Implementation of a coupled plastic damage distinct lattice spring model for dynamic crack propagation in geomaterials

Jiang, Chao; Zhao, Gao‐Feng

doi:10.1002/nag.2761

Cited by 15 publications

(4 citation statements)

References 28 publications

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“…The 3DP can transform digital models of rock masses into experimental models, thus providing the possibility of repeated failure tests on the complex structure of rock mass. Similarly, the 3D digital models can also be imported into the numerical software for numerical calculations, such as the finite element [123][124][125] and discrete element [126] analysis. Therefore, the 3DP is compatible with the laboratory tests and numerical simulations and can be regarded as a virtual bridge connecting laboratory tests and numerical simulations.…”

Section: Integration Of 3dp and Numericalmentioning

confidence: 99%

“…The stress freezing technique is an effective method for quantitatively analyzing the three-dimensional stress field within a complex solid structure. The property of isotropic stress or isotropic stripes caused by external loads in a warmed environment can be "frozen" and recorded when the specimen returns to room temperature [30,[126][127][128].…”

Section: Integration Of 3dp and The Stress Freezing Techniquementioning

confidence: 99%

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Application of 3D Printing Technology in the Mechanical Testing of Complex Structural Rock Masses

et al. 2021

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In the engineering of underground construction, the discontinuous structures in rock mass have important influences on the mechanical behaviors of the subsurface of rock mass. The acquisition of mechanical parameters is the basis of rock mass engineering design, construction, safety, and stability evaluation. However, the mechanical parameters and failure characteristics of the same rock mass under different mechanical conditions cannot be obtained due to the limitations of specimen preparation techniques. In recent years, with the continuous development of 3D printing (3DP) technology, it has been successfully applied to the repetitive preparation of rock mass samples. The combinations of 3DP and other techniques, such as 3D scanning and CT scanning, provided a new approach to study the mechanical behavior of complex structural rock masses. In this study, through a comprehensive review of the technical progress, equipment situation, application fields, and challenges of the use of 3DP technology, the following conclusions were obtained: (1) 3DP technology has advantages over traditional rock mass specimen preparation techniques, and the verification of test results using 3D printed samples shows that the 3DP has broad application prospects in geotechnical engineering. (2) The combination of 3DP and other advanced techniques can be used to achieve the accurate reconstruction of complex structural rock masses and to obtain the mechanical and failure characteristics of the same rock mass structure under different mechanical boundary conditions. (3) The development of 3DP materials with high strength, high brittleness, and low ductility has become the major bottleneck in the application of 3DP in geotechnical engineering. (4) 3D printers need to meet the high precision and large size requirements while also having high strength and long-term printing ability. The development of 3D printers that can print different types of materials is also an important aspect of the application of 3DP in geotechnical engineering.

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Section: Integration Of 3dp and Numericalmentioning

confidence: 99%

Section: Integration Of 3dp and The Stress Freezing Techniquementioning

confidence: 99%

Application of 3D Printing Technology in the Mechanical Testing of Complex Structural Rock Masses

et al. 2021

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“…As shown in the first column in Figure 6, the TWCs are subject to the inclination angle in Refs. [2][3][4][5][6][7][8][10][11][12]17,30,31. In a specimen with the horizontal fissure in Figure 6A, two TWCs initiate around the middle of the fissure surface; the upper TWC begins to propagate from the center-left surface of the fissure, while the lower TWC initiates from the center-right fissure surface.…”

Section: Initiation Of Tensile Wing Cracksmentioning

confidence: 99%

Morphological aspects of crack growth in rock materials with various flaws

Lee

Hong

2019

Num Anal Meth Geomechanics

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Summary Crack evolution is initiated by the occurrence of tensile wing cracks and is then further promoted due to the crack coalescence caused by the extension of a central tensile crack segment between two relatively adjacent flaws. To understand such progressive failures in rock, a parallelized peridynamics coupled with a finite element method is utilized. Through this method, the initiation position of tensile wing cracks is observed with respect to varying inclination angles of a flaw, and then its corresponding shifting mechanism is investigated. In addition, the phenomenon of the position shifting being sensitive to various flaw shapes is discussed. Moreover, it is observed that the inclination angle of a central flaw affects the initiation position of other flaws; therefore, the initiation positions of tensile wing crack emanating from other neighboring flaws are analyzed with their angles. Following tensile wing cracks, a central tensile crack segment occurs in the bridging region between a central flaw and other neighboring flaws; the developmental patterns caused by the crack segment are discussed as well. Finally, the role a central tensile crack segment plays in the formation of crack coalescence and specimen failure is investigated in detail. The numerical results in this paper demonstrate good fidelity with established physical test results and complement them, thereby expanding the understanding of fracturing morphology in rock specimens with various flaws.

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“…Lattice spring models [11][12][13] are based, in principle, on the atomic lattice models originating from condensed matter physics. Due to the explicit representation of local spring-like interactions between discrete particles, 14 LSM has the natural advantage of simulating the mechanical response of coarse-grained materials.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior of porous solid considering mesoscopic elastic buckling

Zhang

Zhao

2020

Num Anal Meth Geomechanics

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Summary In this work, the elastic buckling of porous solids was investigated using a lattice spring model (LSM). The capability of the LSM to solve elastic buckling problems was comprehensively verified by comparing well‐established numerical and analytical solutions. Following this, the buckling of a porous solid was studied, in which two porous structures were considered, ie, the random porous model and the Voronoi porous model. The results reveal that both the porosity and the shape of the pores influence the elastic buckling bearing capacity of the porous solid. Finally, the mechanical responses of a porous solid with an extra high porosity (0.85) were numerically investigated. Our numerical results demonstrated that the nonlinear elastic response of the porous solid might come from its mesoscale elastic buckling. This work shows the ability and promise of using the LSM as a fundamental numerical tool for the deep investigation of the buckling mechanical behavior of porous solids.

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Implementation of a coupled plastic damage distinct lattice spring model for dynamic crack propagation in geomaterials

Cited by 15 publications

References 28 publications

Application of 3D Printing Technology in the Mechanical Testing of Complex Structural Rock Masses

Application of 3D Printing Technology in the Mechanical Testing of Complex Structural Rock Masses

Morphological aspects of crack growth in rock materials with various flaws

Mechanical behavior of porous solid considering mesoscopic elastic buckling

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