Ultrasonic performance of the PVDF thin film sensors under thermal fatigue

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

doi:10.1117/12.917603

Cited by 6 publications

(7 citation statements)

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“…PVDF films and piezoceramic coatings are the piezoelectric materials that are extensively being used as thin film piezoelectric sensors [26][27][28][29]. PVDF films can readily be embedded in the composite laminate during fabrication due to its flexibility, whereas the piezoceramic coatings have been typically coated on the structural surface and it has not been embedded.…”

Section: Methodsmentioning

confidence: 99%

Strength and fatigue life evaluation of composite laminate with embedded sensors

Rathod

Hiremath

Mahapatra

2014

Smart Sensor Phenomena, Technology, Networks, and Systems Integration 2014

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Prognosis regarding durability of composite structures using various Structural Health Monitoring (SHM) techniques is an important and challenging topic of research. Ultrasonic SHM systems with embedded transducers have potential application here due to their instant monitoring capability, compact packaging potential toward unobtrusiveness and noninvasiveness as compared to non-contact ultrasonic and eddy current techniques which require disassembly of the structure. However, embedded sensors pose a risk to the structure by acting as a flaw thereby reducing life. The present paper focuses on the determination of strength and fatigue life of the composite laminate with embedded film sensors like CNT nanocomposite, PVDF thin films and piezoceramic films. First, the techniques of embedding these sensors in composite laminates is described followed by the determination of static strength and fatigue life at coupon level testing in Universal Testing Machine (UTM). Failure mechanisms of the composite laminate with embedded sensors are studied for static and dynamic loading cases. The coupons are monitored for loading and failure using the embedded sensors. A comparison of the performance of these three types of embedded sensors is made to study their suitability in various applications. These three types of embedded sensors cover a wide variety of applications, and prove to be viable in embedded sensor based SHM of composite structures.

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Section: Methodsmentioning

confidence: 99%

Strength and fatigue life evaluation of composite laminate with embedded sensors

Rathod

Hiremath

Mahapatra

2014

Smart Sensor Phenomena, Technology, Networks, and Systems Integration 2014

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“…The strain of the guided wave can be measured using a piezoelectric wafer of known properties as elaborated in Refs. 30,31 . The disadvantage of using a piezoelectric sensor to measure strain is the error caused due to its resonance and its bonding layer.…”

Section: Estimation Of Directional Dependent Piezoelectric Coeffecienmentioning

confidence: 97%

“…A guided wave technique to estimate the piezoelectric coefficient 31 e at any frequency as discussed in Refs. [29][30][31] is extended for the estimation for the piezoelectric coefficient 11 e in present work. Method of preparation of these large-area IDE-PVDF and their basic characterization studies are reported in Sec.…”

Section: Introductionmentioning

confidence: 99%

“…Using the technique of guided waves as reported in Ref. 30 , piezoceramic coating with IDEs was characterized for ultrasonic applications by determining the piezoelectric coefficient 31 e in frequency range of 80-180 kHz 31 . However the directional sensitivity was not analyzed which is a unique property of a piezoelectric sensor with IDEs.…”

Section: Introductionmentioning

confidence: 99%

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Ultrasonic guided wave sensing properties of PVDF thin film with inter digital electrodes

Rathod

Mahapatra

2014

Smart Sensor Phenomena, Technology, Networks, and Systems Integration 2014

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Ultrasonic strain sensing performance of the large area PVDF with Inter Digital Electrodes (IDE) is studied in this work. Procedure to obtain IDE on a beta-phase PVDF is explained. PVDF film with IDE is bonded on a plate structure and is characterized for its directional sensitivity at different frequencies. Guided waves are induced on the IDE-PVDF sensor from different directions by placing a piezoelectric wafer actuator at different angles. Strain induced on the IDE-PVDF sensor by the guided waves in estimated by using a Laser Doppler Vibrometer (LDV) and a wave propagation model. Using measured voltage response from IDE-PVDF sensor and the strain measurements from LDV the piezoelectric coefficient is estimated in various directions. The variation of 11 e at different angles shows directional sensitivity of the IDE-PVDF sensor to the incident guided waves. The present study provides an effective technique to characterize thin film piezoelectric sensors for ultrasonic strain sensing at very high frequencies of 200 kHz. Often frequency of the guided wave is changed to alter the wavelength to interrogate damages of different sizes in Structural Health Monitoring (SHM) applications. The unique property of directional sensitivity combined with frequency tunability makes the IDE-PVDF sensor most suitable for SHM of structures.

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“…any frequency as discussed inRefs 40,41 which is extended for the estimation for the piezoelectric coefficient11 e for the piezoceramic coating with IDT electrodes in present work. Method of preparation of these large-area piezoceramic coating and their basic characterization studies are reported in Sec.…”

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confidence: 98%

Large-area piezoceramic coating with IDT electrodes for ultrasonic sensing applications

et al. 2013

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In the present paper, the ultrasonic strain sensing performance of large-area piezoceramic coating with Inter Digital Transducer (IDT) electrodes is studied. The piezoceramic coating is prepared using slurry coating technique and the piezoelectric phase is achieved by poling under DC field. To study the sensing performance of the piezoceramic coating with IDT electrodes for strain induced by the guided waves, the piezoceramic coating is fabricated on the surface of a beam specimen at one end and the ultrasonic guided waves are launched with a piezoelectric wafer bonded on another end. Often a wider frequency band of operation is needed for the effective implementation of the sensors in the Structural Health Monitoring (SHM) of various structures, for different types of damages. A wider frequency band of operation is achieved in the present study by considering the variation in the number of IDT electrodes in the contribution of voltage for the induced dynamic strain. In the present work, the fabricated piezoceramic coatings with IDT electrodes have been characterized for dynamic strain sensing applications using guided wave technique at various different frequencies.Strain levels of the launched guided wave are varied by varying the magnitude of the input voltage sent to the actuator. Sensitivity variation with the variation in the strain levels of guided wave is studied for the combination of different number of IDT electrodes. Piezoelectric coefficient 11 e is determined at different frequencies and at different strain levels using the guided wave technique.

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Ultrasonic performance of the PVDF thin film sensors under thermal fatigue

Cited by 6 publications

References 0 publications

Strength and fatigue life evaluation of composite laminate with embedded sensors

Strength and fatigue life evaluation of composite laminate with embedded sensors

Ultrasonic guided wave sensing properties of PVDF thin film with inter digital electrodes

Large-area piezoceramic coating with IDT electrodes for ultrasonic sensing applications

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