Quasi-static loading rate effects on fracture process zone development of mixed-mode (I-II) fractures in rock-like materials

Xing, Yuanyuan; Huang, Bingxiang; Ning, Erqiang; Zhao, Liang; Jin, Feng

doi:10.1016/j.engfracmech.2020.107365

Cited by 54 publications

(19 citation statements)

References 53 publications

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“…Mixed-mode (I-II) fracturing is a prominent mechanical behavior of HF deflecting propagation. In this section, we will propose a rate-dependent mixed-mode (I-II) fracturing model, with insights from the rate-dependent FPZ of mixed-mode (I-II) fracturing [28], delineating the experiment-measured tensile fracturing characteristic of the mixed-mode (I-II) fracture in rock-like materials.…”

Section: Model Bases Of the Injection Rate-dependent Hf Deflecting Propagationmentioning

confidence: 99%

“…As shown in Figures 2 and 3, FPZ length is remarkably increased with the rising quasistatic loading rate. The completed development FPZ length (L) is regarded as the prominent rate-dependent parameter [28]. Therefore, distributions of cohesive stress and COD along the FPZ are rate-dependent (Equations ( 4)-( 6)), and the G f ðy 1 Þ in Equation (2) is also rate-dependent.…”

Section: Model Bases Of the Injection Rate-dependent Hf Deflecting Propagationmentioning

confidence: 99%

“…Given that the fluid injection of hydraulic fracturing is usually quasistatic, in our recently published work [28], the quasistatic rate-dependent FPZ development of mixed- 2 Geofluids mode (I-II) fracturing has been investigated. In detail, we conducted the mixed-mode (I-II) fracturing tests on the centrally cracked Brazilian disk (CCBD) specimens (radius: 50 mm) of artificial rock-like materials to create tensileshearing mixed-mode (I-II) fractures at different quasistatic displacement loading rates (0.02~2 mm/min).…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we proposed a rate-dependent mixed-mode (I-II) fracturing model, with insights from the ratedependent FPZ of mixed-mode (I-II) fracturing (our recently published work [28]). Based on the rate-dependent mixedmode (I-II) fracture model, we obtained several theoretical outcomes of the injection rate-dependent HF propagation rule, which was validated with the physical simulation tests of HF deflecting propagation.…”

Section: Introductionmentioning

confidence: 99%

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Injection Rate-Dependent Deflecting Propagation Rule of Hydraulic Fracture: Insights from the Rate-Dependent Fracture Process Zone of Mixed-Mode (I-II) Fracturing

Xing

Huang

2021

Geofluids

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Mixed-mode (I-II) fracturing is a prominent mechanical characteristic of hydraulic fracture (HF) deflecting propagation. At present, understanding the effect of injection rates on HF deflecting propagation remains challenging and restricts the control of HF deflecting propagation bearing tensile and shear stresses with fluid injection rates. Our recently published experimental results show that the fracture process zone (FPZ) length of mixed-mode (I-II) fractures in rock-like materials increases with the rising quasistatic loading rate. Both the deformation in FPZ and the generation of real fracture surfaces are tensile. On this basis, the rate-dependent mixed-mode (I-II) cohesive fracture model was proposed under quasistatic loading, and a couple of theoretical outcomes were obtained. Under different injection rates, the deflecting HF propagates step-by-step under mixed-mode (I-II) fracturing, and the HF extension path is supposed to be straight in each step. With the increment of injection rate, the increased (tensile) FPZ length is the stable propagation distance of deflecting HF in each step and besides deteriorates the fracture resistance discontinuity of FPZ developing to be a real tensile fracture. Thus, the mixed-mode (I-II) fracture tends to propagate unstably driven by kinetic energy once FPZ develops completely under fast loading. Moreover, two injection rate-dependent (IRD) HF deflecting propagation modes were determined, i.e., the step-by-step stable-propagation and step-by-step unstable propagation modes. HF deflection occurs in the step alternation of fracture propagation. With the increasing fluid injection rate, the increased FPZ length and kinetic energy (from fracture resistance discontinuity) extend the stable and unstable HF propagation distance along the initial direction in an extension step, respectively. Therefore, fast fluid injection improves the HF deflecting propagation radius; i.e., it inhibits the HF deflecting propagation or promotes HF extension along the initially designed direction. The injection rate-dependent HF deflecting propagation modes (based on the proposed model) were validated by further processing of published true triaxial physical simulation tests of hydraulic fracturing. The ordinal response of Fiber Bragg grating sensors embedded along the fracture propagation path, and the continuous fluctuant injecting pressures validate the step-by-step propagation of the hydraulic fracture. The test-measured deflecting HF trajectory indicates that high fluid injection rates remarkably increase the HF deflecting radius, which is consistent with the theoretical analysis in this work. The above findings can provide theoretical bases for controlling the HF deflecting propagation in the surrounding rock of mines and oil-gas reservoirs.

