Ultrasonic inspection for the detection of debonding in CFRP-reinforced concrete

Ribolla, Emma La Malfa; Rezaee-Hajidehi, Mohsen; Rizzo, Piervincenzo; Scimemi, Giuseppe Fileccia; Spada, Antonino; Giambanco, Giuseppe

doi:10.1080/15732479.2017.1384843

Cited by 39 publications

(20 citation statements)

References 27 publications

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“…In the process of health monitoring, transducers are bonded or embedded to the surface of the specimen to excite the host structure with a range of frequency and monitor the changes of mechanical impedances [7][8][9]. Ultrasonic NDE has a limitation in the detection of near-surface defects such as delamination of plies which was discussed by [10,11]. This limitation occurs because the normal pulse-echo ultrasonic technique has difficulty in resolving the echo of near-surface defects.…”

Section: Introductionmentioning

confidence: 99%

Design and Evaluation of a Novel Low Acoustic Impedance-Based PZT Transducer for Detecting the Near-Surface Defects

Mohammadabadi

Dugnani

2019

Preprint

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Near-surface defects are one of the most common types of damage occurring in polymer composite materials. Conventional Non-Destructive Testing (NDT) techniques, especially ultrasonic testing, are not always suitable for detecting these types of defect, especially in thin plates. The proposed NDT method in this article employs Low Acoustic Impedance (LAI) characterization. The novelty of LAI technique lies in the transverse resonating of Lead-Zirconate-Titanate (PZT) transducer which shows significant lower effective acoustic impedance compared to thickness - extension mode. The LAI technique eliminates the need for the matching layers and reduces the manufacturing cost consequently. Briefly, the analytical model has been introduced and the fabrication procedure has been discussed in detail. The setup has been evaluated both numerically and experimentally to detect a debonding. The results proved the ability of LAI technique in the detection of defects and, moreover, the approximate geometry of the affected region as well.

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Section: Introductionmentioning

confidence: 99%

Design and Evaluation of a Novel Low Acoustic Impedance-Based PZT Transducer for Detecting the Near-Surface Defects

Mohammadabadi

Dugnani

2019

Preprint

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“…The system in [21] uses Bluetooth technology and a TCP/IP network protocol. Among the methods proposed in the literature for SHM, which can be used in an IoT-based system, in [22] an ultrasonic inspection system for the SHM is proposed. Additionally, in [23], the Huang-Hilbert Transform is used to analyse the sensor data to infer the health of a structure.…”

Section: State Of the Art In The Iot System For Shmmentioning

confidence: 99%

A layered IoT-based architecture for a distributed structural health monitoring system System

et al. 2019

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Structural health monitoring (SHM) is responsible for identifying techniques and for prototyping systems performing a state diagnosis of structures. Its aim is to prevent sudden civil infrastructure failure as a result of several invisible sources of damage. Since structural damage is often caused by ground phenomena involving circumscribed geographical areas, it is useful to extend SHM systems to allow for the exchange of information among nearby buildings and then to increase the timeliness of the alerts. To this end, in this article, an SHM based on the IoT paradigm is proposed (SHM-IoT). SHM-IoT carries out both localised monitoring on a single building, and it uses information collected by several sensors correlated in time, aiming to identify potentially dangerous damage. It also performs a wider monitoring on a group of buildings in order to alert a larger number of people. SHM-IoT also sends a remote notification, which is finalised in order to alert the authorities and rescuers about the status of each monitored building. In this context, synchronisation problems arise because the information collected by each sensor of the SHM-IoT needs to be correlated in time in order to be used for damage evaluation and alert generation. In this paper, the hardware and software architectures of the proposed SHM-IoT are presented together with the synchronisation requirements and the methods of satisfying them. Experiments are undertaken to validate the SHM-IoT in real scenarios.

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“…Fibers bridge the cracks, resulting in a significant increase of the fatigue life. Much research has been carried out in this field [15][16][17][18][19][20][21], and in all cases, the results have shown a relevant improvement of the fatigue response of the concrete elements.…”

Section: Introductionmentioning

confidence: 99%

Plain and Fiber-Reinforced Concrete Subjected to Cyclic Compressive Loading: Study of the Mechanical Response and Correlations with Microstructure Using CT Scanning

Mínguez

Gutierrez²,

González

et al. 2019

Applied Sciences

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The response ranges of three principal mechanical parameters were measured following cyclic compressive loading of three types of concrete specimen to a pre-defined number of cycles. Thus, compressive strength, compressive modulus of elasticity, and maximum compressive strain were studied in (i) plain, (ii) steel-fiber-reinforced, and (iii) polypropylene-fiber-reinforced high-performance concrete specimens. A specific procedure is presented for evaluating the residual values of the three mechanical parameters. The results revealed no significant variation in the mechanical properties of the concrete mixtures within the test range, and slight improvements in the mechanical responses were, in some cases, detected. In contrast, the scatter of the mechanical parameters significantly increased with the number of cycles. In addition, all the specimens were scanned by means of high resolution computed tomography, in order to visualize the microstructure and the internal damage (i.e., internal micro cracks). Consistent with the test results, the images revealed no observable internal damage caused by the cyclic loading.

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Ultrasonic inspection for the detection of debonding in CFRP-reinforced concrete

Cited by 39 publications

References 27 publications

Design and Evaluation of a Novel Low Acoustic Impedance-Based PZT Transducer for Detecting the Near-Surface Defects

Design and Evaluation of a Novel Low Acoustic Impedance-Based PZT Transducer for Detecting the Near-Surface Defects

A layered IoT-based architecture for a distributed structural health monitoring system System

Plain and Fiber-Reinforced Concrete Subjected to Cyclic Compressive Loading: Study of the Mechanical Response and Correlations with Microstructure Using CT Scanning

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