In-situ observation of strain and cracking in coated laminates by digital image correlation

Smith, Gregory M.; Higgins, Olivia; Sampath, Sanjay

doi:10.1016/j.surfcoat.2017.08.057

Cited by 27 publications

(13 citation statements)

References 28 publications

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“…Presently, NDT used in civil engineering structures, are easier to handle due to the continuous development of measuring technology and, taking into account the “correct” evaluation of the results, provide a reasonable basis for a reliable assessment of the actual condition of the structure. There are various NDT techniques have been used for decades, currently more than 70 types of standardized testing methods can be applicable to the evaluation of concrete structures, e.g., acoustic emission [3,4,5,6], infrared thermography [7,8,9], ground-penetrating radar [10,11,12,13], Fiber Bragg grating (FBG) [14,15], or digital image correlation (DIC) [16,17,18].…”

Section: Introductionmentioning

confidence: 99%

Early Crack Detection of Reinforced Concrete Structure Using Embedded Sensors

Chakraborty

Katunin

Klikowicz

et al. 2019

Sensors

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The damage in reinforced concrete (RC) structures can be induced either by the dynamic or static load. The inspection technologies available today have difficulty in detecting slowly progressive, locally limited damage, especially in hard-to-reach areas in the superstructure. The four-point bending test on the benchmark RC structure was used as a test of the quality and sensitivity of the embedded sensors. It allowed assessment of whether any cracking and propagation that occurs with the embedded sensors can be detected. Various methods are used for the analysis of the ultrasonic signals. By determining the feature from the ultrasonic signals, the changes in the whole structure are evaluated. The structural degradation of the RC benchmark structure was tested using various non-destructive testing methods to obtain a comprehensive decision about structural condition. It is shown that the ultrasonic sensors can detect a crack with a probability of detection of 100%, also before it is visible by the naked eye and other techniques, even if the damage is not in the direct path of the ultrasonic wave. The obtained results confirmed that early crack detection is possible using the developed methodology based on embedded and external sensors and advanced signal processing.

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Section: Introductionmentioning

confidence: 99%

Early Crack Detection of Reinforced Concrete Structure Using Embedded Sensors

Chakraborty

Katunin

Klikowicz

et al. 2019

Sensors

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“…[2][3][4] It is important to conduct effective monitoring of cracks because the early detection helps reduce the risk of such structural failure. 3 In the past, a variety of monitoring techniques have been proposed and adopted to detect crack development in a structure; they include acoustic emission, 5 infrared thermography, 6 ground penetrating radar, 7 fiber Bragg grating, 8 digital image correlation, 9 and computer vision. 10 As the timing and position of crack opening are usually unforeseen, a solution that has wide coverage and allows continuous monitoring will be attractive.…”

Section: Introductionmentioning

confidence: 99%

Brillouin scattering spectrum-based crack measurement using distributed fiber optic sensing

Luo

Soga

2021

Structural Health Monitoring

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Brillouin scattering-based distributed fiber optic sensing (Brillouin-DFOS) technology is widely used in health monitoring of large-scale structures with the aim to provide early warning of structural degradation and timely maintenance and renewal. Material cracking is one of the key mechanisms that contribute to structural failure. However, the conventional strain measurement using the Brillouin-DFOS system has a decimeter-order spatial resolution, and therefore it is difficult to measure the highly localized strain generated by a sub-millimeter crack. In this study, a new crack analysis method based on Brillouin scattering spectrum (BSS) data is proposed to overcome this spatial resolution-induced measurement limitation. By taking the derivative of the BSS data and tracking their local minimums, the method can extract the maximum strain within the spatial resolution around the measurement points. By comparing the variation of the maximum strain within the spatial resolution around different measurement points along the fiber, cracks can be located. The performance of the method is demonstrated and verified by locating and quantifying a small gap created between two wood boards when one of the wood boards is pushed away from the other. The test result verifies the accuracy of the crack strain quantification of the method and proves its capability to measure a sub-millimeter crack. The method is also applied to a thin bonded concrete overlay of asphalt pavement field experiment, in which the growth of a transverse joint penetrating through the concrete–asphalt interface was monitored. The method successfully locates the position, traces the strain variation, and estimates the width of a crack less than [Formula: see text] wide using a Brillouin-DFOS system with [Formula: see text] spatial resolution.

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“…The coating capabilities are expanded as a result of the development of new coating techniques. Prominent among these techniques is thermal spraying which integrates the most flexible diversity in materials and applications [8,9]. In these new emerging applications, the coating-substrate integration which primarily relies on the interfacial bond between coating and substrate is very crucial.…”

Section: Introductionmentioning

confidence: 99%

Analytical and Numerical Modelling of Interfacial Stress Distribution of a Piezoresistive Coating Layer

Ogunbadejo

McDonald

Chandra

2021

Thermal Spray 2021: Proceedings From the International Thermal Spray Conference

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Thermally sprayed coatings can be used in structural health monitoring devices where the coatings can reveal defects in the real-time integrity of the component through changes in mechanical, thermal or modal properties during service. In this emerging application, the mechanical properties of the coating are strongly affected by the interfacial bond between the coating and the substrate. This paper presents an analytical study of the interfacial stress distribution based on piezoresistive-stress constitutive relation of a coating layer. Both a single layer coating- and a bilayer coating-substrate system were considered. An analytical solution of the interfacial stress was developed by solving a Fredholm-Volterra singular integro-differential equation of a coating-substrate model using Chebyshev polynomials. Numerical simulation was conducted to analyze the effects of geometric and effective material properties of the coating-substrate system on the interfacial stress distribution. It was found that the susceptibility of the piezoresistive layer to delamination primarily relies on thicknesses of the coating layers and the stiffness of the intermediary insulating layer and substrate.

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In-situ observation of strain and cracking in coated laminates by digital image correlation

Cited by 27 publications

References 28 publications

Early Crack Detection of Reinforced Concrete Structure Using Embedded Sensors

Early Crack Detection of Reinforced Concrete Structure Using Embedded Sensors

Brillouin scattering spectrum-based crack measurement using distributed fiber optic sensing

Analytical and Numerical Modelling of Interfacial Stress Distribution of a Piezoresistive Coating Layer

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