Structural health monitoring of cylindrical structures using guided ultrasonic waves

Gaul, Lothar; Sprenger, Helge; Schaal, Christoph; Bischoff, Stefan

doi:10.1007/s00707-012-0634-z

Cited by 29 publications

(7 citation statements)

References 23 publications

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“…[9][10][11] Ultrasonic guided waves (GWs) are a promising alternative to current SHM techniques, because a large area can be scanned with fewer sensors, and damages that are located in inaccessible areas can be detected; 12,13 GW propagation in steel bars has been extensively studied to detect such damages. 14 The signal strength and time-of-flight measurements of GWs have indicated the potential in assessing the changes in rebar diameter. 15 Studies have also indicated that the pitting type of corrosion can be quantified using GWs.…”

Section: Introductionmentioning

confidence: 99%

Identification of incipient pitting corrosion in reinforced concrete structures using guided waves and piezoelectric wafer transducers

Sriramadasu

Banerjee

2018

Structural Health Monitoring

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Corrosion poses a great threat to ageing civil infrastructure in the world, and researchers are seeking methods to monitor the corrosion in reinforced concrete structures. Detection of corrosion at its incipient stage has been an impending task in the non-destructive testing of materials. Several non-destructive testing methods to assess the presence of corrosion exist. The limitation of the current methods is that either they require measurement at several points or they require a large network of sensors. Guided wave-based monitoring overcomes these limitations because a large area can be scanned using fewer sensors. The process of corrosion is complex, and it leads to a simultaneous reduction in the diameter and the debonding between concrete and reinforcing steel bars in reinforced concrete structures. However, some of the recent studies that explore the use of guided waves focus only on the detection of the individual effect of diameter reduction and debonding of the rebars in reinforced concrete by artificially inducing the damage. In this study, an accelerated corrosion setup is deployed to induce pitting corrosion in reinforced concrete beams using the impressed current method. These beams are continuously monitored using ultrasonic guided waves that are generated and received by piezoelectric wafer transducers that are attached to the rebars. It is shown that the incipient stage of pitting corrosion can be detected successfully, and the mechanism of corrosion process, which involves the corrosion initiation, progression, and diameter reduction-and-cracking phases, can be established from the signal characteristics of the longitudinal and flexural-guided wave modes. The impressed current flow in the corrosion cell also confirms the various phases of corrosion.

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Section: Introductionmentioning

confidence: 99%

Identification of incipient pitting corrosion in reinforced concrete structures using guided waves and piezoelectric wafer transducers

Sriramadasu

Banerjee

2018

Structural Health Monitoring

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“…A variety of methods have been developed for the efficient detection of cracks on cylinders, such as optical fibers [5], electrical resistance [6], vibration detection [7], magnetic induction [8], infrared thermography [9], and ultrasound testing [10][11][12][13]. Among them, the ultrasound testing technique has been widely used due to its relatively high spatial resolution, portable operation, high performance ratio, and high effectiveness in damage detection.…”

Section: Of 18mentioning

confidence: 99%

Surface Crack Identification on a Cylinder Using the Signal Enhancement of the Scanning Laser Line Source Method

et al. 2018

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Cylindrical structures play an important role in industrial fields. The surface crack is a typical defect in the cylindrical structures. Non-destructive surface crack detection of these structures is critical to the safe operation of the equipment. In this study, the signal enhancement of the scanning laser line source (SLLS) method is investigated by a numerical simulation method to identify the location and depth of the surface crack in the aluminum cylinder. A fully coupled explicit finite element model is established to study the signal enhancement of cylindrical surface waves on the aluminum cylinder. The simulation results indicate that the signal enhancement of the SLLS is more sensitive to the surface crack of a cylinder than that of the scanning laser detection (SLD) because of the wider span and higher peak. Due to the phase shift characteristics of surface waves on the cylinder, the maximum peak-to-peak amplitude of signal enhancement in the SLLS method (the SLLS peak) is affected by the detection position and diameter of the cylinder. Therefore, an optimization approach for detection position in SLLS is proposed for the location of surface crack on the cylinder. The locations of the surface crack on the solid cylinders with different diameters are investigated using simulated laser ultrasonic field data. Moreover, we find that the SLLS peak for signal enhancement can effectively respond to the crack depth within a limited scope which is dependent on the directivity pattern of the longitudinal waves.

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“…This mode conversion is quantified in terms of reflection and transmission, or, scattering coefficients. Gaul et al [51] analyzed reflection and transmission of guided waves at arbitrarily shaped discontinuities in the cylinders using finite element and boundary element methods. The numerical results were confirmed with a series of laser-based ultrasound measurements.…”

Section: Monitoring Pitting Corrosionmentioning

confidence: 99%

Review of Physical Based Monitoring Techniques for Condition Assessment of Corrosion in Reinforced Concrete

Lei

Zheng

2013

Mathematical Problems in Engineering

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Monitoring the condition of steel corrosion in reinforced concrete (RC) is imperative for structural durability. In the past decades, many electrochemistry based techniques have been developed for monitoring steel corrosion. However, these electrochemistry techniques can only assess steel corrosion through monitoring the surrounding concrete medium. As alternative tools, some physical based techniques have been proposed for accurate condition assessment of steel corrosion through direct measurements on embedded steels. In this paper, some physical based monitoring techniques developed in the last decade for condition assessment of steel corrosion in RC are reviewed. In particular, techniques based on ultrasonic guided wave (UGW) and Fiber Bragg grating (FBG) are emphasized. UGW based technique is first reviewed, including important characters of UGW, corrosion monitoring mechanism and feature extraction, monitoring corrosion induced deboning, pitting, interface roughness, and influence factors. Subsequently, FBG for monitoring corrosion in RC is reviewed. The studies and application of the FBG based corrosion sensor developed by the authors are presented. Other physical techniques for monitoring corrosion in RC are also introduced. Finally, the challenges and future trends in the development of physical based monitoring techniques for condition assessment of steel corrosion in RC are put forward.

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Structural health monitoring of cylindrical structures using guided ultrasonic waves

Cited by 29 publications

References 23 publications

Identification of incipient pitting corrosion in reinforced concrete structures using guided waves and piezoelectric wafer transducers

Identification of incipient pitting corrosion in reinforced concrete structures using guided waves and piezoelectric wafer transducers

Surface Crack Identification on a Cylinder Using the Signal Enhancement of the Scanning Laser Line Source Method

Review of Physical Based Monitoring Techniques for Condition Assessment of Corrosion in Reinforced Concrete

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