Fracture damage prediction in fissured red sandstone under uniaxial compression: acoustic emission <i>b</i>‐value analysis

Niu, Yong; Zhou, Xiaoping; Zhou, Lunshi

doi:10.1111/ffe.13113

Cited by 72 publications

(42 citation statements)

References 41 publications

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“…[29][30][31] In this field, many scholars have made a contribution to the relationship between AE behaviors and rock damage. [32][33][34][35][36][37][38][39] The AE events inside the rock reflect the processes of the nucleation and evolution of the cracks. Due to the changes of the accumulated number of AE events and energy, the creep characteristics of the rock can be analyzed.…”

Section: Introductionmentioning

confidence: 99%

Creep damage behaviors of red sandstone subjected to uniaxial compression after high‐temperature heat treatment using acoustic emission technology

Pan

Berto

Zhou

2021

Fatigue Fract Eng Mat Struct

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This work discusses the results from tests conducted to investigate the uniaxial compression and creep behavior of red sandstone. An original untreated sample and an 800°C treated sample were selected to carry out the experiments. High temperature had an obvious influence on the mechanical properties of the red sandstone. The relationship between creep strain and instantaneous strain, as well as the instantaneous deformation modulus and creep viscosity coefficient, was analyzed. High temperature reduced the ability of the red sandstone to resist instantaneous deformation and creep deformation. Acoustic emission (AE) technology was also used in the loading process of uniaxial compression and creep tests, providing a powerful means for damage evolutionary analysis of the red sandstone.

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Section: Introductionmentioning

confidence: 99%

Creep damage behaviors of red sandstone subjected to uniaxial compression after high‐temperature heat treatment using acoustic emission technology

Pan

Berto

Zhou

2021

Fatigue Fract Eng Mat Struct

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“…It offers, also, valuable information concerning the time evolution of the acoustic activity just before the failure of the samples, providing direct information on the frequency of micro-cracking activity within the specimen. Quite a few research teams worldwide are already using the F-function to study various aspects of the acoustic activity, especially in brittle materials [20][21][22][23].…”

Section: Analysis In Terms Of the Ib-value And The Cumulative Energy mentioning

confidence: 99%

Fracture precursor phenomena in marble specimens under uniaxial compression by means of Acoustic Emission data

Triantis

Kourkoulis

2019

Frattura Ed Integrità Strutturale

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Marble specimens are subjected to a specially designed stepwise loading protocol, in an attempt to detect fracture precursor phenomena taking advantage of Acoustic Emission (AE) data. The analysis is carried out in terms of the number of acoustic hits recorded and the time evolution of the improved b-value (Ib-value), the cumulative energy of the acoustic signals and the F-function. During the stage of increasing load, intense acoustic activity is detected as the corresponding stress reaches the transitional phase from the linear to the nonlinear mechanical response of the material. When the stress is stabilized at levels exceeding 95% of the material's compressive strength, the acoustic activity is drastically reduced. During the first seconds of the stress stabilization stage the reduction follows an exponential law. Special attention is paid to the phases, where the occurrence of AE hits shows a strong increase. During these phases acoustic signals of low frequency and high RA are recorded, indicating that the micro-cracking process is of shear rather than of opening mode.

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“…The DIC method has potential value for progressing the study of rock mechanics. Therefore, it has been used to some extent in the study of rock failure in recent years 27–29 . For example, in the fracture behavior of both brittle and ductile multi‐flawed rock masses, researchers used DIC technology to reveal the failure mechanism of brittle and ductile multi‐flawed rock masses and obtained the crack coalescence mode and failure mode 30 .…”

Section: Introductionmentioning

confidence: 99%

Study on the fracture behavior of prefabricated fissures granite based on DIC and laser scanning techniques

Hao

et al. 2021

Fatigue Fract Eng Mat Struct

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The initiation, propagation, and coalescence of cracks in the rock bridge are the root causes of rock failure. However, the identification of cracks propagation paths is a problem in rock mechanics. This paper studies the evolutionary law of the strain field in the rock bridge region of granite with pre‐fissures using 3D‐DIC after equivalence and simplification. Based on the real crack initiation mechanism of “relative slip between regions” proposed in this paper, combined with the priority order of crack propagation at the edge of the rock bridge, the pattern of cracks propagation and coalescence was obtained. We analyze the fracture characteristics in roughness and morphology to verify the validity of the proposed mechanism. The tensile and shear failure areas around the rock bridge were identified quantitatively, and the roughness, fractal dimension, and energy consumption of the sections formed by tensile failure and shear failure are different.

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Fracture damage prediction in fissured red sandstone under uniaxial compression: acoustic emission b‐value analysis

Cited by 72 publications

References 41 publications

Creep damage behaviors of red sandstone subjected to uniaxial compression after high‐temperature heat treatment using acoustic emission technology

Creep damage behaviors of red sandstone subjected to uniaxial compression after high‐temperature heat treatment using acoustic emission technology

Fracture precursor phenomena in marble specimens under uniaxial compression by means of Acoustic Emission data

Study on the fracture behavior of prefabricated fissures granite based on DIC and laser scanning techniques

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