A methodology to determine the elastic properties of anisotropic rocks from a single uniaxial compression test

Nejati, Morteza; Dambly, Marie Luise Texas; Saar, Martin O.

doi:10.1016/j.jrmge.2019.04.004

Cited by 47 publications

(21 citation statements)

References 33 publications

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“…The fabric of the Grimsel granite is indicative of a transversely isotropic material Dutler et al, 2018;Dambly et al, 2019;Nejati et al, 2019). The elastic stress-strain relationships for a transversely isotropic material can be expressed in several forms (see, e.g., Hearmon, 1961, Lekhnitskii, 1963, and Ting, 1996.…”

Section: Skeletal Bulk Modulus Of the Grimsel Granitementioning

confidence: 99%

“…In this particular study, there is no clear statement of the applicable value of the elasticity constants governing transverse isotropy of the Grimsel granite (the degree of anisotropy (E T /E N ) does not exceed 1.25), and the study culminates in the adoption of the isotropic elasticity properties that were indicated previously. The research by and Nejati et al (2019) deals with the estimation of the deformability characteristics of the Grimsel granite based on the transversely isotropic elastic model with principal directions aligned in the stratification planes and normal to the planes (Fig. 2).…”

Section: Skeletal Bulk Modulus Of the Grimsel Granitementioning

confidence: 99%

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A multi-phasic approach for estimating the Biot coefficient for Grimsel granite

Selvadurai

Nejati

2019

Solid Earth

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Abstract. This paper presents an alternative approach for estimating the Biot coefficient for the Grimsel granite, which appeals to the multi-phasic mineralogical composition of the rock. The modelling considers the transversely isotropic nature of the rock that is evident from both the visual appearance of the rock and determined from mechanical testing. Conventionally, estimation of the compressibility of the solid material is performed by fluid saturation of the pore space and pressurization. The drawback of this approach in terms of complicated experimentation and influences of the unsaturated pore space is alleviated by adopting the methods for estimating the solid material compressibility using developments in theories of multi-phase materials. The results of the proposed approach are compared with estimates available in the literature.

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Section: Skeletal Bulk Modulus Of the Grimsel Granitementioning

confidence: 99%

Section: Skeletal Bulk Modulus Of the Grimsel Granitementioning

confidence: 99%

A multi-phasic approach for estimating the Biot coefficient for Grimsel granite

Selvadurai

Nejati

2019

Solid Earth

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show abstract

“…The fabric of the Grimsel granite is indicative of a transversely isotropic material (Nejati, 2018;Dutler et al, 2018;Dambly et al, 2019;Nejati et al, 2019). The elastic stress-strain relationships for a transversely isotropic material can be expressed in several forms (see e.g.…”

Section: Skeletal Bulk Modulus Of the Grimsel Granitementioning

confidence: 99%

“…In this particular study, there is no clear statement of the applicable value of the elasticity constants governing transverse isotropy of the Grimsel granite (the degree of anisotropy (E T /E N ) does not exceed 1.25) and the study culminates in the adoption of the isotropic elasticity properties that were indicated previously. The research by Nejati (2018) and Nejati et al (2019) deals with the estimation of the deformability characteristics of the Grimsel granite based on the transversely isotropic elastic model with principal directions aligned in the stratification planes and normal to the planes (Figure 2). These studies indicate that the Grimsel granite tested also exhibited significant anisotropy and nonlinearity.…”

Section: Skeletal Bulk Modulus Of the Grimsel Granitementioning

confidence: 99%

“…(5), the bulk modulus applicable to the transversely isotropic material can be evaluated objectively. The studies conducted by Nejati (2018) and Nejati et al (2019) provide the following estimates for the elastic constants governing the transversely isotropic elasticity model for the Grimsel granite: E N ≈ 30 GPa; E T ≈ 47 GPa; ν T T ≈ 0.20 GPa; ν NT ≈ 0.10 GPa, Finally, Krietsch et al (2019) conducted a series of experiments on the ISC core plugs, using overcoring and external pressurization of the hollow samples. These authors also give results of uniaxial tests conducted on core plugs extracted either normal or parallel to the foliations (Figure 18 of their paper).…”

Section: Skeletal Bulk Modulus Of the Grimsel Granitementioning

confidence: 99%

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A Multi-phasic Approach for Estimating the Biot Coefficient for Grimsel Granite

Selvadurai¹,

Selvadurai²,

Nejati³

2019

Preprint

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Abstract. This paper presents an alternative approach for estimating the Biot coefficient for the Grimsel granite, which appeals to the multi-phasic mineralogical composition of the rock. The modelling considers the transversely isotropic nature of the rock that is evident from both the visual appearance of the rock and determined from mechanical testing. Conventionally, estimation of the compressibility of the solid material is performed by fluid saturation of the pore space and pressurization. The drawback of this approach in terms of complicated experimentation and influences of the unsaturated pore space is alleviated by adopting the methods for estimating the solid material compressibility using developments in theories for multiphasic elastic composite materials. The results of the proposed approach are used to develop a set of bounds for the Biot coefficient.

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Mechanical Properties of Conducting Printed Nanosheet Network Thin Films Under Uniaxial Compression

Sinnott,

Kelly,

Gabbett

et al. 2023

Advanced Materials

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Thin film networks of solution processed nanosheets show remarkable promise for use in a broad range of applications including strain sensors, energy storage, printed devices, textile electronics and more. While it is known that their electronic properties rely heavily on their morphology, little is known of their mechanical nature, a glaring omission given the effect mechanical deformation has on the morphology of porous systems and the promise of mechanical post processing for tailored properties. Here, we employ a recent advance in thin film mechanical testing called the Layer Compression Test to perform the first in situ analysis of printed nanosheet network compression. Due to the well‐defined deformation geometry of this unique test, we are able to explore the out‐of‐plane elastic, plastic, and creep deformation in these systems, extracting properties of elastic modulus, plastic yield, viscoelasticity, tensile failure and sheet bending vs. slippage under both out of plane uniaxial compression and tension. We characterise these for a range of networks of differing porosities and sheet sizes, for low and high compression, as well as the effect of chemical cross linking. We explore graphene and MoS2 networks, from which the results can be extended to printed nanosheet networks as a whole.This article is protected by copyright. All rights reserved

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A methodology to determine the elastic properties of anisotropic rocks from a single uniaxial compression test

Cited by 47 publications

References 33 publications

A multi-phasic approach for estimating the Biot coefficient for Grimsel granite

A multi-phasic approach for estimating the Biot coefficient for Grimsel granite

A Multi-phasic Approach for Estimating the Biot Coefficient for Grimsel Granite

Mechanical Properties of Conducting Printed Nanosheet Network Thin Films Under Uniaxial Compression

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