Effect of creep load on fatigue behavior and acoustic emission characteristics of sandstone containing pre-existing crack during fatigue loading

Shi, Zhanming; Li, Jiangteng; Ju, Wang

doi:10.1016/j.tafmec.2022.103296

Cited by 35 publications

(12 citation statements)

References 45 publications

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“…It is worth noting that fracture events are often accompanied with acoustic emission signals. From this point of view, fracture bursts are the measurable quantity that could be monitored by acoustic emission techniques [34][35][36].…”

Section: Resultsmentioning

confidence: 99%

Analogy of scaling law for heterogeneous interfacial fracture to explain the Gutenberg–Richter formula for earthquakes

Du¹,

Zhao²,

Hou³

et al. 2022

J. Stat. Mech.

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We propose a new approach for the statistical law due to the fracture of a heterogeneous interface involving spatial correlation of disorders. The dynamic process of interfacial fracture is governed by three coupled integral equations, which further become a system of linear algebraic equations after discretizing the interface to a set of prismatic elements. By tuning parameters, this model covers the whole cases of interfacial fracture from local-load-sharing to almost equal-load-sharing, extending the classical fiber bundle models to a general form. Numerical simulations present that in all cases, the statistical frequency distribution of bursts follows a power law with the exponent in the range (1.5, 2.5), the corresponding b-value in (0.75, 2.25), which well explains the empirical Gutenberg–Richter scaling. The exponent depends on stiffness of elastic spaces, heterogeneous properties of interface, and the distribution of displacements induced by loading. Furthermore, the exponent drops temporally with the evolution of fracture, to its final value before rupture of interface, a phenomenon that may be treated as a precursor for imminent catastrophic failure.

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Section: Resultsmentioning

confidence: 99%

Analogy of scaling law for heterogeneous interfacial fracture to explain the Gutenberg–Richter formula for earthquakes

Du¹,

Zhao²,

Hou³

et al. 2022

J. Stat. Mech.

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“…Luo et al [6] analyzed the shear creep characteristics of the structural surface of a natural red sandstone rock body through three-dimensional morphology scanning of the structural surface and the graded-loading shear creep test. Shi [7] et al carried out graded-loading creep testing on red sandstone containing a single fissure and analyzed the specimen's behavior under creep loading from a macro-fine viewpoint using acoustic emission, digital scattering, and SEM techniques. Li et al [8] introduced damage variables into constitutive relations and creep equations based on Kachanov's creep damage theory to describe the creep process in a fissured rock body and derived an equation for the evolution of the damage variables over time during the creep process.…”

Section: Introductionmentioning

confidence: 99%

Simulation analysis of the evolution law of creep rupture crack extension in X-fractured rock body

zhao,

wei,

sun

et al. 2024

Preprint

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Creep is the macroscopic manifestation of the process of generation, expansion, and penetration of microscopic cracks in a rock body. In this study, the GDEM continuous–discontinuous numerical simulation software was used to model a rock body containing X-type fissures for the purposes of exploring creep crack expansion and rupture in the rock body, analyzing the effects of various factors on X-type fissures in the rock body under the rule of change of the creep curve, and assessing the influences of the intersection angle of the fissure and other factors on the non-parallel fissure rock body on the creep rupture process. The results show that an X-type fissure rock body exhibits a mixed tensile–shear damage mode, with tensile damage being the main type of damage. In the isotropic creep stage of a rock body with X-type fissures, the steady-state creep rate initially increases and then decreases as the sub-fissure length increases, with the change of the fissure angle of the creep rate of the w-type; the sub-fissure length of h is 14mm, the rock body is the first to enter into the accelerated creep stage, for the different fissure intersection angle of the rock body For the rock mass with different fracture angles, the time sequence of entering the accelerated creep stage is consistent with the creep rate; when the fracture intersection angle is 45°, and the sub-fracture length is 12mm, the rock mass has the largest degree of fragmentation, which has a significant impact on the creep damage; after using a single variable processing, it is found that the fracture intersection angle, the sub-fracture length and other factors compared to the fracture intersection angle has a greater impact on the creep damage of the X-type fissure rock mass. This paper can provide theoretical basis and reference for the study of rock engineering creep damage law and mechanical properties of X-type rift rock body.

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“…Acoustic emission (AE) and digital image correlation (DIC) [18][19][20] is a nondestructive testing method to characterize the fracture process of composite materials. Acoustic emission 21 technology mainly detects the development of internal failures, and DIC 22 uses strain cloud maps to observe the failure patterns and failure characteristics of the surface. Yeran et al 23 combined AE technology and DIC method to study the dynamic damage process and bending response of woven spacer structure reinforced sandwich composites (WSRS).…”

Section: Introductionmentioning

confidence: 99%

Research and prediction of creep behavior of triaxial warp‐knitted composites by time–temperature equivalent principle

You,

Gao,

et al. 2023

Polymer Composites

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In this paper, the creep behavior of triaxial warp‐knitted composites (TWKC) was investigated. The TWKC specimens were prepared by applying vacuum‐assisted resin infusion (VARI), and the three‐point bending creep experiments at different temperatures were carried out. The shift factor was calculated based on the activation energy method, and the creep curve at 25°C within 105s was obtained according to the time–temperature equivalence principle, the time–temperature equivalent model was established, and the model was verified by measuring the long‐term creep data with self‐made instrument. There is approximately agreement between the prediction result and experimental one, which is less than 10% within 105s. The results show that the model could be used to predict the creep behavior of TWKC. The viscoelastic properties of the specimen were analyzed based on dynamic mechanical analysis (DMA), and the creep behavior of TWKC was further analyzed by acoustic emission and digital image correlation damage analysis.Highlights The viscoelasticity of TWKC was analyzed based on dynamic mechanical analysis (DMA), and the activation energy was calculated. Based on the activation energy method, the time–temperature equivalent model was established to predict the creep behavior of TWKC. The creep behavior of TWKC were further analyzed by acoustic emission (AE) and digital image correlation (DIC) damage analysis.

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Effect of creep load on fatigue behavior and acoustic emission characteristics of sandstone containing pre-existing crack during fatigue loading

Cited by 35 publications

References 45 publications

Analogy of scaling law for heterogeneous interfacial fracture to explain the Gutenberg–Richter formula for earthquakes

Analogy of scaling law for heterogeneous interfacial fracture to explain the Gutenberg–Richter formula for earthquakes

Simulation analysis of the evolution law of creep rupture crack extension in X-fractured rock body

Research and prediction of creep behavior of triaxial warp‐knitted composites by time–temperature equivalent principle

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