Constraints on Anisotropic Parameters in Transversely Isotropic Media and the Extensions to Orthorhombic Media

Li, Lei; Chen, Hao

doi:10.1002/cjg2.1663

Cited by 4 publications

(1 citation statement)

References 35 publications

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“…To obtain the dynamic evolution of surface vertical wells in the area near a reverse fault (Li et al, 2011; Zaheri et al, 2020), a numerical simulation scheme was designed to assess a horizontal section along the coal seam (Figure 7). All data were analyzed in the X direction opposite to the mining direction, while the Y direction pointed to and was perpendicular to the mining direction.…”

Section: General Idea Of Numerical Simulationmentioning

confidence: 99%

Dynamic analysis and numerical simulation of a surface vertical well on the reverse fault side

Qin

Lin

2023

Energy Exploration & Exploitation

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With the help of mechanical models and numerical calculations, the research obtained: (1) the range of compressive shear stress in well bore is in the shape of “dam body” with the dip angle of a reverse fault, also, the magnitude of the compressive shear stress is related to the load factor and the maximum compressive principal stress which have an increasing relationship; (2) the superposition stress of lateral abutment stress and SZZ of a working face is σA, which is related to the distance between reverse faults; (3) the closer the distance to the reverse fault and the greater the vertical well displacement and deformation as the advancement length of the working face increases, the sensitivity to the effects of the reverse fault and mining is: XDISP > ZDISP > YDISP, and the sensitivity to the boundary is such that: ZDISP > YDISP > XIDSP; (4) the closer the distance to the reverse fault and the larger the length of the working face, the greater the displacement and deformation of the vertical well. In addition, the sensitivity to the effects of reverse faults and mining is: XDISP > ZDISP > YDISP; (5) when the working face continues to be mined, the shear stress on the well bore and the circumference of the hole is sensitive to the influences of reverse faults as follows: SXZ > SYZ > SXY; (7) the density of strain energy at the well bore is most sensitive to the lateral distance to the working face strike mining line. Based on these results, it is proposed to arrange large-diameter pressure relief boreholes around the hole and arrange layers to eliminate the influence of the well bore boundary and eliminate the accumulation of shear strain energy around such a well bore.

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Section: General Idea Of Numerical Simulationmentioning

confidence: 99%

Dynamic analysis and numerical simulation of a surface vertical well on the reverse fault side

Qin

Lin

2023

Energy Exploration & Exploitation

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Soft-Elastohydrodynamic Lubrication Line Contact Analysis on a Strip of Bio-Materials

Chen

2019

Journal of Tribology

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The characteristics of anisotropic material, finite deformation, and lubrication in biological system diminish the friction and wear between soft tissues with relative motion. In this research, the lubrication between pleura surfaces in relative motion is analyzed by soft elastohydrodynamic lubrication (soft-EHL) line contact with an equivalent model. The model is a soft, transversely isotropic (TI) elastic strip with finite thickness sliding under a rigid sinusoidal surface, which is used to simulate the surface irregularities, with lubricant in between. The material nonlinearity and the curvature effects due to finite deformation, which are significant in soft-EHL, are considered in the present study. The pressure distribution, film thickness, von Mises stress, and material deformation are analyzed and discussed under various combinations of elastic moduli and Poisson's ratios for the transversely isotropic models. The simulation results reveal that the soft-EHL modeling fit actual result better than the traditional EHL (t-EHL) modeling. The Poisson's ratio νp = 0.1 and νpz = 0.49 situation will have more gentle stress distribution. The present soft-EHL solver can be used to realize some desired stress distributions and to identify the mechanical properties bio-materials under the aids of experiments.

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Impact Elastohydrodynamic Lubrication Analysis of Transversely Isotropic Materials in Point Contact

Nguyen,

2023

Journal of Tribology

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In the traditional elastohydrodynamic lubrication (EHL) field, surface elastic deformation is usually determined using an elastic half-space model for isotropic materials. However, this theory may be inefficient when applied to point contact problems involving inherently anisotropic materials, such as transversely isotropic (TI) materials. Accordingly, the present study proposes a method for solving the EHL point contact problem between a rigid ball and a TI substrate under impact loading using a direct-solving numerical method, in which the mechanical properties of the TI material are expressed in the form of a stiffness matrix. For comparison purposes, the TI material is also approximated as an isotropic material using Turner's approximation method based on the equivalent modulus property of the material. It is shown that the direct-solving method outperforms Turner's approximation in interpreting the mechanical properties of the TI substrate. In addition, it is shown that the initial velocity of the rigid ball and the stiffness of the TI material (i.e., the transverse elastic modulus, longitudinal modulus, and shear modulus) have significant effects on the load, impact velocity, and acceleration of the ball; central pressure and film thickness of the lubricant; and deformation and von Mises stress of the TI substrate, during the impact process. Overall, the results show that the proposed EHL model provides a useful tool for solving impact-EHL problems involving TI materials.

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Constraints on Anisotropic Parameters in Transversely Isotropic Media and the Extensions to Orthorhombic Media

Cited by 4 publications

References 35 publications

Dynamic analysis and numerical simulation of a surface vertical well on the reverse fault side

Dynamic analysis and numerical simulation of a surface vertical well on the reverse fault side

Soft-Elastohydrodynamic Lubrication Line Contact Analysis on a Strip of Bio-Materials

Impact Elastohydrodynamic Lubrication Analysis of Transversely Isotropic Materials in Point Contact

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