Energy dissipation during fracturing process of nuclear graphite based on cohesive crack model

Tang, Yuxiang; Su, R.K.L.; Chen, H.N.

doi:10.1016/j.engfracmech.2020.107426

Cited by 13 publications

(4 citation statements)

References 45 publications

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“…As can be seen, an obvious displacement jump occurs around the center-notch, caused by the crack opening. Away from the center position, the displacement distribution becomes continuous since there is still in the elastic state [53,62]. The COD can be obtained by subtracting u at both sides of the crack face.…”

Section: Rs Content Rp Contentmentioning

confidence: 99%

Effect of carbonation treatment on fracture behavior of low-carbon mortar with recycled sand and recycled powder

Tang

Xiao

Wang

et al. 2023

Cement and Concrete Composites

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Section: Rs Content Rp Contentmentioning

confidence: 99%

Effect of carbonation treatment on fracture behavior of low-carbon mortar with recycled sand and recycled powder

Tang

Xiao

Wang

et al. 2023

Cement and Concrete Composites

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“…Tang et al [15] deduced the crack growth characteristics of nuclear graphite by three-point bending tests, and the law of crack initiation and growth was identified by the relationship between crack opening displacement and crack length. Subsequently, Tang et al [16] studied the pattern of graphite crack initiation and growth using electronic speckle pattern interferometry. Bajpai et al [17] discussed the brittle fracture characteristics of the material based on the chip morphology produced by pyrolytic carbon during orthogonal micro-grooving.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Modelling and Experimental Validation of the Graphite Cutting Process

Yang,

Wei,

Wang

et al. 2023

Processes

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Graphite is extensively used in the engineering field due to its unique properties, and the study of its cutting mechanism has become particularly important. However, the brittle fracture mechanism of graphite makes it rather easy for cracks with a unique pattern of initiation and growth to develop when processing. Herein, the ABAQUS was selected to establish a finite element model (FEM) of the graphite cutting process. The internal crystal structure of graphite was modelled by a Voronoi structure, and a cohesion unit was globally embedded into the solid unit to simulate crack initiation and growth. In addition, the complete process of chip formation and removal was demonstrated. The analysis of the simulation results showed that the graphite material underwent three periodic cycles of material removal during the cutting process, i.e., large, tiny, and small removal stages. Meanwhile, the simulation results indicated that when ac was large enough, the crack gradually grew inside the graphite and then turned to the upper surface of the graphite. However, when ac was tiny enough, the cracks hardly expanded towards the inside of the graphite but grew upwards for a short period. Then, orthogonal cutting experiments of graphite were conducted, and the FEM was verified based on the experimental chip morphology, machined surface morphology, and current geometric model of the graphite cutting process. The simulation and experimental results were consistent. The hereby-presented FEM was a complement to simulations of the processing of brittle materials.

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“…The deformation and failure of rocks are caused by the continuous input of external energy (Tang et al, 2021), therefore, the study of the failure process of rocks from the perspective of energy is conducive to exploring the mechanical mechanism of its failure. Yu et al (2022) discussed the relationship among the strain energy, volume fraction, confining pressure and failure mode of the backfill-encased-rock through triaxial compression test, acoustic emission, and microscopic tomography.…”

Section: Introductionmentioning

confidence: 99%

“…Bertram and Kalthoff (2003) found that the energy dissipated by a crack propagating at a high velocity was almost two orders of magnitude larger than the energy to initiate a crack. The relationship between energy dissipation and fracture mechanism in graphite fracture zone was evaluated by a tri-linear softening model (Tang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Failure characteristics and the law of the energy evolution of granite with different pre-crack inclination angles under uniaxial compression loading

Zhao

Zhang

et al. 2023

Front. Earth Sci.

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Cracks affect the strength of rock masses and eventually threaten their stability in engineering. In order to study the fracture characteristics and mechanical properties of cracked rocks, uniaxial compression tests of pre-cracked granite samples with a central circular through hole were carried out by using MTS816 rock mechanics testing system. The inclination angles of different pre-cracks are 0°, 15°, 30°, 45°, 60°, 75°, and 90° respectively, and the influence of the crack stop hole near the crack tip on the failure behavior of pre-cracked samples is also considered. The results indicate that, compared with the intact sample, the peak strength of pre-cracked samples decreases significantly and is related to the pre-crack inclination angle. The failure mode of the sample varies with the pre-crack inclination angle, and the crack stop hole near the crack tip also has a certain influence on the crack growth to a certain extent. However, in terms of failure mode and its transformation law, the influence of central circular through hole and crack stop hole can be ignored. Generally speaking, the larger the inclination angle of the pre-crack, the more the total energy required for failure of the sample, and the more the stored elastic strain energy. Before the peak strength, the elastic strain energy of the sample is greater than the dissipated energy, after the peak strength, the dissipated energy gradually exceeds the elastic strain energy due to energy conversion. It is found that the pre-crack reduces the energy storage capacity of the sample, and the total energy is ultimately dominated by sample integrity. The dissipated energy rate increases first, then decreases, and finally increases again, the inflection points are the end of micro-crack closure and the peak strength, respectively. The crack stop hole changes the law of energy evolution to a certain extent, which can improve the ability of rocks to accumulate energy when designed at an appropriate position, so as to improve its load-bearing capacity in a certain range. The results display the mechanical properties of pre-cracked granite samples under uniaxial compression and are conducive to its application in engineering.

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Energy dissipation during fracturing process of nuclear graphite based on cohesive crack model

Cited by 13 publications

References 45 publications

Effect of carbonation treatment on fracture behavior of low-carbon mortar with recycled sand and recycled powder

Effect of carbonation treatment on fracture behavior of low-carbon mortar with recycled sand and recycled powder

Finite Element Modelling and Experimental Validation of the Graphite Cutting Process

Failure characteristics and the law of the energy evolution of granite with different pre-crack inclination angles under uniaxial compression loading

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