Experimental assessment of the influence of welding process parameters on Lamb wave transmission across ultrasonically welded thermoplastic composite joints

Ochôa, Pedro; Villegas, Irene Fernández; Groves, Roger M.; Benedictus, Rinze

doi:10.1016/j.ymssp.2017.06.009

Cited by 20 publications

(19 citation statements)

References 22 publications

(45 reference statements)

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“…The function generator was used to provide a sinusoidal signal with constant predefined amplitude in a given frequency range. The power amplifier was used for signal conditioning both for the voltage (20×) and for the current (up to 200 mA) in order to operate PZT actuator in the frequency regime where impedance of the actuator is low, i.e., close to the resonant frequency of piezo elements used [ 2 , 18 ]. The digital oscilloscope was used for measuring the excitation voltage on the PZT actuator—G—as well as induced voltage on the three sensors: S1, S2, S3.…”

Section: Design and Preparation Of The Experimentsmentioning

confidence: 99%

“…Due to those properties, PZT transducers have found a variety of applications in SHM. They can be applied to: fatigue crack and corrosion detection [ 9 , 10 , 11 , 12 , 13 , 14 ]; bolt and bolted joint monitoring [ 15 , 16 ]; adhesive and welded joint monitoring [ 17 , 18 , 19 , 20 , 21 ]; detection of impact damage of composite materials [ 22 , 23 , 24 ]; civil structure monitoring [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]; transducers’ self-diagnosis [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. …”

Section: Introductionmentioning

confidence: 99%

“…Waves reflected from a damage of a finite size decay with the distance from it [ 4 ], therefore whether they can be detected by a PZT transducer depends on the distance of the damage from it. Also, pairs of PZT transducers can be used for structure monitoring—one of the transducers is exciting elastic waves, i.e., it is a PZT actuator, whereas the second one is receiving them, i.e., it is a PZT sensor [ 5 , 12 , 13 , 15 , 16 , 17 , 18 , 38 ]. If pairs of PZT transducers are used, the so called transmission mode of elastic wave interaction with a damage can be utilized in addition to the reflection mode [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Structural Health Monitoring of a Composite Panel Based on PZT Sensors and a Transfer Impedance Framework

Dziendzikowski¹,

Niedbala²,

Kurnyta³

et al. 2018

Sensors

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One of the ideas for development of Structural Health Monitoring (SHM) systems is based on excitation of elastic waves by a network of PZT piezoelectric transducers integrated with the structure. In the paper, a variant of the so-called Transfer Impedance (TI) approach to SHM is followed. Signal characteristics, called the Damage Indices (DIs), were proposed for data presentation and analysis. The idea underlying the definition of DIs was to maintain most of the information carried by the voltage induced on PZT sensors by elastic waves. In particular, the DIs proposed in the paper should be sensitive to all types of damage which can influence the amplitude or the phase of the voltage induced on the sensor. Properties of the proposed DIs were investigated experimentally using a GFRP composite panel equipped with PZT networks attached to its surface and embedded into its internal structure. Repeatability and stability of DI indications under controlled conditions were verified in tests. Also, some performance indicators for surface-attached and structure-embedded sensors were obtained. The DIs’ behavior was dependent mostly on the presence of a simulated damage in the structure. Anisotropy of mechanical properties of the specimen, geometrical properties of PZT network as well as, to some extent, the technology of sensor integration with the structure were irrelevant for damage indication. This property enables the method to be used for damage detection and classification.

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Section: Design and Preparation Of The Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structural Health Monitoring of a Composite Panel Based on PZT Sensors and a Transfer Impedance Framework

Dziendzikowski¹,

Niedbala²,

Kurnyta³

et al. 2018

Sensors

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show abstract

“…5 The Lamb wave–based method is applied in the experimental assessment on ultrasonically welded thermoplastic composite joints. 6 Since the bolt looseness reduces the stiffness of the structure, inducing changes of the structural dynamic behavior such as frequencies and mode shapes, it can be used for damage identification and health monitoring. However, the structural dynamic vibration–based technology is insensitive to the looseness of a small number of bolts, especially difficult to locate the loosened bolt position.…”

Section: Introductionmentioning

confidence: 99%

Connection looseness detection of steel grid structures using piezoceramic transducers

Yan

Liu

Song

et al. 2018

International Journal of Distributed Sensor Networks

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Connection looseness phenomena of steel grid structures might induce issues of lowering integrity, large deformation, even total collapse of the structures. The goal of this article is to propose an evaluation method for bolt-sphere joint looseness of steel grid structures using piezoceramic guided wave-based method through experiments and numerical simulations. A single bolt-sphere joint looseness experimental model is established and tested, considering grid member connection angles of 0°, 45°, 90°, and 180°, respectively. Then, multiple bolt-sphere joint looseness detection tests by selecting six kinds of cases for a steel grid structure model are performed. Piezoceramic patch arrays bonded on the surface of grid members are used as transducers to generate and receive detection guided waves, and external torques are applied to indirectly simulate the bolt-sphere joint looseness effect. The experimental results show that the bolt-sphere joint looseness impact on the ultrasonic wave energy attenuation has a nonlinear regularity. Based on the regularity, an evaluation method and key techniques for the bolt-sphere joint looseness detection based on guided wave energy are proposed and experimentally validated. To further clarify the bolt-sphere joint looseness detection mechanism, the ABAQUS software is used for a finite element analysis of the single bolt-sphere joint looseness evaluation. The numerical and experimental results match well, verifying the feasibility of the proposed method.

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“…There are different ways that may be envisioned to practically realize the coupling between parallel bars as examined in this paper. This may include, for example, coupling using magnetic attachments 32 , ultrasonic welding 33 , or mechanical couplers 34 . The choice of the specific coupling technique may depend on the nature of materials to be joined (e.g.…”

Section: Discussionmentioning

confidence: 99%

Emergent wave phenomena in coupled elastic bars: from extreme attenuation to realization of elastodynamic switches

Chen

Elbanna

2017

Sci Rep

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Metamaterials with acoustic and elastic band gaps are of great interest to scientists and engineers. Here, we introduce a novel mechanism for emergence of multiple band gaps with extreme attenuation by coupling continuous one-dimensional elastic structures. We show that it is possible to develop extreme attenuation at several frequencies from coupling two homogenous bars of different elastodynamic properties even though each bar individually possesses no such gaps. Moreover, if each bar is a composite on its own, multiple resonant band gaps appear in the compound system which do not exist in either bar. We verify our results by conducting numerical simulations for the elastodynamic response and show that the resonant gaps are efficient in attenuating wave propagation. Furthermore, we show that by carefully tailoring the properties of the coupled bars we may construct elastodynamic signal choppers. These results open a new gate for designing Metamaterial with unique wave modulation properties.

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Experimental assessment of the influence of welding process parameters on Lamb wave transmission across ultrasonically welded thermoplastic composite joints

Cited by 20 publications

References 22 publications

Structural Health Monitoring of a Composite Panel Based on PZT Sensors and a Transfer Impedance Framework

Structural Health Monitoring of a Composite Panel Based on PZT Sensors and a Transfer Impedance Framework

Connection looseness detection of steel grid structures using piezoceramic transducers

Emergent wave phenomena in coupled elastic bars: from extreme attenuation to realization of elastodynamic switches

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