied at various different extent of thermal fatigue. The variation of the sensor sensitivity with frequency due to thermal fatigue at different temperatures is also investigated. The present investigation shows an appropriate temperature range for the application of the PVDF sensors in structural health monitoring.

Item Type:	Conference Proceedings
Series.:	Proceedings of SPIE
Publisher:	SPIE-INT SOC OPTICAL ENGINEERING
Additional Information:	Conference on Behavior and Mechanics of Multifunctional Materials and Composites, San Diego, CA, MAR 12-15, 2012
Keywords:	PVDF film; Thermal;Fatigue;Ultrasonic;Piezoelectricity;Lamb wave
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	30 Jun 2012 07:57
Last Modified:	14 Jul 2012 07:33
URI:	http://eprints.iisc.ac.in/id/eprint/44708

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