Observation of fracture process zone by laser speckle technique and governing mechanism in fracture of concrete

Horii, Hideyuki; Ichinomiya, Toshimichi

doi:10.1007/978-94-011-3638-9_2

Cited by 9 publications

(3 citation statements)

References 3 publications

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“…Many experimental techniques have been used for investigating FPZ in concretes, which include direct and indirect approaches. The direct approaches involve the scanning electron microscopy (SEM) [ 8 , 9 ], the X-ray diffraction method [ 10 , 11 , 12 ], the laser-speckle interferometry [ 13 , 14 ], photo-elastic coating method [ 15 ], moire interferometry [ 16 ], acoustic emission (AE) [ 17 , 18 ], and digital image correlation (DIC) [ 3 , 4 , 7 ]. For the indirect approach, characteristics of the FPZ are found through the parametric fitting of experimental results, such as load-deflection or load-crack mouth opening displacement, without directly identifying the local fracture processes in the specimen [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Mixed-Mode I-II Fracture Process Zone Characteristic of the Four-Point Shearing Concrete Beam

Ren

2020

Materials

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The size of the fracture process zone (FPZ) has significance for studying the fracture mechanism and fracture characteristics of concrete. This paper presents the method of assessing the FPZ of Mixed-Mode I-II for quasi-static four-point shearing concrete beams with pre-notched by Lagrangian strain profiles from digital image correlation (DIC). Additionally, it explores the influences of volume rates of the coarse aggregate of 0%, 28%, 48%, and 68%, and the specific surface areas of 0.12 m2/kg, 0.15 m2/kg, and 0.26 m2/kg on the size of the FPZ. It shows that the size of FPZ in four-point shearing concrete beam can be characterized by the displacement field and strain field using DIC. The size of FPZ conforms to linear positive correlation with the volume rate of coarse aggregate, and linear negative correlation with the specific surface area of coarse aggregate. It presents that the crack initiation of the four-point shearing beam with the pre notch is dominated by mode I load, and the propagation and fracture of Mixed-Mode I-II cracks are caused by the combined effect of Mode I and Mode II loading.

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Section: Introductionmentioning

confidence: 99%

Mixed-Mode I-II Fracture Process Zone Characteristic of the Four-Point Shearing Concrete Beam

Ren

2020

Materials

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“…Many efforts have been made in recent decades to characterise the FPZ in concrete in terms of the extent of the FPZ [2][3][4][5][6], the formation and propagation of the FPZ [7][8][9], size effect of the FPZ [3,10] and other properties of the FPZ [11][12][13][14][15]. Despite countless research efforts on the FPZ, there are still numerous uncertainties, such as the energyconsuming mechanism of the FPZ and the crack advance length, which prevent the establishment of effective fracture mechanics parameters for concrete [16].…”

Section: Introductionmentioning

confidence: 99%

Tension softening curves of plain concrete

Chen

2013

Construction and Building Materials

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The tension softening curves (TSCs) of plain concrete with compressive strengths varying between 40 and 90 MPa were estimated by performing three-point bending tests on pre-notched beams. Crack evolution and full-field deformation in the beams were measured using the electronic speckle pattern interferometry technique. The crack characteristics, including the crack opening displacement profiles, the width of the fracture process zone and the length of the crack, were evaluated. By using a newly developed incremental displacement collocation method, the TSCs of plain concrete were determined. To facilitate the use of TSCs by commercial finite element packages, the estimated TSCs were simplified to bilinear and exponential curves, and the related parameters were determined.

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“…In concrete-like materials, it is generally accepted that macrocracks stem from the interaction and the progressive coalescence of diffused micro-cracks within the so-called fracture process zone [1][2][3][4][5][6][7][8][9]. Despite the fact that the cracking process is continuous, its different stages have been faced in the finite element literature by adopting antagonistic standpoints.…”

Section: Introductionmentioning

confidence: 99%

Simulation of finite-width process zone in concrete-like materials by means of a regularized extended finite element model

Benvenuti

Tralli

2012

Comput Mech

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Experimental tests carried out on concrete specimens show that a fracture process zone with finite width develops in front of the crack tip. Currently, the only way of modelling a finite-width process zone is to adopt a non-local continuum damage model. This choice, however, precludes the description of macro-cracks, which emerge during the late stage of the cracking process. The eXtended Finite Element Method is a powerful tool for modelling the cracking process. The proposed eXtended Finite Element approach can simulate in a unified and smooth way both the formation of a process zone with finite width and its subsequent collapse into a macro-crack. Weak points of existing formulations, such as the necessity of ad hoc strategies in order to get mesh-independent results, and the sudden loss of stiffness at the transition from the continuous to the discontinuous regime, are overcome. In the case of tensile cracking, effectiveness is tested through comparisons with numerical and experimental results

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Observation of fracture process zone by laser speckle technique and governing mechanism in fracture of concrete

Cited by 9 publications

References 3 publications

Mixed-Mode I-II Fracture Process Zone Characteristic of the Four-Point Shearing Concrete Beam

Mixed-Mode I-II Fracture Process Zone Characteristic of the Four-Point Shearing Concrete Beam

Tension softening curves of plain concrete

Simulation of finite-width process zone in concrete-like materials by means of a regularized extended finite element model

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