A Study on the Fracture of Cementitious Materials in Terms of the Rate of Acoustic Emissions in the Natural Time Domain

Triantis, Dimos; Loukidis, Andronikos; Pasiou, Ermioni D.; Kourkoulis, Stavros K.

doi:10.3390/app13106261

Cited by 4 publications

(3 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is well documented [ 48 , 51 ] that Natural Time is a useful tool that extracts hidden information from a time series of events, the energy content of which varies within broad limits. In this context, a series of recent studies takes advantage of the Natural Time concept in order to analyze the energy content of the acoustic signals (recorded while specimens or structural members are mechanically loaded) and detect the time instant at which the loaded system is entering into its critical state, thus, announcing upcoming catastrophic failure [ 52 , 53 , 54 , 55 , 56 , 57 , 58 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Revealing the Proximity of Concrete Specimens to Their Critical Damage Level by Exploring the Cumulative Counts of the Acoustic Emissions in the Natural Time Domain

Triantis,

Pasiou,

Stavrakas

et al. 2024

Materials

Self Cite

View full text Add to dashboard Cite

This study aims to explore the possibility of detecting indices that could potentially provide warning about the proximity of internal damage to critical levels, beyond which catastrophic fracture is impending. In this direction, advantage was taken of the Cumulative Counts that were recorded during the mechanical loading of specimens made of either plain or fiber-reinforced concrete. The parameter adopted for the analysis was the average rate of change in the Cumulative Counts. Τhe evolution of the specific parameter was considered in the Natural Time Domain, rather than in the conventional time domain. Experimental data from already published three-point bending protocols were used. It was revealed that the specific parameter attains, systematically, a limiting value equal to unity exactly at the instant at which the load reaches its maximum value, which is not identical to the load recorded at the instant of fracture. Similar observations were made for a complementary protocol with uniaxially compressed mortar specimens. The conclusions drawn were supported by the b-values analysis of the respective acoustic data, again in terms of Natural Time. It is, thus, indicated that the evolution of the average rate of change in the Cumulative Counts in the Natural Time Domain provides an index about the proximity of the applied load to a value beyond which the specimen enters into the critical state of impending fracture.

show abstract

Section: Introductionmentioning

confidence: 99%

“…The study of the d[CC(χ)]/dχ function is achieved by means of the “sliding window” procedure, similar to that adopted recently for the analysis of the evolution of the F-function [ 35 ] in the Natural Time Domain, as it is analytically described in ref. [ 58 ].…”

Section: Introductionmentioning

confidence: 99%

Revealing the Proximity of Concrete Specimens to Their Critical Damage Level by Exploring the Cumulative Counts of the Acoustic Emissions in the Natural Time Domain

Triantis,

Pasiou,

Stavrakas

et al. 2024

Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…Triantis D et al [25] explored the possibility of detecting indices through a discussion of parameter-specific variations in the natural time domain, showing that the evolution of the average rate of change of the cumulative counts in the natural time domain of impending catastrophe provides an indicator of whether or not the applied load is approaching the value at which the specimen enters the critical state of impending fracture. Triantis D et al [26] analyzed the acoustic emissivity based on the natural time concept and analyzes the experimental data of cementitious materials under three-point bending, concluding that if the acoustic activity is described with the help of Ffunctions in the natural time domain, its evolution is governed by a power law independent of the geometrical details and of the type of loading scheme, and that the validity of this law seems to provide an interesting pre-failure indicator. Loukidis A et al [27] employed a natural time concept to describe the temporal evolution of the F function, whose value increases gradually with fluctuations of different intensities; however, a power law seems to systematically govern the response of the loaded structure as fracture approaches, which provides a useful pre-fracture signal.…”

Section: Introductionmentioning

confidence: 99%

Analysis of critical states based on acoustic emission signals during progressive failure of wood

Jia,

LI,

Zhang

et al. 2024

PLoS ONE

View full text Add to dashboard Cite

The analysis of critical states during fracture of wood materials is crucial for wood building safety monitoring, wood processing, etc. In this paper, beech and camphor pine are selected as the research objects, and the acoustic emission signals during the fracture process of the specimens are analyzed by three-point bending load experiments. On the one hand, the critical state interval of a complex acoustic emission signal system is determined by selecting characteristic parameters in the natural time domain. On the other hand, an improved method of b_value analysis in the natural time domain is proposed based on the characteristics of the acoustic emission signal. The K-value, which represents the beginning of the critical state of a complex acoustic emission signal system, is further defined by the improved method of b_value in the natural time domain. For beech, the analysis of critical state time based on characteristic parameters can predict the “collapse” time 8.01 s in advance, while for camphor pines, 3.74 s in advance. K-value can be analyzed at least 3 s in advance of the system “crash” time for beech and 4 s in advance of the system “crash” time for camphor pine. The results show that compared with traditional time-domain acoustic emission signal analysis, natural time-domain acoustic emission signal analysis can discover more available feature information to characterize the state of the signal. Both the characteristic parameters and Natural_Time_b_value analysis in the natural time domain can effectively characterize the time when the complex acoustic emission signal system enters the critical state. Critical state analysis can provide new ideas for wood health monitoring and complex signal processing, etc.

show abstract

Identifying impending failure in heterogeneous materials: A study on acoustic emission time series

Friedrich,

Cezar,

Colpo

et al. 2024

Chaos, Solitons & Fractals

View full text Add to dashboard Cite

A Study on the Fracture of Cementitious Materials in Terms of the Rate of Acoustic Emissions in the Natural Time Domain

Cited by 4 publications

References 30 publications

Revealing the Proximity of Concrete Specimens to Their Critical Damage Level by Exploring the Cumulative Counts of the Acoustic Emissions in the Natural Time Domain

Revealing the Proximity of Concrete Specimens to Their Critical Damage Level by Exploring the Cumulative Counts of the Acoustic Emissions in the Natural Time Domain

Analysis of critical states based on acoustic emission signals during progressive failure of wood

Identifying impending failure in heterogeneous materials: A study on acoustic emission time series

Contact Info

Product

Resources

About