Long-Range Correlations and Natural Time Series Analyses from Acoustic Emission Signals

Friedrich, Leandro Ferreira; Cezar, Édiblu Silva; Colpo, Angélica Bordin; Tanzi, Boris Nahuel Rojo; Sobczyk, Mario; Lacidogna, Giuseppe; Niccolini, Gianni; Kosteski, Luís Eduardo; Iturrioz, Ignácio

doi:10.3390/app12041980

Cited by 10 publications

(4 citation statements)

References 54 publications

(79 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Various characteristics and statistical parameters of the acoustic activity (for example, the frequency of generation of acoustic events, the energy release rate, the b-value, etc. ), have been proven to be quite valuable and flexible tools, for the investigation of the evolution of microcracking processes within the loaded material (especially at the stage at which macroscopic fracture is approaching [1][2][3][4][5][6][7]), providing, in addition, reliable pre-failure indicators [8][9][10][11][12][13]. Moreover, it has been proven that the combined consideration of the Rise Angle (RA) and the Average Frequency (AF) of an acoustic signal permits the classification of the damage mechanisms activated to tensile or shear nature [14,15].…”

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Distribution of the Sources of Acoustic Events in Notched Fiber-Reinforced Concrete Beams under Three-Point Bending

et al. 2023

View full text Add to dashboard Cite

The acoustic activity, generated in notched, beam-shaped concrete specimens, loaded under three-point bending, is studied in terms of the position of the sources of acoustic events, and the frequency of their generation. Both plain specimens (without any internal reinforcement) and specimens reinforced with various types of short fibers were tested. The target of the study is to investigate the existence of indices that could be considered as pre-failure indicators of the upcoming fracture. In addition, an attempt is undertaken to classify the damage mechanisms activated to tensile or shear nature. Considering comparatively the spatio-temporal evolution of the position of the acoustic sources and the respective temporal evolution of the frequency of generation of acoustic events, it was concluded that for relatively low load levels the acoustic sources are rather randomly distributed all over the volume of the specimens. As the load increases toward its maximum value, the acoustic sources tend to accumulate in the immediate vicinity of the crown of the notch and the average distance between them approaches a minimum value. When this minimum value is attained, the load is maximized and the generation frequency of the acoustic events increases rapidly. The simultaneous fulfillment of these three conditions is observed a few seconds before the onset of propagation of the catastrophic macrocrack for all classes of specimens tested, providing a kind of warning signal about the upcoming fracture. Moreover, the classification of the damage mechanisms to tensile and shear ones revealed a crucial difference between the plain and the reinforced specimens after the maximization of the load applied. Indeed, while for the plain specimens, the prevailing damage mechanism is tensile microcracking, for the reinforced specimens a balance between tensile and shear damage mechanisms is observed after the load applied has attained its peak and starts decreasing.

show abstract

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Distribution of the Sources of Acoustic Events in Notched Fiber-Reinforced Concrete Beams under Three-Point Bending

et al. 2023

View full text Add to dashboard Cite

show abstract

“…which, for ω → 0 , simplifies to Π(ω) ideal ≈ 1 − 0.07ω 2 . More detailed discussions of Equations (2)-(4) were presented in [25,32]. According to Varotsos et al [33][34][35][36], a dynamical system is considered in a labeled true critical state if three criteria are accomplished simultaneously:…”

Section: Introductionmentioning

confidence: 99%

Analysis of Acoustic Emission Activity during Progressive Failure in Heterogeneous Materials: Experimental and Numerical Investigation

et al. 2022

Self Cite

View full text Add to dashboard Cite

This work focuses on an experimental and numerical investigation into monitoring damage in a cube-shaped concrete specimen under compression. Experimental monitoring uses acoustic emission (AE) signals acquired by two independent measurement apparatuses, and the same damage process is numerically simulated with the lattice discrete element method (LDEM). The results from the experiment and simulation are then compared in terms of their failure load, final configurations, and the evolution of global parameters based on AE signals, such as the b-value coefficient and the natural time approach. It is concluded that the results from the AE analysis present a significant sensitivity to the characteristics of the acquisition systems. However, natural time methods are more robust for determining such differences, indicating the same general tendency for all three data sets.

show abstract

“…The applications of NTA that have appeared up to 2010 have been reviewed in the monograph by Varotsos et al [4], providing examples in various disciplines such as Statistical Physics, Condended Matter Physics, Geophysics, Seismology, Biology, and Cardiology. Since 2011, various newer applications have appeared in a variety of scientific fields, such as condensed matter and materials [17][18][19], geosciences [20][21][22][23][24][25][26][27][28], engineering [29][30][31][32][33][34][35][36], climate change [37][38][39][40], and cosmic rays [41]. Earthquake nowcasting introduced by Rundle et al [42], which is the most recent method for seismic risk estimation by means of the earthquake potential score (EPS), is also based on the concept of natural time.…”

Section: Introductionmentioning

confidence: 99%

Natural Time Analysis of Global Seismicity

et al. 2022

View full text Add to dashboard Cite

Natural time analysis enables the introduction of an order parameter for seismicity, which is just the variance of natural time χ, κ1=⟨χ2⟩−⟨χ⟩2. During the last years, there has been significant progress in the natural time analysis of seismicity. Milestones in this progress are the identification of clearly distiguishable minima of the fluctuations of the order parameter κ1 of seismicity both in the regional and global scale, the emergence of an interrelation between the time correlations of the earthquake (EQ) magnitude time series and these minima, and the introduction by Turcotte, Rundle and coworkers of EQ nowcasting. Here, we apply all these recent advances in the global seismicity by employing the Global Centroid Moment Tensor (GCMT) catalog. We show that the combination of the above three milestones may provide useful precursory information for the time of occurrence and epicenter location of strong EQs with M≥8.5 in GCMT. This can be achieved with high statistical significance (p-values of the order of 10−5), while the epicentral areas lie within a region covering only 4% of that investigated.

show abstract

Long-Range Correlations and Natural Time Series Analyses from Acoustic Emission Signals

Cited by 10 publications

References 54 publications

Spatio-Temporal Distribution of the Sources of Acoustic Events in Notched Fiber-Reinforced Concrete Beams under Three-Point Bending

Spatio-Temporal Distribution of the Sources of Acoustic Events in Notched Fiber-Reinforced Concrete Beams under Three-Point Bending

Analysis of Acoustic Emission Activity during Progressive Failure in Heterogeneous Materials: Experimental and Numerical Investigation

Natural Time Analysis of Global Seismicity

Contact Info

Product

Resources

About