Rupture energy evaluation for brittle materials

Gaziev, É. G.

doi:10.1016/s0020-7683(01)00037-3

Cited by 31 publications

(13 citation statements)

References 3 publications

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“…To reveal the influence of confining pressure on rock energy evolution, the triaxial cyclic loading-unloading experiments on red sandstone specimens under six groups of confining pressures (5,10,15,20,25, and 30 MPa) were carried out. The experimental scheme was detailed in Table 1.…”

Section: Experimental Equipment and Methodsmentioning

confidence: 99%

“…For example, Tsoutrelis and Exadaktylos analyzed the energy characteristics of rock before the peak based on uniaxial and triaxial rock compression experiments in the lab [9]. Gaziev proposed that the failure of the unit cell does not begin until the shape change reaches a limiting value and that continuous accumulation of total strain energy is a necessary condition for material failure [10]. Holcomb noted that the stress-strain curve of rock was characterized by nonlinearity, hysteresis, discrete memory, and energy dissipation under uniaxial cyclic loading [11].…”

Section: Introductionmentioning

confidence: 99%

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Energy Evolution Characteristics and Distribution Laws of Rock Materials under Triaxial Cyclic Loading and Unloading Compression

Zhang

Meng

Liu

2017

Advances in Materials Science and Engineering

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To explore the influence of confining pressure on the energy evolution characteristics of loaded rocks, triaxial cyclic loadingunloading experiments on sandstones were carried out under 6 kinds of confining pressures using the axial loading and circumferential deforming control modes. Total energy density, elastic energy density, and dissipated energy density absorbed by rock specimens under different confining pressures were obtained. The confining pressure effect of the evolution process and distribution law in energy accumulation and dissipation was analyzed. Energy conversion mechanism from rock deformation to failure was revealed, and energy conversion equations in different stress-strain stages were established. The method of representing the rock energy accumulation, dissipation, and release behaviors by energy storage limit density, maximum dissipated energy density, and residual elastic energy density was established. The rock showed that, with the increase of confining pressure, the characteristic energy density of rock increased in the power exponent form, and the energy storage limit density increased faster than the maximum dissipated energy density. The greater the confining pressure was, the greater the proportion of elastic energy before peak was. It is indicated that the confining pressure increased the energy inputting intensity, improved the energy accumulating efficiency, and inhibited the energy releasing degree.

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Section: Experimental Equipment and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy Evolution Characteristics and Distribution Laws of Rock Materials under Triaxial Cyclic Loading and Unloading Compression

Zhang

Meng

Liu

2017

Advances in Materials Science and Engineering

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“…e crack initiation stress of rock is one of the important grounds for judging whether the rock is subject to fracture or not. Crack initiation stress means that the stress applied on the specimen when the macrocrack begins to form, and Gaziev and Levtchouk [21,22] and Huang et al [23] examined the relationship between crack initiation stress and rock damage energy and the relationship between crack initiation stress and loading rate. e crack initiation stress obtained by calculation [17][18][19][20][21] is given in Table 9.…”

Section: Crack Initiation Angle and Initiation Stressmentioning

confidence: 99%

Dynamic Fracture Experiment of Fractured Rock under Dynamic Loading

Wang

Zhou

et al. 2020

Shock and Vibration

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In order to examine the dynamic mechanical properties, dynamic crack proposition process, and energy loss of fractured rock under dynamic loading, the specimens with different fracture dig angles were processed with Φ50 mm × 50 mm cylindrical sandstone, the impact loading test was conducted on 50 mm stem diameter split Hopkinson pressure bar (SHPB) experiment platform, and the whole process of crack propagation and dynamic failure was recorded using a high-speed camera. As a result, the dynamic mechanical properties such as stress wave fluctuation characteristics, peak strength and stress-strain relationship, crack initiation angle, stress and other dependencies with prefabricated fracture angle of the prefabricated fracture specimens under high strain rate were obtained, and the incident energy, absorbed energy, and energy absorption rates were compared to investigate the energy loss law in the dynamic loading; on the contrary, the effects of different loading rates on the dynamic mechanical properties of the sandstone specimens were identified, and finally a set of findings were presented.

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“…The rock three-point bending tests conducted by Zhou et al [15] showed that the strain energy density would show a nonlinear increase with the increase of loading rate. Gaziev [16] believed that the fracture energy caused by the failure of rock in brittle materials was closely related to stress state. Xie et al [17] believed that the essence of rock failure is the damage caused by energy dissipation.…”

Section: Introductionmentioning

confidence: 99%

Energy dissipation mechanism and damage model of marble failure under two stress paths

Zhang¹,

Ren²,

Ma³

et al. 2014

Frattura Ed Integrità Strutturale

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ABSTRACT. Marble conventional triaxial loading and unloading failure testing research is carried out to analyze the elastic strain energy and dissipated strain energy evolutionary characteristics of the marble deformation process. The study results show that the change rates of dissipated strain energy are essentially the same in compaction and elastic stages, while the change rate of dissipated strain energy in the plastic segment shows a linear increase, so that the maximum sharp point of the change rate of dissipated strain energy is the failure point. The change rate of dissipated strain energy will increase during unloading confining pressure, and a small sharp point of change rate of dissipated strain energy also appears at the unloading point. The damage variable is defined to analyze the change law of failure variable over strain. In the loading test, the damage variable growth rate is first rapid then slow as a gradual process, while in the unloading test, a sudden increase appears in the damage variable before reaching the rock peak strength. According to the deterioration law of damage and the impact of confining pressure on the elastic modulus, a rock damage constitutive model is established, which has a better fitting effect on the data in the loading and unloading failure processes.

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Rupture energy evaluation for brittle materials

Cited by 31 publications

References 3 publications

Energy Evolution Characteristics and Distribution Laws of Rock Materials under Triaxial Cyclic Loading and Unloading Compression

Energy Evolution Characteristics and Distribution Laws of Rock Materials under Triaxial Cyclic Loading and Unloading Compression

Dynamic Fracture Experiment of Fractured Rock under Dynamic Loading

Energy dissipation mechanism and damage model of marble failure under two stress paths

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