Two-parameter fracture mechanical analysis of a near-crack-tip stress field in wedge splitting test specimens

Seitl, Stanislav; Veselý, Václav; outil, Ladislav

doi:10.1016/j.compstruc.2011.05.020

Cited by 33 publications

(34 citation statements)

References 18 publications

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“…Fracture mechanical parameters of cementitious materials are usually obtained from recommended tests such as: three-point (3PBT) and four-point (4PBT) bending test with notch in tested specimen [4], for mixed mode load [5], wedge splitting test (WST) [6][7][8][9], or a combination of WST/3PBT [10] and modified compact tension test (MCT) [11,12]. All tests have a predefined prismatic geometry and using them on specimens made from the core-drill is expensive and not very efficient, therefore it is very appropriate to use a Brazilian disc test specimen with central notch (circle cut from the core-drill cylinder) [13][14][15][16] to determinate fracture parameters of building materials see Fig.…”

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confidence: 99%

Evaluation of mixed mode I/II fracture toughness of C 50/60 from Brazilian disc test

Seitl

Miarka

2017

Frattura Ed Integrità Strutturale

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ABSTRACT. Durability and sustainability of structures made from concrete like materials is getting more into an interest of civil engineers. Structures are subjected not only to uniaxial load, this means if there is a crack inside the load could be divided into mode I and shear mode II, but also to a mixed mode I/II. Therefore, it is necessary to perform test, which covers mixed mode loads and could be used for specimen made from concrete core-drill. Recommended test specimens used for evaluation of fracture mechanical parameters has usually a prismatic or rectangular shape. The cost of reshaping cylinder into rectangular is expensive and not very efficient, therefore it is very effective to use Brazilian disc test specimen with central notch to obtain mixed mode fracture parameters. The contribution deals with numerical support for Brazilian disc test to obtain calibration curves for mode I and mode II, evaluation of experimental results and compare them with data adapted from literature.

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Evaluation of mixed mode I/II fracture toughness of C 50/60 from Brazilian disc test

Seitl

Miarka

2017

Frattura Ed Integrità Strutturale

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“…The calibration curves are introduced in Eqs. (6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24) for each selected case. …”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…n this paper, the 2D and 3D models for numerical solution will be compared in a range of two-parameter fracture mechanics (see [11,20]). The finite element software ANSYS was used for numerical analysis [2].…”

Section: Numerical Solutionmentioning

confidence: 99%

“…Note that for test of fracture properties is not prepared norm only recommendation RILEM for three point bending test [17], RILEM for bending test for concrete with fibers [16,18] and as a standard test the wedge splitting test is used (cube or cylindrical [12,14,19,20]). The compact tension fracture toughness test (CT test [11,22]) is essentially performed by applying equal and opposite forces through two holes previously made in the specimen, to propagate an initial crack.…”

Section: Introductionmentioning

confidence: 99%

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Modified compact tension specimen for experiments on cement based materials: comparison of calibration curves from 2D and 3D numerical solutions

Seitl¹,

Viszlay²

2016

Frattura Ed Integrità Strutturale

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ABSTRACT. The evaluation of fracture mechanics parameters of materials has become very important part of considering the condition of older constructions as well as properties of newly developed materials. This contribution focuses on a numerical simulation and a calculation of fracture mechanical properties of modified compact tension test configuration. It is possible to prepare the specimens used for this test very easily from a drilled core or from specimens used for cylindrical compression test. The focus of contribution is to compare selected outputs from numerical solution of 2D (plane strain conditions) with 3D models. Particularly, the determination of the influence of 2D and 3D model on the calibration curves for selected fracture mechanics parameters is of interest. Finite element software ANSYS was used for the numerical analysis. KEYWORDS. Stress Intensity

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“…Reflection and diffraction occur for stress wave induced by detonation gas when it propagates to the original crack. The reflection occurs on the crack surface while the diffraction occurs at the original crack tip, intensifying the near-crack-tip stress field [42]. In Figure 4, the stress field at point A of distance r to crack tip O and of angle from direction OX is calculated by…”

Section: Analysis Of Blast Induced Crack Propagation In Rock Mass Conmentioning

confidence: 99%

Blast Induced Crack Propagation and Damage Accumulation in Rock Mass Containing Initial Damage

Wang

Zhao

et al. 2018

Shock and Vibration

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Blast induced rock mass damage and crack propagation play important roles in structure safety and stability in mining, quarrying, and civil constructions. This paper focuses on the effect of small blasthole diameter blast on crack propagation and damage accumulation in water-bearing rock mass containing initial damage composed of inherent geological discontinuities and previous multiblast induced damage. To elucidate this effect, theoretical analysis of calculation method for several important blast influencing factors is firstly presented. Secondly, definition of a practical damage variable using ratio of longitudinal wave velocity in rock mass before blast occurrence to that after blast occurrence and derivation of a damage accumulation calculation equation accounting for initial damage and blasting effect are described. Lastly, a detailed description of the conducted in situ blast tests and plan layout of the sonic wave monitoring holes is reported. The results indicate that blast activates and then extends the initial cracks in rock mass, leading to accumulation of rock mass damage. The rock mass damage accumulation can be conveniently quantified using the proposed damage variable. When the damage variable reaches its threshold of 0.19, occurrence of damage in the surrounding rock mass is indicated. It is also found that the blast induced rock mass damage extent and the blast induced vibration velocities decrease nonlinearly with increasing the distance between blast source and monitoring position.

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Two-parameter fracture mechanical analysis of a near-crack-tip stress field in wedge splitting test specimens

Cited by 33 publications

References 18 publications

Evaluation of mixed mode I/II fracture toughness of C 50/60 from Brazilian disc test

Evaluation of mixed mode I/II fracture toughness of C 50/60 from Brazilian disc test

Modified compact tension specimen for experiments on cement based materials: comparison of calibration curves from 2D and 3D numerical solutions

Blast Induced Crack Propagation and Damage Accumulation in Rock Mass Containing Initial Damage

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