Creep experiment and rheological model of deep saturated rock

Liü, Lang; Wang, Ge-ming; Chen, Jianhong; Shan, Yang

doi:10.1016/s1003-6326(13)62488-7

Cited by 45 publications

(23 citation statements)

References 3 publications

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“…Kelvin model, which consists of a spring element and a dashpot element in parallel, usually describes viscoelastic motion of oxide glass, as shown in Figure B. In order to describe all deformation mechanisms of ChG, the above two models are combined as a Schofield‐Scott Blair model, as shown in Figure C. The instantaneous elastic and plastic deformation, delayed elastic and plastic deformation and viscous flow coexist in this model.…”

Section: Methodsmentioning

confidence: 99%

Elastic‐viscoplasticity modeling of the thermo‐mechanical behavior of chalcogenide glass for aspheric lens molding

Zhou

Xie

et al. 2017

Int J of Appl Glass Sci

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Chalcogenide glass (ChG), as an alternative material in place of single‐crystal germanium, is increasingly used in thermal imaging, night vision, and infrared guidance systems, etc., owing to their excellent formability through precision glass molding (PGM). The deformation mechanisms of these glasses at the molding temperature involve elasticity, plasticity, and viscous flow, which call for a new theoretical model to assist the design of PGM process. This paper investigates the thermo‐mechanical properties of Ge22Se58As20 at the temperature above its softening point and establishes a new elastic‐viscoplasticity model to describe its thermo‐mechanical behaviors. After determining the model parameters through cylindrical compression tests, the new constitutive model is implemented in finite element method (FEM) of PGM to form an aspheric ChG lens. And the agreement of displacement‐time curves between experimental and simulation results exhibit the validity of the proposed elastic‐viscoplastic constitutive model.

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Section: Methodsmentioning

confidence: 99%

Elastic‐viscoplasticity modeling of the thermo‐mechanical behavior of chalcogenide glass for aspheric lens molding

Zhou

Xie

et al. 2017

Int J of Appl Glass Sci

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“…By summarizing existing rheological models, Xia et al [16] proposed a unified rheological mechanical model. Relevant studies have shown that model parameters vary during rock creep and are related to stress, time, temperature, and other factors [17,18]. Referring to damage mechanics theory [19,20], Jia et al [21] proposed a nonlinear elastic-viscoplastic damage model based on the modified Mohr-Coulomb criterion.…”

Section: Introductionmentioning

confidence: 99%

Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock‐Like Materials

Lin

Zhang

Wang

et al. 2020

Advances in Civil Engineering

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Creep property is an important mechanical property of rocks. Given the complexity of rock masses, mechanical parameters change with time in the creep process. In this work, a nonlinear function for describing the time-dependent change of parameters was introduced and an improved variable-parameter nonlinear Nishihara shear creep model of rocks was established. By creating rock-like materials, the mechanical properties of rocks under the shear creep test condition were studied, and the deformation characteristics and long-term shear strength of rocks during creep were analyzed. The material parameters of the model were identified using the creep test results. Comparison of the model’s calculated values and experimental data indicated that the model can describe the creep characteristics of rocks well, thus proving the correctness and rationality of the improved model. During shear creep, the mechanical properties of rocks have an aging effect and show hardening characteristics under low shear stress. Furthermore, according to the fact that Gk of the nonlinear model can characterize the creep deformation resistance, a method to determine the long-term shear strength is proposed.

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“…e results of early research into rock mechanics include Hooke's law, Newton's law of viscosity, and Saint Venant's ideal plasticity law. e continuous recognition of progress in understanding the mechanical properties of rock has led investigators to propose a variety of constitutive models by means of a subsequent viscoelastic plastic theory of continuum mechanics, such as that put forward by Liu et al [1]. Based on rheological theory, Liu et al [1] proposed a mechanical constitutive model that can describe the rheology of fully saturated rock.…”

Section: Introductionmentioning

confidence: 99%

“…e continuous recognition of progress in understanding the mechanical properties of rock has led investigators to propose a variety of constitutive models by means of a subsequent viscoelastic plastic theory of continuum mechanics, such as that put forward by Liu et al [1]. Based on rheological theory, Liu et al [1] proposed a mechanical constitutive model that can describe the rheology of fully saturated rock. Fu et al [2] proposed an elastic-plastic constitutive model for soft sedimentary rock by using the conventional elastic-plastic constitutive model and considering the anisotropy and constraint-strain dependence of soft rock.…”

Section: Introductionmentioning

confidence: 99%

Constitutive Model of Rock Uniaxial Damage Based on Rock Strength Statistics

Chen

Guo

2018

Advances in Civil Engineering

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Based on the assumption that rock strength follows the log normal distribution statistically, this paper establishes a damage constitutive model of rock under uniaxial stress conditions in combination with the Mohr–Coulomb strength criterion and damage mechanical theory. Experiments were carried out to investigate the damage evolution process of rock material, which can be categorized into nondamaging, accelerated growth, constant-speed, similar growth, and speed-reducing growth stages. The evolution process had a good corresponding relationship with the rock stress-strain curves. Based on the statistical damage constitutive model proposed in this paper, a numerical fitting analysis was conducted on the uniaxial compression testing data of laboratory sand rock and on experimental data from other literature, in order to validate the rationality of the constitutive equation and the determination of its parameters and to analyze the effect of internal friction variables on damage variables and compression strength. The research outcomes presented in this paper can provide useful reference for the theory of rock mechanics and for rock engineering.

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Creep experiment and rheological model of deep saturated rock

Cited by 45 publications

References 3 publications

Elastic‐viscoplasticity modeling of the thermo‐mechanical behavior of chalcogenide glass for aspheric lens molding

Elastic‐viscoplasticity modeling of the thermo‐mechanical behavior of chalcogenide glass for aspheric lens molding

Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock‐Like Materials

Constitutive Model of Rock Uniaxial Damage Based on Rock Strength Statistics

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