Elastic modulus of claystone evaluated by nano-/micro-indentation tests and meso-compression tests

Auvray, Christophe; Lafrance, Noémie; Bartier, Danièle

doi:10.1016/j.jrmge.2016.02.002

Cited by 25 publications

(7 citation statements)

References 35 publications

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“…The average value and the standard deviation of the elastic modulus of the rod-shaped object are obtained by using Equation (12) and Equation (13). According to the 3 times standard deviation criterion, the gross errors should be removed.…”

Section: Nmentioning

confidence: 99%

“…Xu Jia-bin and others proposed the bending resonance method to measure the Young's modulus of the material [11] . Christophe Auvray et al evaluated the Elastic modulus of claystone by nano-/micro-indentation tests and meso-compression tests [12] . LI Ming-xiang proposed the measurement of Young's modulus of materials by laser interferometry based on the principle of double beam interference [13] .…”

Section: Introductionmentioning

confidence: 99%

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Elastic modulus measurement of the rod-shaped object based on image processing

Chen

et al. 2018

MATEC Web Conf.

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Abstract. Aiming at the problem of the method that demands a high accuracy of the equipment with a high price and low generality in measuring the elastic modulus by using the direct method, a device and a method are proposed to measure the elastic modulus of the rod-shaped object based on image processing. The image of the rod-shaped object is gotten using the proposed measurement device. The coordinates of the point on the contour line and the centroid of the cross-section of the rod-shaped object are extracted by using the object image with loading and no-loading respectively. The elastic modulus is computed by using the deflection difference formula. Finally an example is given to verify the feasibility and effectiveness of the device and method that lay a solid foundation for future study of the rod-shaped object elastic modulus measurement.

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Section: Nmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Elastic modulus measurement of the rod-shaped object based on image processing

Chen

et al. 2018

MATEC Web Conf.

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“…Taking Chinese sub-bituminous coal as an example, the relationship between its morphologies and its nano-mechanical properties was investigated (Zhang et al 2018a, b, c); Meng et al and Sun et al calculated the mean values of the nanoindentation mechanical parameters to represent that of standard coal samples (Meng et al 2020;Sun et al 2020a, b) and discussed the influence of quartz and kaolinite on the mechanical properties of coal matrix (Sun et al 2020a, b). For mudstone samples, the nanoindentation technique can test the elastic and plastic mechanics of its minerals (Magnenet et al 2011) and reveal its heterogeneity (Auvray et al 2017;Zhang et al 2018a, b, c). However, all geomaterials also exhibit a viscoelastic response, which has encouraged researchers to improve the utilization of this technique on capturing and modelling the creep characteristics of geomaterials.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the nanoindentation viscoelastic constitutive model of quartz and kaolinite in mudstone

Sun

Gomah

et al. 2021

Int J Coal Sci Technol

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The creep behaviors in deep underground engineering structures, especially in soft rocks, have a remarkable impact on the long-term stability of the excavations, which finally leads to the high risk and failure of it. Accordingly, it is essential to recognize the time-dependent deformation through the investigation of this phenomenon. In this study, the creep behaviors of soft rocks were examined to help understand the underlying mechanism of the extended time-dependent deformation. Due to the limited results about the time-dependent properties of the constituents of the rock that reveal their heterogeneity, the targeting nanoindentation technique (TNIT), was adopted to investigate the viscoelastic characteristics of kaolinite and quartz in a two-constituent mudstone sample. The TNIT consists of identifications of mineralogical ingredients in mudstone and nanoindentation experiments on each identified constituent. After conducting experiments, the unloading stages of the typical indentation curves were analyzed to calculate the hardness and elastic modulus of both elements in mudstone. Additionally, the 180 s load-holding stages with the peak load of 50 mN were transformed into the typical creep strain–time curves for fitting analysis by using the Kelvin model, the standard viscoelastic model, and the extended viscoelastic model. Fitting results show that the standard viscoelastic model not only can perfectly express the nanoindentation creep behaviors of both kaolinite and quartz but also can produce suitable constants used to measure their creep parameters. The creep parameters of kaolinite are much smaller than that of quartz, which causes the considerable time-dependent deformation of the soft mudstone. Eventually, the standard viscoelastic model was also verified on the quartz in a sandstone sample.

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“…Sun, Li, Zhang, et al, 2020) and discussed the influence of quartz and kaolinite on the mechanical properties of coal matrix(C. Sun, Li, Gomah, et al, 2020). For mudstone samples, the nanoindentation technique can test the elastic and plastic mechanics of its minerals (Magnenet et al, 2011) and reveal its heterogeneity (Auvray et al, 2017;F. Zhang, Guo, et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the nanoindentation viscoelastic constitutive model of quartz and kaolinite in mudstone

Sun

Li²,

Elgharib

et al. 2020

Preprint

View full text Add to dashboard Cite

The creep behaviors in deep underground engineering structures, especially in soft rocks, have a remarkable impact on the long-term stability of the excavations, which finally leads to the high risk and failure of it. Accordingly, it is essential to recognize the time-dependent deformation through the investigation of this phenomenon. In this study, the creep behaviors of soft rocks have been widely examined to help understand the underlying mechanism of the extended time-dependent deformation. Due to the limited results about the time-dependent properties of the constituents of the rock that reveal their heterogeneity, the targeting nanoindentation technique (TNIT), was adopted to investigate the viscoelastic characteristics of kaolinite and quartz in a two-constituent mudstone sample. The TNIT consists of identifications of mineralogical ingredients in mudstone with nanoindentation experiments on each identified constituent. After conducting experiments, the unloading stages of the typical indentation curves were analyzed to calculate the hardness and elastic modulus of both elements in mudstone. Additionally, the 180 s load-holding stages with the peak load of 50 mN were transformed into the typical creep strain-time curves for fitting analysis by using the Kelvin model, the standard viscoelastic model, and the extended viscoelastic model. Fitting results show that the standard viscoelastic model not only can perfectly express the nanoindentation creep behaviors of both kaolinite and quartz but also can produce suitable constants used to measure their creep parameters. Furthermore, the creep parameters of kaolinite are much smaller than that of quartz, which causes the considerable time-dependent deformation of the soft mudstone. Eventually, the standard viscoelastic model was also verified on the quartz in a sandstone sample.

show abstract

Elastic modulus of claystone evaluated by nano-/micro-indentation tests and meso-compression tests

Cited by 25 publications

References 35 publications

Elastic modulus measurement of the rod-shaped object based on image processing

Elastic modulus measurement of the rod-shaped object based on image processing

Experimental investigation on the nanoindentation viscoelastic constitutive model of quartz and kaolinite in mudstone

Experimental investigation on the nanoindentation viscoelastic constitutive model of quartz and kaolinite in mudstone

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