Characterization of Elastic Modulus of Granular Materials in a New Designed Uniaxial Oedometric System

Ma, Qinwei; Sandali, Yahya; Zhang, Rui-Nan; Ma, Fang-Yuan; Wang, Hongtao; Ma, Shiping; Shi, Quan

doi:10.1088/0256-307x/33/3/038101

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…The laboratory test is another commonly used method to study rock microproperties. The commonly used test methods include computerized tomography (CT) [ 12 ], scanning electron microscope (SEM) [ 13 ], digital image correlation method (DIC) [ 14 , 15 , 16 , 17 ], and others. CT and SEM are always used to obtain the microstructures and microfractures distribution of the rock.…”

Section: Introductionmentioning

confidence: 99%

Inversion Method of the Young’s Modulus Field and Poisson’s Ratio Field for Rock and Its Test Application

et al. 2022

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As one typical heterogeneous material, the heterogeneity of rock micro parameters has an important effect on its macro mechanical behavior. The study of the heterogeneity of micro parameters is more important to reveal the root cause of deformation and failure. However, as a typical heterogeneous material, the current testing and inversion method is not suitable for micro parameters measurement for the rock. Aiming at obtaining the distribution of micro Young’s modulus and micro Poisson’s ratio of the rock, based on the digital image correlation method (DIC) and finite element method (FEM), this paper proposed a parameter field inversion method, namely the DF-PF inversion method. Its inversion accuracy is verified using numerical simulation and laboratory uniaxial compression test. Considering the influences of heterogeneity, stress state and dimension difference, the average inversion error of Young’s modulus field and Poisson’s ratio field are below 10%, and the proportion of elements with an error of less than 15% accounts for more than 86% in the whole specimen model. Compared with the conventional measuring method, the error of macro Young’s modulus and macro Poisson’s ratio calculated by the DF-PF inversion method is less than 2.8% and 9.07%, respectively. Based on the statistical analysis of Young’s modulus field and Poisson’s ratio field, the parameter homogeneity and quantitative function relation between the micro parameter and the principal strain can also be obtained in laboratory tests. The DF-PF inversion method provides a new effective method of testing Young’s modulus field and Poisson’s ratio field of the rocks under complex stress states.

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Section: Introductionmentioning

confidence: 99%

Inversion Method of the Young’s Modulus Field and Poisson’s Ratio Field for Rock and Its Test Application

et al. 2022

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“…This resistance is related to the shear strength and bulk modulus of the material. Both variables are also studied in soil mechanics using different mechanical assays such as triaxial and uniaxial tests [5][6][7][8]. The shear strength is the maximum shear stress that a material can sustain before failure.…”

Section: Introductionmentioning

confidence: 99%

Contact angle entropy and macroscopic friction in noncohesive two-dimensional granular packings

et al. 2017

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We study the relationship between the granular contact angle distribution and local particle friction on the macroscopic friction and bulk modulus in noncohesive disk packings. Molecular dynamics in two dimensions are used to simulate uniaxial loading-unloading cycles imposed on the granular packings. While macroscopic Mohr friction depends on the granular pack geometric details, it reaches a stationary limit after a finite number of loading-unloading cycles that render well-defined values for bulk modulus, grain coordination, porosity, and friction. For random packings and for all polydispersities analyzed, we found that as interparticle friction increases, the bulk modulus for the limit cycle decreases linearly, while the mean coordination number is reduced and the porosity increased, also as approximately linear functions. On the other hand, the macroscopic Mohr friction increases in a monotonous trend with interparticle friction. The latter result is compared to a theoretical model that assumes the existence of sliding planes corresponding to definite Mohr-friction values. The simulation results for macroscopic friction are well described by the theoretical model that incorporates the local neighbor angle distribution that can be quantified through the contact angle entropy. As local friction is increased, the limit entropy of the neighbor angle distribution is reduced, thus introducing the geometric component to granular friction. Surprisingly, once the limit cycle is reached, the Mohr friction seems to be insensitive to polydispersity as has been recently reported.

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Three-dimensional numerical reconstruction method for irregular structures of granular geomaterials

Huang

et al. 2018

Geomech. Geophys. Geo-energ. Geo-resour.

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Characterization of Elastic Modulus of Granular Materials in a New Designed Uniaxial Oedometric System

Cited by 4 publications

References 12 publications

Inversion Method of the Young’s Modulus Field and Poisson’s Ratio Field for Rock and Its Test Application

Inversion Method of the Young’s Modulus Field and Poisson’s Ratio Field for Rock and Its Test Application

Contact angle entropy and macroscopic friction in noncohesive two-dimensional granular packings

Three-dimensional numerical reconstruction method for irregular structures of granular geomaterials

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