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Journal articles on the topic 'Quasi-brittle geomaterials'

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Author: Grafiati

Published: 10 December 2022

Last updated: 29 January 2023

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1

Suknev, Sergey. "Nonlocal Criteria for Brittle and Quasi-Brittle Fracture of Geomaterials and Rocks." E3S Web of Conferences 56 (2018): 02003. http://dx.doi.org/10.1051/e3sconf/20185602003.

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Nonlocal criteria are used for prediction materials and rock mass failure near stress concentrations (pores, faults, openings, excavations). A common property of nonlocal fracture criteria is the introduction of the intrinsic material length characterizing its microstructure, which allows one to describe the size effect in conditions of stress concentration. At the same time the scope of their application is limited to cases of brittle or quasi-brittle fracture with a small fracture process zone. To expand the scope of the criteria for cases of fracture with a developed fracture process zone, it is proposed to abandon the hypothesis of the size of this zone as a material constant, associated only with the material structure. New fracture criteria are proposed, which are the development of the average stress criterion, and point stress criterion, and which contain a complex parameter that characterizes the size of the fracture process zone and accounts not only for the material structure, but also plastic properties of the material, geometry of the sample, and its loading conditions. Expressions are obtained for the critical pressure in the problem of the formation of tensile cracks under compression in the samples of geomaterials with a circular hole. The calculation results are in good agreement with the experimental data on the fracture of drilled gypsum plates.

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2

Suknev, S. V. "Brittle and Quasi-Brittle Fracture of Geomaterials with Circular Hole in Nonuniform Compression." Journal of Mining Science 56, no. 2 (March 2020): 174–83. http://dx.doi.org/10.1134/s1062739120026625.

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3

Suknev, SV. "Fracture of quasi-brittle geomaterials with a circular hole under compression." IOP Conference Series: Earth and Environmental Science 773, no. 1 (May 1, 2021): 012082. http://dx.doi.org/10.1088/1755-1315/773/1/012082.

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4

Suknev, Sergey V. "THE USE OF NONLOCAL CRITERIA IN FORECASTING FRACTURE OF QUASI-BRITTLE MATERIAL WITH A HOLE UNDER COMPRESSION." Industrial laboratory. Diagnostics of materials 85, no. 4 (May 15, 2019): 50–56. http://dx.doi.org/10.26896/1028-6861-2019-85-4-50-56.

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The study is aimed at the development of the new failure criteria for quasi-brittle materials in conditions of stress concentration. The possibility of using non-local failure criteria for description of the brittle, quasi-brittle and ductile fracture of the materials with notches is analyzed. The general feature of these criteria consists in the introduction of the internal dimension characterizing the structure of the material, which provides the possibility of describing a large-scale effect in conditions of the stress concentration and thereby expand the area of their application compared to traditional criteria though it is limited to the cases of brittle or quasi-brittle fracture with a small pre-ffacture zone. To broaden the scope of their application to quasi-brittle fracture with a developed pre-fracture zone we propose to abandon the hypothesis about the size of the pre-fracture zone as a constant related only to the structure of the material. A number of the new nonlocal criteria, which are the development of the criteria of the mean stress and fictitious crack, are developed, substantiated from the physical standpoint, and proved experimentally. These criteria contain a complex parameter characterizing the size of the pre-fracture zone and taking into account not only the structure, but also the ductile properties of the material, specimen geometry and loading conditions. The expressions for the critical pressure in the problem of tensile crack formation upon compression of the samples of geomaterials with a circular hole are derived. The results of calculations match rather well the experimental data on the destruction of drilled gypsum slabs.

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5

van Mier, Jan G. M., Dominik Meyer, and Hau Kit Man. "Fracture of Quasi-Brittle Materials like Concrete under Compressive Loading." Advanced Materials Research 41-42 (April 2008): 207–14. http://dx.doi.org/10.4028/www.scientific.net/amr.41-42.207.

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Fracture under compression is one of the most commonly studied properties of geomaterials like concrete and rock, in particular since these materials reach their best performance in compression. The fracture process is however rather complex due to the heterogeneous structures of said materials. Over the years fundemental studies of fracture under compression have led to a much improved insight in the details of the fracture process depending on the actual composition of the material. Fracture can be described by means of a 4-stage fracture model, which included as most important aspects pre-peak cracking, which is stable and can be arrested by stiffer and stronger elements in the material structure, and post-peak cracking [1]. The latter macroscopic cracks are basically un-stable and can only be arrested by measures at a structural scale, such as applying confining stress or by using positive geometries. The material structure cannot assist in the arrest of the large energetic cracks other than locally affecting the crack path. In the paper an overview is given of the fracture process in compression. Recently we embarked on studying compressive fracture using a simpler material structure, namely foamed hardened cement paste [2]. Stiff aggregates that are normally included in normal concrete have been left-out; instead a larger than usual quantity of large pores is brought into the material, even up to 80%. Studying fracture processes in this simpler material system ultimately allows for a better understanding of the details of the pre-peak cracking process, which is considered more important than the post-peak process since it defines strength.

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6

Grassl, Peter, and John Bolander. "Three-Dimensional Network Model for Coupling of Fracture and Mass Transport in Quasi-Brittle Geomaterials." Materials 9, no. 9 (September 19, 2016): 782. http://dx.doi.org/10.3390/ma9090782.

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7

You, Tao, Qi-Zhi Zhu, Peng-Fei Li, and Jian-Fu Shao. "Incorporation of tension-compression asymmetry into plastic damage phase-field modeling of quasi brittle geomaterials." International Journal of Plasticity 124 (January 2020): 71–95. http://dx.doi.org/10.1016/j.ijplas.2019.08.003.

