Experimental investigation of the acousto-ultrasonic transfer characteristics of adhesively bonded piezoceramic transducers

Veidt, Martin; Liu, Tierang; Kitipornchai, S.

doi:10.1088/0964-1726/9/1/303

Cited by 14 publications

(5 citation statements)

References 4 publications

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“…Although special properties of these points have been well known since the early studies of dispersion of guided waves in plates and cylinders, they have been exploited only recently for material characterization and dynamic response studies. Recent experimental studies (Clorennec et al, 2007;Gibson and Popovics, 2005;Holland and Chimenti, 2004;Veidt et al, 2000) have shown that strong resonances occur in plates at frequencies where the group velocities of S 1 and A 2 modes vanish, but the phase velocities have finite values, i.e., the dispersion curves for those modes have minima below the cut-off frequencies. Since the group velocity of such a mode vanishes at the minimum, mechanical energy is trapped and high amplitude standing waves (vibrations) are present.…”

Section: Introductionmentioning

confidence: 99%

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Dispersion of elastic guided waves in piezoelectric infinite plates with inversion layers

Cortés

Datta

Mukdadi

2008

International Journal of Solids and Structures

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a b s t r a c tIn this work, we study the dispersion of elastic waves in piezoelectric infinite plates with ferroelectric inversion layers. The motivation is to analyze the effect of ferroelectric inversion layers on wave dispersion and resonant behavior under impulsive line loads. A semianalytical finite-element (SAFE) method has been adopted to analyze the problem. Two model problems are considered for analysis. In one, the plate is composed of a layer of 36°rotated y-cut LiNbO 3 with a ferroelectric inversion layer. In the other, material is PZT-4 with a ferroelectric inversion layer. Comparison with experimental results, reported in the literature for isotropic materials, shows a very good agreement with theoretical predictions obtained using SAFE method. Furthermore, comparison of the resonance frequencies of the S 1 modes, calculated using KLM approximation (f 0 = C d /2h) and SAFE method, are illustrated for each problem. The frequency spectra of the surface displacements show that resonant peaks occur at frequencies where the group velocity vanishes and the phase velocity remains finite, i.e., a minimum in the dispersion curve below the cut-off frequency. The effect of the ratio of the thicknesses of the inversion layer (IL) and the plate on the frequencies and strength of the resonant peaks is examined. It is observed that for PZT-4 with 50% IL to plate thickness ratio the frequency for the second resonant peak is about twice that for the first one. Results are presented showing the dependence of resonant frequencies on the material properties and anisotropy. Materials selection for single-element harmonic ultrasound transducers is a very important factor for optimum design of transducers with multiple thickness-mode resonant frequencies. The theoretical analysis presented in this study should provide a means for optimum ultrasound transducer design for harmonic imaging in medical applications.

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Section: Introductionmentioning

confidence: 99%

“…The same concept has been used to refine another NDT method called 'Impact Test' (Gibson and Popovics, 2005) or traditional transducer excitation for nondestructive evaluation of composite plates (Veidt et al, 2000). In these, the normal displacements of a plate structure are measured after an impact or a force is applied to the structure.…”

Section: Introductionmentioning

confidence: 99%

Dispersion of elastic guided waves in piezoelectric infinite plates with inversion layers

Cortés

Datta

Mukdadi

2008

International Journal of Solids and Structures

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“…Model for 3-3 APT to solve for the excited GW field in isotropic platesEquating Eqs (30). and(31) would give three equations in four unknowns. The fourth equation results from the divergence condition on Η, and consequently, Η , given by:(28) in (32) and evaluating at 3…”

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confidence: 99%

3-D Elasticity-Based Modeling of Anisotropic Piezocomposite Transducers for Guided Wave Structural Health Monitoring

Raghavan

Cesnik

2007

Journal of Vibration and Acoustics

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Anisotropic piezocomposite transducers (APTs), such as macro fiber composites and active fiber composites, have great potential to be used as structurally integrated transducers for guided-wave (GW) structural health monitoring. Their main advantages over conventional monolithic piezoceramic wafer transducers are mechanical flexibility, curved surface conformability, power efficiency, their ability to excite focused GW fields, and their unidirectional sensing capability as a GW sensor. In this paper, models are developed to describe excitation of GW fields by APTs in isotropic structures. The configurations explored are plane Lamb-wave fields in beams with rectangular cross-section, axisymmetric GW fields in cylinders, and 3-D GW fields in plates. The dynamics of the substrate and transducer are assumed uncoupled. The actuator is modeled as causing shear traction at the edges of the actuator’s active area along the fiber direction. The sensor is modeled as sensing the average extensional strain over the active area along the fiber direction. The work is unique in that the formulation is based on 3-D elasticity, and no reduced-order structural assumptions are used. This is crucial to model multimodal GW propagation, especially at high frequencies. A formulation is also proposed to model the behavior of APTs as GW sensors. Finally, results from experimental tests to examine the validity of the models are discussed and the possible sources of error are examined in detail.

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“…The importance of the adhesive layer between a transducer and the structure was alluded to by Veidt et al (2000) who showed that the transfer of energy from transducer to specimen is a frequency dependent characteristic of the adhesive layer. Stating that changes to the transfer characteristics between the transducer and specimen that arise from the effects of temperature, moisture or component ageing may jeopardise the reliability of the system.…”

Section: 142mentioning

confidence: 99%

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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Experimental investigation of the acousto-ultrasonic transfer characteristics of adhesively bonded piezoceramic transducers

Cited by 14 publications

References 4 publications

Dispersion of elastic guided waves in piezoelectric infinite plates with inversion layers

Dispersion of elastic guided waves in piezoelectric infinite plates with inversion layers

3-D Elasticity-Based Modeling of Anisotropic Piezocomposite Transducers for Guided Wave Structural Health Monitoring

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

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