Application of nanoindentation technology in rocks: a review

Ma, Zhaoyang; Ranjith, P.G.; Zhang, Chengpeng

doi:10.1007/s40948-020-00178-6

Cited by 63 publications

(13 citation statements)

References 229 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mechanical parameters such as elastic modulus and Poisson's ratio of matrix and minal are determined based on the relationship between hardness value and material mechanical parameters, and the results are shown in Table 6. Although the method employed to determine the mechanical parameters has a disadvantage, it could meet the accuracy requirements of mechanical calculation and numerical simulation [55][56][57][58]. In the simulation, fixed constraints are applied to the nodes 20 mm away from the center of the circle at the bottom of the model, and a concentrated load is applied to the upper part of the model.…”

Section: Numerical Simulation Analysis Of the Samplesmentioning

confidence: 99%

Investigation on Pore-Fracture of Coal and Its Influence Mechanism on Tensile Failure Behavior of Coals with Bursting Proneness

Guo

Liu

et al. 2021

Geofluids

View full text Add to dashboard Cite

Both computed tomography (CT) and notched semicircular bend (NSCB) tests are performed for coals with high and medium bursting proneness to extract the scientific expression of pore-fracture and its influence mechanism on the tensile failure behavior. The acoustic emission (AE) parameters in the sample during loading and failure are monitored, and the influence mechanism of pore-fracture on tensile failure behavior of coal is analyzed. The result illustrates that the spatial distribution feature of the pore-fracture in coals with high and medium bursting proneness is extremely different. The deformation and failure mode of the coals are affected by many factors, loading mode, notch depth and width, mechanical properties of matrix and minal, spatial distribution feature of pore-fracture, etc. The influence of primary pore-fracture in the coal on the extension and penetration of the secondary fracture could be divided into two types: bifurcation and promotion, which would cause different local damage in the sample and affect the final failure mode. The feature of acoustic emission parameters indicates that the deformation and failure process of a sample under loading could be divided into four stages: compaction stage, elastic deformation stage, displacement plastic growth stage, and post peak failure stage, which is the result of comprehensive action of many factors. The evolution process of secondary fracture is accompanied by the dissipation of elastic strain energy and the intensification of internal damage of coal, which reflects the failure process of coal.

show abstract

Section: Numerical Simulation Analysis Of the Samplesmentioning

confidence: 99%

Investigation on Pore-Fracture of Coal and Its Influence Mechanism on Tensile Failure Behavior of Coals with Bursting Proneness

Guo

Liu

et al. 2021

Geofluids

View full text Add to dashboard Cite

show abstract

“…Nanoindentation has become an increasingly popular technique for determining the properties of various materials (metals, composites, polymers, coatings, films, etc.) (Ma et al, 2020;Rominiyi and Mashinini, 2023). The technique has been used for extracting residual stress field (Zhou et al, 2015), investigating the phase transformation process (Wang et al, 2017), and examining the hardness and Young's modulus (Jin et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Why do cracks occur in the weld joint of Ti-22Al-25Nb alloy during post-weld heat treatment?

Shao

Zhang²,

Chen³

et al. 2023

Front. Mater.

View full text Add to dashboard Cite

Ultrasonic pulse frequency tungsten inert gas welding technology was adopted to join Ti-22Al-25Nb alloy. There were some cracks in the Ti-22Al-25Nb alloy weld joint after post-weld heat treatment. The hardness and Young’s modulus of α2, O, and β/B2 phases in Ti-22Al-25Nb alloy were examined with an in situ nanoindentation technique. The phase transition stresses of three different phases in the weld joint of Ti-22Al-25Nb alloy were analyzed to explain why cracks occur in the weld joint of Ti-22Al-25Nb alloy during post-weld heat treatment. The results show that mean hardness is highest for the α2 phase, second-highest for the O phase, and lowest for the β/B2 phase; the mean Young’s modulus has the same trend in Ti-22Al-25Nb alloy. Phase transition stress results in cracks in the weld joint of Ti-22Al-25Nb alloy during post-weld heat treatment. By improving post-weld heat treatment, the ultimate strength of the Ti-22Al-25Nb alloy weld joints reaches 750 MPa, which is 72.5% that of the base material.

show abstract

“…The higher the ratio, the more brittle the rock [ 7 , 8 , 9 , 10 ]. The second is based on the stress–strain curve of the rock [ 11 , 12 , 13 , 14 ]. The third method uses elastic parameters such as elastic modulus and Poisson’s ratio to evaluate rock brittleness.…”

Section: Introductionmentioning

confidence: 99%

The Characteristic and Distribution of Shale Micro-Brittleness Based on Nanoindentation

et al. 2022

View full text Add to dashboard Cite

Shale is a special kind of rock mass and it is particularly important to evaluate its brittleness for the extraction of gas and oil from nanoporous shale. The current brittleness studies are mostly macro-evaluation methods, and there is a lack of a micro-brittleness index that is based on nanoindentation tests. In this paper, nanoindentation tests are carried out on the surface of shale to obtain mechanical property, and then a novel micro-brittleness index is proposed. Drawing a heat map by meshing indentation, the distribution characteristics of the brittleness index for the surface of shale and the variation laws between the mineral and brittleness index are explored. The results showed that the dimensionless brittleness index involved parameters including indentation irreversible deformation, elastic modulus, hardness and fracture toughness. The micro-brittleness index of the shale ranged from 7.46 to 65.69, and the average brittleness index was 25.837. The brittleness index exhibited an obvious bimodal distribution and there was great heterogeneity on the surface of shale. The crack propagation channels were formed by connecting many indentation points on the shale surface with high brittleness. The total brittleness index of quartz minerals was high, but the cementation effect with different minerals was various. Although the general brittleness of clay was low, the high brittleness index phenomenon was also exhibited. Studying the micro-brittleness of shale provides a more detailed evaluation for the shale friability, which is used to determine the optimal shale oil and gas recovery regime.

show abstract

Application of nanoindentation technology in rocks: a review

Cited by 63 publications

References 229 publications

Investigation on Pore-Fracture of Coal and Its Influence Mechanism on Tensile Failure Behavior of Coals with Bursting Proneness

Investigation on Pore-Fracture of Coal and Its Influence Mechanism on Tensile Failure Behavior of Coals with Bursting Proneness

Why do cracks occur in the weld joint of Ti-22Al-25Nb alloy during post-weld heat treatment?

The Characteristic and Distribution of Shale Micro-Brittleness Based on Nanoindentation

Contact Info

Product

Resources

About