Nonlinear Coda Wave Interferometry: Sensitivity to wave-induced material property changes analyzed via numerical simulations in 2D

Chen, Guangzhi; Pageot, D.; Abraham, Odile; Zhang, Yuxiang; Chekroun, Mathieu; Tournat, Vincent

doi:10.1016/j.ultras.2019.105968

Cited by 7 publications

(4 citation statements)

References 32 publications

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“…Despite the fact that the nonlinear elastic hysteretic behavior is small our results are consistent with the NRUS technique and the microcracking proliferation process as a consequence of the cyclic loading. In comparison with other studies, our results are consistent with recent numerical works based on the 2D spectral element method [ 25 , 26 , 27 , 28 , 29 ] and previous experimental results. That is, softening increases as microcrack proliferation spreads as a consequence of cyclic loading.…”

Section: Discussionsupporting

confidence: 93%

“…These studies have been focused mainly on the influence of the pump-wave emitter position, temperature variation and combining the NCWI technique with the well-know time-reversal method. Recently, simulation studies using the 2D spectral element method address the problem of the quantitative relation between the NCWI measurements and microcrack parameters such as crack length and density [ 25 , 26 , 27 , 28 , 29 ]. These studies are consistent with previous experimental results, but the numerical methodology is unable to simulate directly the nonlinear elastic hysteretic behavior produced by the pump-wave source.…”

Section: Introductionmentioning

confidence: 99%

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Feasibility of Using Shear Wave Ultrasonic Probes as Pump-Wave Sources in Concrete Microcrack Detection and Monitoring by Nonlinear Ultrasonic Coda Wave Interferometry

Donoso

Avudaiappan

Flores

2022

Sensors

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This paper represents a first attempt to study the feasibility of using shear wave (SW) ultrasonic probes as pump-wave sources in concrete microcrack detection and monitoring by Nonlinear Ultrasonic Coda Wave Interferometry (NCWI). The premise behind our study is that the nonlinear elastic hysteretic behavior at microcracks may depend on their orientation with respect to the stationary wave-field induced by the pump-wave source. In this context, the use of a SW probe as a pump-wave source may induce the nonlinear elastic behavior of microcracks oriented in directions not typically detected by a conventional longitudinal pump-wave source. To date, this premise is hard to address by current experimental and numerical methods, however, the feasibility of using SW probes as a pump-wave source can be experimentally tested. This idea is the main focus of the present work. Under laboratory conditions, we exploit the high sensitivity of the CWI technique to capture the transient weakening behaviour induced by the SW pump-wave source in concrete samples subjected to loading and unloading cycles. Our results show that after reaching a load level of 40% of the ultimate stress, the material weakening increases as a consequence of microcrack proliferation, which is consistent with previous studies. Despite the lack of exhaustive experimental studies, we believe that our work is the first step in the formulation of strategies that involve an appropriate selection and placement of pump-wave sources to improve the NCWI technique. These improvements may be relevant to convert the NCWI technique into a more suitable non-destructive testing technique for the inspection of microcracking evolution in concrete structures and the assessment of their structural integrity.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Feasibility of Using Shear Wave Ultrasonic Probes as Pump-Wave Sources in Concrete Microcrack Detection and Monitoring by Nonlinear Ultrasonic Coda Wave Interferometry

Donoso

Avudaiappan

Flores

2022

Sensors

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“…[44] Numerical simulations in configurations related to this method have also been carried out with the spectral element method [45] in a 2D configuration, where the elastic parameters of a zone of the reverberating (or multiple-scattering) domain were slightly changed in order to extract the subsequent effects on the NCWI observables [46]. More recently, we numerically explored some of the limits of NCWI regarding the elasticity change assumed to be generated by a pump wave, the distributed damage, and the scattering role of a collection of cracks [47].…”

Section: Introductionmentioning

confidence: 99%

Numerical parametric study of Nonlinear Coda Wave Interferometry sensitivity to microcrack size in a multiple scattering medium

et al. 2021

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“…Using the two-dimensional finite-difference time-domain model within the framework of the locadiff imaging technique, the extended changes in multiple scattering media characterized by coda wave decorrelation can be calculated [29]. A 2D spectral element method was applied to simulate complex coda signals to study the sensitivity of nonlinear coda interference parameters of samples with local damage, and the research scale was gradually refined: the effective elastic characteristics of the sample, the local crack area, and the effective length of the microcrack [30][31][32]. In order to explore the susceptibility of the coda wave to various damages in the concrete failure process at the micro-scale, a research system of concrete mesostructure generator discrete element calculation of concrete fracture finite-difference simulation of the ultrasonic field was constructed [33].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Coda Wave Experiment and Simulation of Concrete Damage Process under Uniaxial Compression

Song

Xue

et al. 2022

Buildings

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Using the coda wave interferometry (CWI) method to obtain the ultrasonic coda wave characteristics of loaded concrete is an important method to evaluate the mechanical response of concrete. In this paper, the ultrasonic coda wave characteristics of C40–C70 concrete specimens (four strengths of concrete) under uniaxial compression were tested by laboratory experiments. Furthermore, to clarify the relationship between the internal damage process of concrete and the change rate of coda wave velocity, an ultrasonic coda wave discrete element simulation model combined with digital image processing technology was established. The results show that the coda wave is very sensitive to small changes in the compressive damage to concrete, and the change in coda wave velocity can correspond to the development process of concrete damage. This research is conducive to a better understanding of the complex material behavior of compressive concrete and proves the feasibility of ultrasonic field simulation and processing by using numerical simulation images of concrete damage.

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Nonlinear Coda Wave Interferometry: Sensitivity to wave-induced material property changes analyzed via numerical simulations in 2D

Cited by 7 publications

References 32 publications

Feasibility of Using Shear Wave Ultrasonic Probes as Pump-Wave Sources in Concrete Microcrack Detection and Monitoring by Nonlinear Ultrasonic Coda Wave Interferometry

Feasibility of Using Shear Wave Ultrasonic Probes as Pump-Wave Sources in Concrete Microcrack Detection and Monitoring by Nonlinear Ultrasonic Coda Wave Interferometry

Numerical parametric study of Nonlinear Coda Wave Interferometry sensitivity to microcrack size in a multiple scattering medium

Ultrasonic Coda Wave Experiment and Simulation of Concrete Damage Process under Uniaxial Compression

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