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Section: Model Bases Of the Injection Rate-dependent Hf Deflecting Propagationmentioning

confidence: 99%

Section: Model Bases Of the Injection Rate-dependent Hf Deflecting Propagationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Injection Rate-Dependent Deflecting Propagation Rule of Hydraulic Fracture: Insights from the Rate-Dependent Fracture Process Zone of Mixed-Mode (I-II) Fracturing

Xing

Huang

2021

Geofluids

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“…For a description of the crack propagation under mixed-mode I/II conditions, various test configurations were designed based on the literature search of test specimens used for testing the fracture parameters of rocks and cement-based composites. For this purpose, semi-circular disc specimens in three-point bending [7][8][9][10][11], centrally cracked Brazilian discs [10,12,13], and prismaticspecimens in asymmetric three- [14,15] or four-point [14,16] bending configurations are mostly used. Semi-circular discs were chosen for the present study.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Fracture and Fatigue Characteristics of Fine-Grained Composite Based on Sodium Hydroxide-Activated Slag Cured under High Relative Humidity

et al. 2020

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A typical example of an alternative binder to commonly used Portland cement is alkali-activated binders that have high potential as a part of a toolkit for sustainable construction materials. One group of these materials is alkali-activated slag. There is a lack of information about its long-term properties. In addition, its mechanical properties are characterized most often in terms of compressive strength; however, it is not sensitive enough to sufficiently cover the changes in microstructure such as microcracking, and thus, it poses a potential risk for practical utilization. Consequently, the present study deals with the determination of long-term mechanical fracture and fatigue parameters of the fine-grained composites based on this interesting binder. The mechanical fracture parameters are primarily obtained through the direct evaluation of fracture test data via the effective crack model, the work-of-fracture method, the double-K fracture model, and complemented by parameter identification using the inverse analysis. The outcome of cyclic/fatigue fracture tests is represented by a Wöhler curve. The results presented in this article represent the complex information about material behavior and valuable input parameters for material models used for numerical simulations of crack propagation in this quasi-brittle material.

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Size effect on fracture behavior of quasi-brittle materials during uniaxial compression tests

Wang

Huang

et al. 2023

Arch Appl Mech

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Quasi-static loading rate effects on fracture process zone development of mixed-mode (I-II) fractures in rock-like materials

Cited by 54 publications

References 53 publications

Injection Rate-Dependent Deflecting Propagation Rule of Hydraulic Fracture: Insights from the Rate-Dependent Fracture Process Zone of Mixed-Mode (I-II) Fracturing

Injection Rate-Dependent Deflecting Propagation Rule of Hydraulic Fracture: Insights from the Rate-Dependent Fracture Process Zone of Mixed-Mode (I-II) Fracturing

Mechanical Fracture and Fatigue Characteristics of Fine-Grained Composite Based on Sodium Hydroxide-Activated Slag Cured under High Relative Humidity

Size effect on fracture behavior of quasi-brittle materials during uniaxial compression tests

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