Ultrasonic performance of the PVDF thin film sensors under thermal fatigue

Vivek T. Rathod; D. Roy Mahapatra; Anjana Jain; A. Gayathri

doi:10.1117/12.917603

28 March 2012 Ultrasonic performance of the PVDF thin film sensors under thermal fatigue

Vivek T. Rathod, D. Roy Mahapatra, Anjana Jain, A. Gayathri

Proceedings Volume 8342, Behavior and Mechanics of Multifunctional Materials and Composites 2012; 83420E (2012) https://doi.org/10.1117/12.917603
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2012, San Diego, California, United States

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 ( β-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.

Citation Download Citation

Vivek T. Rathod, D. Roy Mahapatra, Anjana Jain, and A. Gayathri "Ultrasonic performance of the PVDF thin film sensors under thermal fatigue", Proc. SPIE 8342, Behavior and Mechanics of Multifunctional Materials and Composites 2012, 83420E (28 March 2012); https://doi.org/10.1117/12.917603

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