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8

You, Tao, Haim Waisman, Wei-Zhong Chen, Jian-Fu Shao, and Qi-Zhi Zhu. "A novel micromechanics-enhanced phase-field model for frictional damage and fracture of quasi-brittle geomaterials." Computer Methods in Applied Mechanics and Engineering 385 (November 2021): 114060. http://dx.doi.org/10.1016/j.cma.2021.114060.

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9

Ren, Lu, Lun-Yang Zhao, and Fu-Jun Niu. "A physically-based elastoplastic damage model for quasi-brittle geomaterials under freeze-thaw cycles and loading." Applied Mathematical Modelling 106 (June 2022): 276–98. http://dx.doi.org/10.1016/j.apm.2022.02.006.

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10

Sun, Bin, Xiaojiang Liu, and Zhao-Dong Xu. "A novel physical continuum damage model for the finite element simulation of crack growth mechanism in quasi-brittle geomaterials." Theoretical and Applied Fracture Mechanics 114 (August 2021): 103030. http://dx.doi.org/10.1016/j.tafmec.2021.103030.

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11

Wang, X. B. "Residual Stress Distribution in Pure Bending Beam Subjected to Tensile Failure on One Side." Materials Science Forum 524-525 (September 2006): 253–58. http://dx.doi.org/10.4028/www.scientific.net/msf.524-525.253.

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The stress distribution on the midsection of a pure bending beam where tensile strain localization band initiates on the tensile side of the beam and propagates within the beam is analyzed. Using the static equilibrium condition on the section of the midspan of the beam and the assumption of plane section as well as the linear softening constitutive relation beyond the tensile strength, the expressions for the length of tensile strain localization band and the distance from the tip of the band to the neutral axis are derived. After superimposing a linear unloading stress distribution over the initial stress distribution, the residual stress distribution on the midsection of the beam is investigated. In the process of strain localization band’s propagation, strain-softening behavior of the band occurs and neutral axis will shift. When the unloading moment is lower, the length of tensile strain localization band remains a constant since the stress on the base side of the beam is tensile stress. While, for larger unloading moment, with an increase of unloading moment, the length of tensile strain localization band decreases and the distance from the initial neutral axis to the unloading neutral axis increases. The neutral axis of midsection of the beam will shift in the unloading process. The present analysis is applicable to some metal materials and many quasi-brittle geomaterials (rocks and concrete, etc) in which tensile strength is lower than compressive strength. The present investigation is limited to the case of no real crack. Moreover, the present investigation is limited to the case that the length of strain localization band before unloading is less than half of depth of the beam. Otherwise, the residual tensile stress above the elastic neutral axis will be greater than the tensile strength, leading to the further development of tensile strain localization band in the unloading process.

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12

Massart, T. J., and A. P. S. Selvadurai. "Stress-induced permeability evolution in a quasi-brittle geomaterial." Journal of Geophysical Research: Solid Earth 117, B7 (July 2012): n/a. http://dx.doi.org/10.1029/2012jb009251.

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13

Suknev, S. V. "Fracture of Quasi-Brittle Geomaterial with a Circular Hole under Non-Uniformly Distributed Compression." Journal of Applied Mechanics and Technical Physics 60, no. 6 (November 2019): 1115–24. http://dx.doi.org/10.1134/s0021894419060178.

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14

Li, Cunbao, Dongchao Yang, Heping Xie, Li Ren, and Jun Wang. "Size effect of fracture characteristics for anisotropic quasi-brittle geomaterials." International Journal of Mining Science and Technology, December 2022. http://dx.doi.org/10.1016/j.ijmst.2022.11.004.

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15

"Brittle and Quasi-Brittle Fracture of Geomaterials with Circular Hole in Non-Uniform Compression." Физико-технические проблемы разработки полезных ископаемых, no. 2 (2020). http://dx.doi.org/10.15372/ftprpi20200203.

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16

Saramito, Piere, Véronique Dansereau, and Jérôme Weiss. "Linking bulk modulus to an unilateral damage yield criterion: A thermodynamic modeling approach." International Journal of Damage Mechanics, February 18, 2021, 105678952199120. http://dx.doi.org/10.1177/1056789521991201.

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This work presents a new damage criterion suitable for elastic, elastic-plastic/viscous or elastic-viscous-plastic materials involving rupture effects. Its derivation, made here within a thermodynamic framework, follows previous scalar-valued damage mechanics approaches. Such approaches are appropriate to many geophysical problems involving quasi-brittle materials for which there is no clear physical justification for the level of complexity of a tensorial damage variable. Distinction between the mechanical response to compressive and tensile stresses is therefore not introduced by the damage itself but via a special definition of the Helmholtz free energy. This scheme differs from previous ones in that it combines with an evolution of Poisson’s ratio with the level of damage, which allows expressing the damage criterion in the principal stresses space. Moreover, there is no need to compute the stress eigensystem, which makes it simpler to implement than the Mohr–Coulomb damage criterion. Here we derive this damage criterion and compare it to observations of the variations of the bulk modulus in damaged geomaterials. We also compare it to in-situ stress measurements and find a good agreement in terms of the shape of the criterion in the stress space. We tentatively interpret the results in the context of previous studies of rock and ice mechanics.

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17

"Fracture of Quasi-Brittle Geomaterial with a Circular Hole under Non-Uniformly Distributed Compression." Прикладная механика и техническая физика, no. 6 (2019). http://dx.doi.org/10.15372/pmtf20190617.

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