Influence of damage in the acoustic emission parameters

Carpinteri, Alberto; Lacidogna, Giuseppe; Accornero, Federico; Mpalaskas, A. C.; Matikas, Theodore E.; Aggelis, Dimitrios G.

doi:10.1016/j.cemconcomp.2013.08.001

Cited by 134 publications

(74 citation statements)

References 35 publications

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“…2010); (d) the assessment of damage and structural health (Ohtsu and Watanabe ; Carpinteri et al . ; Behnia, Chai and Shiotani ); (e) the study of hydraulic fracturing processes (Ishida ; Chen, Nagaya and Ishida ); f) the investigation of earthquake generation mechanisms (Lai and Ma ); and (g) the assessment of stress history in geomaterials (Lavrov ; Hsieh, Dight and Dyskin ).…”

Section: Introductionmentioning

confidence: 99%

“…and Ballvy 2016); (b) the identification of cracking modes (Fortin et al 2009;Aggelis 2011); (c) the development of algorithms for event location (Graham et al 2010); (d) the assessment of damage and structural health (Ohtsu and Watanabe 2001;Carpinteri et al 2013;Behnia, Chai and Shiotani 2014); (e) the study of hydraulic fracturing processes (Ishida 2001;Chen, Nagaya and Ishida 2015); f) the investigation of earthquake generation mechanisms (Lai and Ma 2014); and (g) the assessment of stress history in geomaterials (Lavrov 2003.;Hsieh, Dight and Dyskin 2014).…”

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confidence: 99%

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Acoustic emission processes occurring during high‐pressure sand compaction

Muñoz‐Ibáñez

Delgado‐Martín

Grande‐García

2018

Geophysical Prospecting

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Granular materials submitted to uniaxial compression undergo pore space reduction due to mechanisms such as particle rearrangement and grain crushing. These changes in the internal structure of the material release energy in the form of elastic waves that can be detected by sensors sensitive to acoustic emission. In this study, Acoustic emission monitoring with a wavelet‐based signal processing technique is used to identify the various mechanisms occurring during high‐pressure sand compaction. Particle movement, grain failure, friction between grains and the surface of the compression cell and intergranular friction are studied. Acoustic emission data recorded during these simplified tests are used to characterize each phenomenon. Wavelet transform analyses allow the identification of useful features, making possible frequency discrimination among sliding, rolling, friction and grain fragmentation processes. For instance, we observe that at low stress, grain flow is characterized by the lowest centroid and peak frequencies, while at greater stresses, intergranular friction and grain fragmentation have the higher values. In the tests performed, the stress–strain evolution and final condition of the tested sand are broadly consistent, irrespective of the condition employed: continuous, stepwise or even variable loading rate or temperature. However, Acoustic emission data manifest much more complex behaviour (including thermal, load‐rate dependency and delayed fragmentation phenomena) than that suggested by stress–strain relationships. At low stress levels, grain flow (sliding/rolling) is a relevant strain‐accommodation mechanism, but so is crushing due to the effect of concentrated forces at the grain contact level. At high stresses, when crushing is generalized, intergranular friction is also a relevant phenomenon due to the increase in the coordination number produced by previous fragmentation.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Acoustic emission processes occurring during high‐pressure sand compaction

Muñoz‐Ibáñez

Delgado‐Martín

Grande‐García

2018

Geophysical Prospecting

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“…Validation using the cracking characterization in a laboratory should be correlated with real structures of different sizes and different ingredients. Specimen size, as well as sensor type and sensors separation distance have a strong influence on AE test results [22].…”

Section: Factors Affecting Acoustic Emission Testsmentioning

confidence: 99%

Monitoring Damage Using Acoustic Emission Source Location and Computational Geometry in Reinforced Concrete Beams

2018

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Non-destructive testing in reinforced concrete (RC) for damage detection is still limited to date. In monitoring the damage in RC, 18 beam specimens with varying water cement ratios and reinforcements were casted and tested using a four-point bending test. Repeated step loads were designed and at each step load acoustic emission (AE) signals were recorded and processed to obtain the acoustic emission source location (AESL). Computational geometry using a convex hull algorithm was used to determine the maximum volume formed by the AESL inside the concrete beam in relation to the load applied. The convex hull volume (CHV) showed good relation to the damage encountered until 60% of the ultimate load at the midspan was reached, where compression in the concrete occurred. The changes in CHV from 20 to 40% and 20 to 60% load were five and 13 times from CHV of 20% load for all beams, respectively. This indicated that the analysis in three dimensions using CHV was sensitive to damage. In addition, a high water-cement ratio exhibited higher CHV formation compared to a lower water-cement ratio due to its ductility where the movement of AESL becomes wider.

