Fracture load prediction under mixed mode I + II using a stress based method for brittle materials tested with the asymmetric four-point bend specimen

Aliha, M.R.M.; Mousavi, Sepehr; Ghoreishi, Seyed Mohammad Navid

doi:10.1016/j.tafmec.2019.102249

Cited by 54 publications

(14 citation statements)

References 60 publications

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“…For mixed-mode I/II crack, abundant achievements under static loading conditions have been made by researchers [14][15][16][17][18]. Several classic specimen configurations have been proposed to study the crack propagation behavior and fracture growth in brittle materials, such as the single edge notched three-point-bend (SENB) [19], the asymmetric four-point-bend (AFPB) [20], the Brazilian disk (BD) [21], and the semi-circular bends (SCB) [22], as shown in Figure 1. Those specimen configurations were widely applied in the vast fracture toughness measuring and behavior detecting.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Mixed-Mode I/II Fracture under Impact Loading Using Split-Hopkinson Pressure Bar

et al. 2020

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Mixed-mode fracture of construction building materials under impact loading is quite common in civil engineering. The investigation of mixed-mode crack propagation behavior is an essential work for fundamental research and engineering application. A variable angle single cleavage semi-circle (VASCSC) specimen was proposed with which the dynamic fracture test was conducted by using a Split-Hopkinson pressure bar (SHPB). Notably, the mixed-mode crack propagation velocity could be detected by the synchronized crack velocity measuring system. With experimental results, the dynamic initiation stress intensity factors KI and KII were calculated by the experimental-numerical method. Additionally, the crack path of mixed-mode I/II fracture can be predicated precisely by using numerical method. Thus, a comprehensive approach of investigation on mixed-mode I/II fracture under impact loading was illustrated in this paper. The study demonstrates that the mixed-mode I/II crack would transform from complicated mode I/II to pure mode I during crack propagation, and several velocity decelerations induced crack deflection. The dynamic initiation fracture toughness of mixed-mode crack was determined by the experimental-numerical method. The VASCSC specimen has a great potential in investigating mixed-mode fracture problems with the SHPB device.

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Section: Introductionmentioning

confidence: 99%

Investigation of Mixed-Mode I/II Fracture under Impact Loading Using Split-Hopkinson Pressure Bar

et al. 2020

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“…For a long time, the problem of rock fracture mechanism has attracted much attention. Many scholars have carried out a series of experiments on various rocks, such as Aliha et al 27 – 29 uses a new type of cracked disc specimen to experimentally study the I/III mixed fracture toughness of a typical rock material under bending load. It was shown that the specimen can provide full combinations of modes I and III and consequently a complete set of mixed mode I/III fracture toughness data were determined for the tested marble rock.…”

Section: Discussion On Fracture Mechanismmentioning

confidence: 99%

Research on crack evolution law and macroscopic failure mode of joint Phyllite under uniaxial compression

Fei

et al. 2021

Sci Rep

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In order to explore the fracture mechanism of jointed Phyllite, the TAJW-2000 rock mechanics test system is used to carry out uniaxial compression tests on different joint inclination Phyllites. The influence of joint inclination of Phyllite failure mode is discussed, and the progressive failure process of Phyllite is studied. The test results show that the uniaxial compressive strength anisotropy of jointed Phyllite is remarkable. As the inclination increases, it exhibits a U-shaped change; When 30° ≤ α ≤ 75°, the tensile and shear failures along the joint inclination mainly occurs. the joint inclination controls the failure surface form of the Phyllite; The crack initial stress level of the joint Phyllite is 0.30–0.59σf, the crack failure stress level is 0.44–0.86σf. When α = 90°, the σcd value is the largest, and σcd with α = 90° can be used as the maximum reliable value of uniaxial compressive strength of Phyllite. Using the theory of fracture mechanics, it is analyzed that under uniaxial compression of the rock, the crack does not break along the original crack direction, but extends along the direction at a certain angle to the original crack. The joint effect coefficient is proposed to show the influence of the joint inclination on the uniaxial compressive strength of the phyllite. Both the test and simulation results show that when the joint inclination is 60°, the joint effect coefficient is the largest. The compressive strength is the smallest. Numerical simulation analyses the crack evolution law of phyllite under different joint inclination under uniaxial compression, which verifies that there are different failure modes of joint phyllite under uniaxial compression.

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“…Moreover, some fracture criteria can be found in the literature to describe the size‐dependent fracture behavior of rock specimens subjected to mode I, mode II, and mixed mode I/II loading. 30,32,41,44–46…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, some fracture criteria can be found in the literature to describe the size-dependent fracture behavior of rock specimens subjected to mode I, mode II, and mixed mode I/II loading. 30,32,41,[44][45][46] Almost all of the aforementioned criteria is written according to the coefficients of stress or strain terms proposed by Williams 14 such as stress intensity factors K I and K II , T-stress and coefficients A 3 and B 3 . Hence, these coefficients should be first determined.…”

Section: Introductionmentioning

confidence: 99%

A stress-based approach for considering the size effect on the mixed mode fracture behavior of rock

Aslani

Akbardoost

Berto

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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It is aimed in this research that a new approach is represented for justifying the influence of specimen size on the mixed mode I/II fracture behavior of rock. The new approach, namely, the MTS-FEM criterion, is an extension of the maximum tangential stress (MTS) criterion in which the finite element method (FEM) is employed for characterizing the tangential stress at the critical distance. Also, two points exist in the MTS-FEM approach for the critical distance. First one is that the critical distance is obtained directly from finite element analysis corresponding to results of mode I fracture test. The second point is that the critical distance from the crack tip is considered as a function of specimen size. The experimental results carried out in the previous studies on cracked Brazilian disks (CBD) with four different radii and under mixed mode loading are utilized with the aim to evaluate the new size effect criterion. It is illustrated that the MTS-FEM criterion is able to predict the mixed mode fracture resistance of rock considering the size effect well without calculating any parameters related to the stress or strain series expansion.

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Fracture load prediction under mixed mode I + II using a stress based method for brittle materials tested with the asymmetric four-point bend specimen

Cited by 54 publications

References 60 publications

Investigation of Mixed-Mode I/II Fracture under Impact Loading Using Split-Hopkinson Pressure Bar

Investigation of Mixed-Mode I/II Fracture under Impact Loading Using Split-Hopkinson Pressure Bar

Research on crack evolution law and macroscopic failure mode of joint Phyllite under uniaxial compression

A stress-based approach for considering the size effect on the mixed mode fracture behavior of rock

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Fracture load prediction under mixed mode I + II using a stress based method for brittle materials tested with the asymmetric four-point bend specimen

Cited by 54 publications

References 60 publications

Investigation of Mixed-Mode I/II Fracture under Impact Loading Using Split-Hopkinson Pressure Bar

Investigation of Mixed-Mode I/II Fracture under Impact Loading Using Split-Hopkinson Pressure Bar

Research on crack evolution law and macroscopic failure mode of joint Phyllite under uniaxial compression

A stress-based approach for considering the size effect on the mixed mode fracture behavior of rock

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Fracture load prediction under mixed mode I + II using a stress based method for brittle materials tested with the asymmetric four-point bend specimen