A continuum based modelling approach for adhesively bonded piezo-transducers for EMI technique

Moharana, Sumedha; Bhalla, Suresh

doi:10.1016/j.ijsolstr.2013.12.022

Cited by 32 publications

(26 citation statements)

References 27 publications

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“…EMI is complimentary to guided wave ultrasonics and is applied in either of two ways, the first as a method of assessing local area structural health, the second as a method of quickly assessing the state of health of the piezoelectric transducer based SHM system. For both applications an initial assessment is made of a healthy system, this is then used as a baseline reference ( (Moharana and Bhalla, 2014), p1299) against which future assessments are compared.…”

Section: Electromechanical Impedancementioning

confidence: 99%

“…EMI is sensitive to; changes to structure bondlines ((AlOstaz et al, 2007), p348), changes in the thickness of the bondline between the structure and the transducer ( (Qing et al, 2006a), p622), changes to adhesive tensile modulus ( (Qing et al, 2006a), p625) and changes to adhesive shear modulus (Moharana and Bhalla, 2014). For sensor health assessment the technique has been shown to be capable of detecting debonding in the adhesive layer between a transducer and the host structure and degradation of the PZT element itself (Park et al, 2006).…”

Section: Electromechanical Impedancementioning

confidence: 99%

“…Two examples of recent work are by Dugnani (2009) to develop the analysis for 3D disc transducers and by Moharana and Bhalla (2014) who with their continuum model for square shaped transducers developed a more accurate and realistic shear lag model (incorporating shear stress and inertia force). Dugnani (2009), (p1563) shows that for "disc shaped sensors the effect of the adhesive layer is frequency dependent" with shear deformation losses near the first radial resonance lower than predicted by quasi-static models.…”

Section: Electromechanical Impedancementioning

confidence: 99%

“…Summaries and details of the historical development of the method can be found in Park and Sohn (2003), Park et al (2006), Dugnani (2009, Soh et al (2012), Dugnani (2013), and Moharana and Bhalla (2014).…”

Section: Electromechanical Impedancementioning

confidence: 99%

“…"The electromechanical coupling between PZT transducers and the structure is strongly affected by partial debonding and this effect is influenced by the actuation frequency with respect to the natural resonance frequency", ( (Lanzara et al, 2009), p1700). Moharana and Bhalla (2014) have shown that bond layer damping and inertia ( (Moharana and Bhalla, 2014), pp.1306-1308) have negligible effect on admittance signatures. And that the PZT dielectric loss factor has a significant effect on conductance but negligible effect on susceptance ( (Moharana and Bhalla, 2014), p1307).…”

Section: Electromechanical Impedancementioning

confidence: 99%

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Investigation of the effects of structure-sensor interaction on piezoceramic transducers for structural health monitoring applications

Favier¹

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Surface bonded piezoceramic transducers used for structural health monitoring that are subjected to high strain loading are at risk of being compromised by damage to the attaching bond line or to the piezoceramic sensing element. In consequence, when baseline sensor data for a healthy structure is compared to subsequent data obtained from damaged sensors, incorrect assessment of the state of the structure may occur.This project investigated and developed a novel method of attaching piezoceramic transducers to specially prepared thermoset composite surfaces using functional thermoplastic surfaces as bond line media with the aim to improve the protection of the transducer from the damaging effects of high strain structural loading.To evaluate the effectiveness of this new approach, the fatigue performance of thermoplastic weld bonded and cyanoacrylate adhesive bonded transducers were compared.Finite element analysis (FEA) of transducer-bondline-structure models showed that strain transfer from the structure to the piezoceramic element reduced as bond layer thickness increased or as the bond layer modulus decreased. The simulations indicated that within each material layer shear strain changes gradually and the rate of change is different for each material type. At dissimilar material interface boundaries shear strain has a common value but the change gradient differences within each material mean the interface is a likely location for transducer failure.For cyanoacrylate and thermoplastic bonding systems the availability of published data regarding bond strength is limited. Static tensile testing was undertaken to generate some of the bond strength data for different bond layer thicknesses and a range of surface roughness. The data showed that tensile bond strength increased with decreasing adhesive layer thickness and that for the range of surface roughness tested the relative performance of each bond line thickness was similar.To further examine the performance of the two different bonding systems, fatigue testing was undertaken. The relative performance of each system was compared using transducer output voltage and impedance data. Specimens were fabricated by bonding 10 mm diameter, 1 mm thick silver electroded piezoceramic transducers to appropriately ii prepared thermoset composite test coupons. Test samples were subjected to sinusoidal loading at 5 Hz and maximum strains of 1000 µɛ, and 2000 µɛ or 3000 µɛ.For both bond types, sensor voltage output showed an initial period of rapid decrease in amplitude before typically settling at an approximate steady state output. The lower voltage output from the thermoplastic bonded transducers indicated that the thermoplastic bond lines reduced strain transfer between the host structure and the piezoceramic sensing element.The fatigue test results showed that polyvinylidene fluoride (PVDF) bonded transducers experienced a reduced or similar decrease in performance relative to the cyanoacrylate bonded transducers for the same number of load cycles and strain ran...

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Section: Electromechanical Impedancementioning

confidence: 99%

Section: Electromechanical Impedancementioning

confidence: 99%

Section: Electromechanical Impedancementioning

confidence: 99%

Section: Electromechanical Impedancementioning

confidence: 99%

Section: Electromechanical Impedancementioning

confidence: 99%

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Investigation of the effects of structure-sensor interaction on piezoceramic transducers for structural health monitoring applications

Favier¹

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2016

Piezoelectric Materials

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Sustainability analysis of sandstone using smart material by EMI approach

Kharwar

Rawat

Srivastava³

2023

Environ Sci Pollut Res

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In India, sandstone was broadly used to construct structures like Agra fort, Red Fort Delhi and Allahabad fort, 13 etc. Around the world, many historical structures were collapsed due to the adverse effect of damages. Structural 14 health monitoring (SHM) is very useful to take appropriate action against the failure of structure. The Electro-15 mechanical impedance (EMI) technique is used to continuously monitor the damage. This technique is helped to 16 analyse the hairline crack, location, and severity of damage to structural elements. A 10cm length and 5cm 17 diameter sandstone cylinder was used in experimental work. A cutter was used to create the artificial damages 18 of 2mm, 3mm, 4mm, and 5mm respectively along the length, at the same place in specimens. The signature was 19 measured for each depth of damage between 30 kHz to 400 kHz frequency range. The comparative result of 20 healthy and damages state with different depth was concluded base on EMI signature form the sample. RMSD 21 Statistical methods like root mean square deviation (RMSD) is used for quantification of damage. This paper 22 motivates the application of the EMI technique to the historical building made of sand stone as key material.

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A continuum based modelling approach for adhesively bonded piezo-transducers for EMI technique

Cited by 32 publications

References 27 publications

Investigation of the effects of structure-sensor interaction on piezoceramic transducers for structural health monitoring applications

Investigation of the effects of structure-sensor interaction on piezoceramic transducers for structural health monitoring applications

References

Sustainability analysis of sandstone using smart material by EMI approach

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