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“…Therefore, the present work details application of generalized logistic equation for b-value analysis of acoustic emission in single edge notched (SEN) plain concrete beams.Acoustic emission phenomena has a close resemblance to earthquakes [13] despite voluminous contrast on the temporal, spectral, spatial and energetic scales [14]. The acoustic emission (AE) is a non-destructive technique and different features of it have been used for structural health monitoring (SHM) [15][16][17][18][19][20]. It is an acoustic based passive technique relying on stress waves generated by cracking of material.…”

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Application of generalized logistic equation for b-value analysis in fracture of plain concrete beams under flexure

Burud

Kishen

2019

Engineering Fracture Mechanics

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A B S T R A C TThis work investigates the effect of finite size and evolution of fracture process zone on b-value of acoustic emission in concrete beams. It is shown that the AE b-value determined using the Gutenberg-Richter (GR) law varies with beam size and invalidates universality. Since GR law fits the frequency-magnitude curve partially, a recently proposed Maslov's generalized logistic equation (GLE) is used for b-value analysis. The existence of cut-off magnitude and nonlinearity of frequency-magnitude distribution is explained through crack interaction mechanisms occurring within the FPZ. The growth of micro and macro cracking in concrete is observed to follow logistic or sigmoid growth law rather than the power law. The b-values obtained from GR and GLE are compared and it is found that the b-value of GLE correlates well with the effective crack length during damage process of plain concrete thereby exhibiting damage compliant behavior which could be used in health monitoring of structures. As GR law was first introduced for statistical analysis of earthquakes and applied without any modification to acoustic emission https://doi.T due to its reasonable interpretation of this phenomenon [2], it is necessary to review its development in seismological studies. Therefore, the present work mostly reviews seismological and geophysical literature. Mainly, three different types of approaches are followed in literature to improve b-value estimation: (1) employing statistics based formulation by accounting nonlinearity while preserving pure GR law, (2) modifying GR law at large magnitudes by associating it with a polynomial or exponential or logarithmic cut-off and (3) suggesting an alternative model or generalizing GR law to consider the shape of distribution. By idealizing the occurrence of earthquakes as a Poisson process, the first approach with validity of GR law has yielded various statistical b-value estimates such as maximum likelihood estimate or Aki's formula [3], improved b-value [4], Weichert's formula [5], generalized Aki-Utsu β-estimator [6] and few others. An alternate approach based on robust fitting [7] has been proposed which is shown to be more efficient than maximum likelihood estimate. Cut-off on maximum magnitude approach has resulted in many of upper bound models such as tapered GR, truncated Gamma law, truncated GR, etc. The third approach has not received significant contribution except for a few which are noted further. The recent development in Tsallis nonextensive statistical mechanics has offered a generalized form of GR law [8-10] based on Tsallis entropy. A Bayesian approach [11] is also notable in the category of generalized GR law. Apart from the above mentioned contributions, an approach based on logistic equation proposed by Maslov et al. [12] is distinct due to its fractional power-law exponent. This two parameter model regards nonlinear CFD over whole magnitude range with soft cut-off for larger magnitudes. The overall shape of CFD suggest that the growth of microcracks is log...

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Influence of damage in the acoustic emission parameters

Cited by 134 publications

References 35 publications

Acoustic emission processes occurring during high‐pressure sand compaction

Acoustic emission processes occurring during high‐pressure sand compaction

Monitoring Damage Using Acoustic Emission Source Location and Computational Geometry in Reinforced Concrete Beams

Application of generalized logistic equation for b-value analysis in fracture of plain concrete beams under flexure

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