A new design and manufacturing process for embedded Lamb waves interdigital transducers based on piezopolymer film

Bellan, F.; Bulletti, Andrea; Capineri, Lorenzo; Masotti, L.; Yaralioglu, G.G.; Degertekin, F. Levent; Khuri‐Yakub, Butrus T.; Guasti, F.; Rosi, E.

doi:10.1016/j.sna.2005.05.013

Cited by 44 publications

(30 citation statements)

References 11 publications

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“…is to embed the sensors into a composite structure . Bellan et al designed and embedded polyvinylidene fluoride transducers in a 3 mm thick carbon fiber reinforced plastic (CFRP) composite laminate to operate with Lamb waves, and their works open a perspective of piezopolymer to be used in NDT monitoring systems . Since the surface‐bonded PZT ceramics can be easily damaged during integrating process or by the structure deformation, Manka et al presented the investigation results of three types of transducers based on the non‐fragility macro‐fiber composite .…”

Section: Introductionmentioning

confidence: 99%

Damage Localization in Composite Laminates by Building in PZT Wafer Transducers: A Comparative Study with Surface‐Bonded PZT Strategy

et al. 2018

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Lamb waves provide sensitive and effective approach for nondestructive inspection of large-scale composite structures. Traditionally in Lamb wavebased damage detection systems, the piezoelectric (PZT) wafer transducers are attached on the surface of composite components. However, surfacebonded PZT wafers are fragile, and they may lose serviceability when external load happens. In this paper, numerical and theoretical investigations are firstly carried out to analyze the Lamb wave features generated by PZT wafers that are located in the mid-thickness of a thin-walled plate. Subsequently, the authors integrate the PZT wafer arrays in woven glass fiber reinforced epoxy (WGF/epoxy) laminates with stacking sequence of [90 /0 ] 4 . It is found that the approximate single S0 Lamb wave mode is generated by the built-in PZT wafers. This makes the received signals very simple and easy to be interpreted. Utilizing the signals obtained by the built-in and surface-bonded PZT wafer transmitter-receiver arrays, damage localization algorithms that considered the slowness profiles are compiled to help locating the defects. The compared results demonstrate that the built-in PZT strategy has great potential for quantitative non-destructive evaluation of composite structures.

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Section: Introductionmentioning

confidence: 99%

Damage Localization in Composite Laminates by Building in PZT Wafer Transducers: A Comparative Study with Surface‐Bonded PZT Strategy

et al. 2018

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“…An especially troublesome challenge is the lack of sophisticated sensors and sensor design guidelines for RUS cure monitoring. There are a number of recent articles that deal with ultrasound sensor design, such as [6,7], but they do not take the response function of the tool into account. While the principle itself allows for the use of crude sensors, for example two piezo ceramics applied to the tool surface as shown in Figure 1, to measure the curing of epoxies, as shown in [2], they are prone to acoustic reflections and do not fully incorporate a possible concentric eigenmode induced by the RUS.…”

Section: Introductionmentioning

confidence: 99%

Sensor Design Optimization for Ultrasonic Spectroscopy Cure Monitoring

Pommer

Sinapius

2018

Sensors

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In the field of cure monitoring, resonant ultrasonic cure monitoring is a unique technique to measure the progression of cure of composites in fully or partially closed tools. It allows for the use of electronic hardware that is less sophisticated than traditional pulse-based ultrasonic systems to obtain accurate results. While this technique is not new, it has been used very rarely. One reason for this is the lack of optimized sensors. Commercially available sensors are optimized for pulse-based ultrasonic testing. This paper establishes a possible optimized sensor design for resonant ultrasound cure monitoring using a multi-parameter FE model.

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“…In [8,9,10,11], the authors presented a guided-wave ultrasound structural health system based on linear arrays of interdigital piezopolymer transducers bonded to a composite pressure vessel. In that system, interdigital transducers were adopted to perform both damage assessment and impact detection/localization using a simple fixed-threshold technique [8,12].…”

Section: Introductionmentioning

confidence: 99%

A Novel Differential Time-of-Arrival Estimation Technique for Impact Localization on Carbon Fiber Laminate Sheets

Merlo

Bulletti

Giannelli

et al. 2017

Sensors

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Composite material structures are commonly used in many industrial sectors (aerospace, automotive, transportation), and can operate in harsh environments where impacts with other parts or debris may cause critical safety and functionality issues. This work presents a method for improving the accuracy of impact position determination using acoustic source triangulation schemes based on the data collected by piezoelectric sensors attached to the structure. A novel approach is used to estimate the Differential Time-of-Arrival (DToA) between the impact response signals collected by a triplet of sensors, overcoming the limitations of classical methods that rely on amplitude thresholds calibrated for a specific sensor type. An experimental evaluation of the proposed technique was performed with specially made circular piezopolymer (PVDF) sensors designed for Structural Health Monitoring (SHM) applications, and compared with commercial piezoelectric SHM sensors of similar dimensions. Test impacts at low energies from 35 mJ to 600 mJ were generated in a laboratory by free-falling metal spheres on a 500 mm × 500 mm × 1.25 mm quasi-isotropic Carbon Fiber Reinforced Polymer (CFRP) laminate plate. From the analysis of many impact signals, the resulting localization error was improved for all types of sensors and, in particular, for the circular PVDF sensor an average error of 20.3 mm and a standard deviation of 8.9 mm was obtained.

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A new design and manufacturing process for embedded Lamb waves interdigital transducers based on piezopolymer film

Cited by 44 publications

References 11 publications

Damage Localization in Composite Laminates by Building in PZT Wafer Transducers: A Comparative Study with Surface‐Bonded PZT Strategy

Damage Localization in Composite Laminates by Building in PZT Wafer Transducers: A Comparative Study with Surface‐Bonded PZT Strategy

Sensor Design Optimization for Ultrasonic Spectroscopy Cure Monitoring

A Novel Differential Time-of-Arrival Estimation Technique for Impact Localization on Carbon Fiber Laminate Sheets

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