Four-point bending tests for the fracture properties of concrete

Yin, Yangyang; Yu, Qiao; Hu, Shaowei

doi:10.1016/j.engfracmech.2019.03.004

Cited by 66 publications

(17 citation statements)

References 67 publications

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“…Khalilpour et al [10] further compared the number of available methods of determination of fracture parameters and reviews the factors affecting these parameters. Yin et al [11] presents Four-point bending tests for the fracture properties of concrete. Murthy et al [12] studied the fracture energy and tension softening relation for nano-modified concrete.…”

Section: Introductionmentioning

confidence: 99%

Fracture behavior of plain and fiber-reinforced high strength concrete containing high strength steel fiber

Ojha¹,

Singh²,

Singh³

et al. 2022

Res. Eng. Struct. Mater.

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With the increase in strength, concrete explodes spontaneously at failure creating a serious safety hazard. Researchers are actively looking for methods to arrest the cracks in concrete and design a higher strength concrete that fails in a more ductile fashion. Fiber-reinforced concrete has emerged as one of the solutions to this problem. This paper presents findings from the experimental investigation conducted to compare the fracture behavior of plain and fiberreinforced high strength concrete of varying compressive strength. Six different concrete mixes were prepared with w/b ratios of 0.47, 0.36, and 0.20 resulting in average compressive strength of 36, 52, and 92 MPa. Each mix consists of two variations, first without fiber and second with 1% of steel fiber by volume. The mixes were tested for their strength and fracture Behavior using various standard codes and recommendations. From the Load-deflection and Load-CMOD (Crack Mouth Opening Displacement) curves obtained from the study, Fracture parameters like Fracture energy, Stress intensity factor, energy release rate, and Characteristic length is evaluated and compared for plain and Steel fiber reinforced concrete. It was found that adding steel fiber significantly improves the fracture properties of the concrete of different compressive strengths. By adding 1% of steel fiber in the high-strength concrete, the average fracture energy increased by 850%, 770%, and 450% respectively for the concrete with compressive strength of 36, 52, and 92 MPa. Other parameters also show a very significant improvement suggesting fiber reinforcement as a suitable choice to prevent brittle failure and increase the fracture performance of high strength concrete.

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Section: Introductionmentioning

confidence: 99%

Fracture behavior of plain and fiber-reinforced high strength concrete containing high strength steel fiber

Ojha¹,

Singh²,

Singh³

et al. 2022

Res. Eng. Struct. Mater.

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“…In the case of circumferential cracking, we assume the material is a flat plate subjected to a bending moment (Figure 14B,C). Here, the fracture energy release can be described by: 63,64 where a is the crack length, P is the applied load, M is the bending moment, and I is the moment of inertia.…”

Section: Methodsmentioning

confidence: 99%

“…In the other case of through-thickness cracking, we assume the strain/stress field is relative uniform through the thickness (Figure 14D). Here, the fracture energy release can be described by: 64 where is the local tensile stress.…”

Section: Methodsmentioning

confidence: 99%

Characterizing environment‐dependent fracture mechanisms of ceramic matrix composites via digital image correlation

et al. 2021

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Here, we unveil a methodology for a novel assessment of the fracture mechanics of SiC/SiC ceramic matrix composites enabled by in situ stereoscopic digital image correlation to quantify in-process flexural strain and crack opening displacement measurements. This technique isolates individual cracks on the composite surface as discontinuities in the spatial displacement field and correlates key fracture characteristics with the flexural strain of composite specimens during coupled four-point bend / hermeticity testing. Fracture was observed along the specimen length, originating at the tensile underside and propagating around the circumference of the tubular specimens with generally uniform spacing. Multiple specimens were also tested after heat treatments to 1200°C in open air, in vacuum, and in helium for 48 h to evaluate the environmental effects on the fracture mechanisms of SiC/SiC composites, which revealed degradation of flexural properties after treatment in open air resulting in brittle failure. Indentation-based fracture toughness measurements were performed, which confirmed a 25% reduction in toughness after open air heat treatment relative to the other heat treatments. This assessment indicated that significant oxidation may occur within the composites from these heat treatments and suggested that further protection of the composites may be necessary for high-temperature applications.

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“…[25] carried out ASTM D7012-04 standard FPB test research on concrete block material with notch using FEM software ABAQUS and LS-DYNA to determine and investigate material strength in the middle area of the cross-section of the specimen, by using dynamic-explicit approach, while in this research the simulation approach is quasi-static. Figure 3 above describes the geometry of concrete block FPB testing with notch, including W (W=B), or the cross-section width of the specimen, the width of the notch (N), the angle (θ < 90°) (ASTM E399), the length of the initial notch crack (a 0 H ⁄ = 0.2), and H, which denotes the height of the specimen's cross-section [7].…”

Section: Fpb Testing With Notchmentioning

confidence: 99%

“…Studies on concrete bending tests have been conducted through numerous field experiments. Referring to prior research [7], Yin et al experimented with a concrete block FPB test according to ASTM E399 standards [8] with varied initial notch crack ratios (0.2 -0.6) on five concrete specimens. The material properties of the concrete included 2400 kg/m³ density and an elastic modulus of 32.46 GPa.…”

Section: Introductionmentioning

confidence: 99%

Stress and Deflection of a Concrete Block in a Four-Point Bending (FPB) Test

Siswanto¹,

Martama²

2019

ujme

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This study aims to identify the stress concentration and distribution pattern in the mid-cross-section of a concrete block in a four-point bending (FPB) test with notch and without notch using a finite element method (FEM). The research was preceded by a meshing sensitivity analysis (MSA) with verification of reference from FPB test deflection theories. The selected finite element model was then used for numerical FPB testing with load variants of 100 kN, 200 kN and 300 kN. Simulation test results show that the greatest stress and deflection of the model from the FPB simulation with notch occur in the mid-bottom area, while in the model without notch the strongest stress takes place in the mid-bottom area and the largest deflection in the mid-center area. The influence of load variation indicates that the greater the load, the greater the stress concentration and deflection around the notch. Simulation by FEM can replace real material tests by means of the finite element model applied in this study.

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Four-point bending tests for the fracture properties of concrete

Cited by 66 publications

References 67 publications

Fracture behavior of plain and fiber-reinforced high strength concrete containing high strength steel fiber

Fracture behavior of plain and fiber-reinforced high strength concrete containing high strength steel fiber

Characterizing environment‐dependent fracture mechanisms of ceramic matrix composites via digital image correlation

Stress and Deflection of a Concrete Block in a Four-Point Bending (FPB) Test

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