A novel methodology for characterizing fracture process zone evolution in Barre granite specimens under mode I loading

Garg, Prasoon; Zafar, Sana; Hedayat, Ahmadreza; Moradian, Omid; Griffiths, D. V.

doi:10.1016/j.tafmec.2022.103727

Cited by 15 publications

(4 citation statements)

References 64 publications

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Section: Nonlocal Deformation Zone Observation Resultsmentioning

confidence: 63%

“…As shown in Figure 2 d, the local deformation zone was quite extended, and the strain levels in the local deformation zone reached about 0.01, being 15 times that outside of the local deformation zone, at 0.0008. These phenomena indicate that the complicated interaction interferes with the mesoperspective of the local deformation zone, which can also be regarded as the fracture process zone [ 45 , 46 ]. After the loading displacement reached a threshold, the macrocrack can be observed clearly in Figure 2 e (CMOD = 0.00044 m), whereas the length of the local deformation zone changed little compared with the previous result, shown in Figure 2 d. It can be summarized that the length of the nonlocal deformation zone extends to the limiting value to result in the instability of the fracture, and the limited length of the nonlocal deformation zone may also be regarded as an index for the indication of the instability failure of the concrete structure.…”

Section: Resultsmentioning

confidence: 99%

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Experimental and Simulation Study of the Fracture Instability Behavior in Polypropylene Fiber-Reinforced Concrete

Cao

Shi

et al. 2023

Materials

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This study investigated the fracture characteristics of plain concrete and polypropylene fiber-reinforced concrete (PFRC) using pre-notched three-point bending beam tests with the digital speckle correlation method (DSCM). Then, the fracture instability behavior of the two types of beams was simulated in finite elements based on the plastic damage model and the cohesion model, for which the applicability was assessed. Furthermore, the stability of the Big Gang Mountain Dam made from plain concrete or PFRC subjected to the earth-quake loading was simulated with the plastic damage model. The results show that the limiting length of the non-local deformation zone can be used as an indicator of instability damage in a concrete structure. The simulation results of the plastic damage model agreed well with the local deformation in the pre-notched three-point bending beam test obtained from the DSCM. The plastic damage model was found to be capable of describing the residual strength phenomenon, which the cohesive model was not capable of. The damage evolution regions of the PFRC dam are strictly constrained in some regions without the occurrence of the local deformation band across the dam, and PFRC can dramatically reduce the failure risk under earthquake loading. The numerical solution proves that PFRC is an advisable material for avoiding failure in concrete dams.

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Section: Nonlocal Deformation Zone Observation Resultsmentioning

confidence: 63%

Section: Resultsmentioning

confidence: 99%

Experimental and Simulation Study of the Fracture Instability Behavior in Polypropylene Fiber-Reinforced Concrete

Cao

Shi

et al. 2023

Materials

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“…However, the trade-offs between the subset size, shape function, and spatial resolution mean that the traditional subsetbased DIC algorithm cannot measure the strongly heterogeneous deformation field of rock deformation localization with sufficient accuracy [37][38][39][40]. In addition, the AE technique has been combined with DIC in rock mechanics experiments [41][42][43][44][45][46][47], but previous studies did not present a detailed analysis on the relationship between the deformation field evolution characteristics and the AE parameters.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Rock Deformation Localization Using Digital Image Correlation and Acoustic Emission

Xing,

Zhu,

Song

2024

Applied Sciences

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In this study, the digital image correlation (DIC) method and acoustic emission (AE) technology were combined to study the evolution of rock deformation localization in detail. The second-order spatial–temporal subset DIC (STS-DIC) algorithm was proposed and used for measuring strongly heterogeneous deformation fields of red sandstone specimens under uniaxial compression. The evolution of the deformation field was analyzed with a focus on the deformation localization stage. The length and width of the deformation localization band (DLB) were measured, and the relationships between the relative sliding rate of the DLB, the relative opening rate of the DLB, and the AE counts were identified. Deformation localization was found to result from the rapid evolution of the strain concentration before the peak stress. The complete development of the DLB is an inducing factor for catastrophic rock failure, and the failure modes of the rock specimens were consistent with the final state of the DLB. A good correlation was identified between the AE counts and the relative displacement rate of the DLB, and the sliding rate was found to have a significant influence on the AE counts.

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“…Additionally, significant attention has been given to studying acoustic emission in laboratory environments, particularly in utilizing this technique to understand the process and mechanism of rock brittle failure. Many scholars have made essential contributions in this area [27][28][29][30][31][32][33][34]. In this study, the impact of multiple heating and liquid nitrogen cooling on the mechanical properties of granite was examined through three-point bending tests.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mode I Fracture Characteristics of Granite after Low Temperature Cooling with Liquid Nitrogen

Wang,

Xue,

Cao

et al. 2023

Water

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Liquid nitrogen fracturing has emerged as a promising technique in fluid fracturing, providing significant advantages for the utilization and development of geothermal energy. Similarly to hydraulic fracturing in reservoirs, liquid nitrogen fracturing entails a common challenge of fluid–rock interaction, encompassing the permeation and diffusion processes of fluids within rock pores and fractures. Geomechanical analysis plays a crucial role in evaluating the transfer and diffusion capabilities of fluids within rocks, enabling the prediction of fracturing outcomes and fracture network development. This technique is particularly advantageous for facilitating heat exchange with hot dry rocks and inducing fractures within rock formations. The primary objective of this study is to examine the effects of liquid nitrogen fracturing on hot dry rocks, focusing specifically on granite specimens. The experimental design comprises two sets of granite samples to explore the impact of liquid nitrogen cooling cycles on the mode I fracture characteristics, acoustic emission features, and rock burst tendency of granite. By examining the mechanical properties, acoustic emission features, and rock burst tendencies under different cycling conditions, the effectiveness of liquid nitrogen fracturing technology is revealed. The results indicate that: (1) The ultimate load-bearing capacity of the samples gradually decreases with an increase in the number of cycling times. (2) The analysis of acoustic emission signals reveals a progressive increase in the cumulative energy of the samples with cycling times, indicating that cycling stimulates the release of stored energy within the samples. (3) After undergoing various cycling treatments, the granite surface becomes rougher, exhibiting increased porosity and notable mineral particle detachment. These results suggest that the cyclic application of high-temperature heating and liquid nitrogen cooling promotes the formation of internal fractures in granite. This phenomenon is believed to be influenced by the inherent heterogeneity and expansion–contraction of internal particles. Furthermore, a detailed analysis of the morphological sections provides insights into the structural changes induced by liquid nitrogen fracturing in granite samples.

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A novel methodology for characterizing fracture process zone evolution in Barre granite specimens under mode I loading

Cited by 15 publications

References 64 publications

Experimental and Simulation Study of the Fracture Instability Behavior in Polypropylene Fiber-Reinforced Concrete

Experimental and Simulation Study of the Fracture Instability Behavior in Polypropylene Fiber-Reinforced Concrete

Experimental Study on Rock Deformation Localization Using Digital Image Correlation and Acoustic Emission

Experimental Study on Mode I Fracture Characteristics of Granite after Low Temperature Cooling with Liquid Nitrogen

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