Dynamic mixed-mode fracture in SCC reinforced with steel fibers: an experimental study

Ruiz, Gonzalo; Rosa, Ángel De La; Almeida, Luiz Carlos de; Poveda, Elisa; Zhang, Xiaoxin; Tarifa, Manuel; Wu, Zhenlin; Yu, Rena C.

doi:10.1016/j.ijimpeng.2019.03.003

Cited by 16 publications

(8 citation statements)

References 42 publications

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“…While the experimental work on the rate effect on flexural fracture in high strength concrete [9,10], the experimental campaign on the dynamic mixed-mode fracture of plain and steel fiber reinforced concrete by Ruiz et al [12] was designed to study the influence of loading velocity and fiber content on the developed crack patterns. The drop-weight device [11] designed and constructed in the Laboratory of Materials and Structures at the University of Castilla-La Mancha was employed for exerting different loading velocities (in particular 881, 1770 and 2660 mm/s) on notched beams by dropping a mass up to 120.6 kg.…”

Section: Experimental Observationsmentioning

confidence: 99%

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Meshfree modelling of dynamic fracture in fibre reinforced concrete

Yu¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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This work is concerned with the numerical study of dynamic mode I and mixedmode fracture in fiber reinforced concrete (FRC). A recently developed eigensoftening algorithm to deal with the fracture of quasi-brittle materials is employed in a meshfree framework. Threepoint bending tests on notched beams reinforced with steel fibers carried out through a drop weight device at two loading velocities are modelled herein. Since the notch was placed with an offset from the middle section, mixed-mode crack formation was facilitated. Three types of concrete with the same matrix reinforced with different amounts of steel fibers were used for these beams. All mechanical and fracture properties were measured through independent tests. Assuming a linear softening stress-equivalent crack opening relation, the numerical methodology is first validated against experimental results on plain concrete. Subsequently, it is applied to study the dynamic fracture of fiber reinforced concrete with a bilinear softening relation. The numerical simulations reproduced remarkably well the experimental results such as load-line displacements, crack patterns and reaction forces. The parametric studies show that the total energy dissipation plays an important role on the peak reaction load, whereas the transitional point between the two branches has a significant influence on the crack patterns. 1

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Section: Experimental Observationsmentioning

confidence: 99%

“…In the experimental campaign [12], concrete with the same matrix but reinforced with different fiber contents was tested. For instance, H00 is the base concrete, fabricated as a reference material, whereas H15 and H45 are with the same matrix but reinforced with 15 and 45 kg/m 3 of steel fibers.…”

Section: Experimental Observationsmentioning

confidence: 99%

Meshfree modelling of dynamic fracture in fibre reinforced concrete

Yu¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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“…Zhang et al [ 3 , 6 ] used strain gages on beams impacted by a drop weight impact device and measured crack velocities up to 417 m/s in plain concrete and 690 m/s in FRC. Recently, through inspection of high-speed video recordings, Ruiz et al [ 16 ] reported speed up to 650 m/s of mixed-mode crack in steel fiber-reinforced self-compacting concrete (SFRSCC). However, the effect of loading rate and fiber volume fraction on the crack propagation velocity in these relatively novel materials, is still in need of further investigation.…”

Section: Introductionmentioning

confidence: 99%

“…Figure16. Comparison of the obtained crack velocities using strain gages (SG), digital image Correlation (DIC) and numerical simulations (NUM) for PA, PB and PC beams impacted at 2.66 m/s.…”

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confidence: 99%

Propagation Speed of Dynamic Mode-I Cracks in Self-Compacting Steel Fiber-Reinforced Concrete

Pan

Zhang

et al. 2020

Materials

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The objective of this study is to measure the crack propagation speed in three types of self-compacting concrete reinforced with steel fibers loaded under four different loading rates. Central-notched prismatic beams with two types of fibers (13 mm and 30 mm in length), three fiber volume ratios, 0.51%, 0.77% and 1.23%, were fabricated. Four strain gages were glued on one side of the specimen notch to measure the crack propagation velocity, a fifth one at the notch tip to estimate the strain rates upon the initiation of a cohesive crack and the stress-free crack. A servo-hydraulic testing machine and a drop-weight impact device were employed to conduct three-point bending tests at four loading-point displacement rates, the former to perform tests at 2.2 μm/s, 22 mm/s and the latter for those at 1.77 m/s, 2.66 m/s, respectively. With lower fiber contents, smooth mode-I cracks were formed, the crack speed reached the order of 1 mm/s and 20 m/s. However, crack velocities up to 1417 m/s were obtained for the concrete with high content of fibers under impact loading. This value is fairly close to the theoretically predicted terminal crack velocity of 1600–1700 m/s. Numerical simulations based on cohesive theories of fracture and preliminary results based on the technique of Digital Image Correlation are also presented to complement those obtained from the strain gages. In addition, the toughness indices are calculated under all four loading rates. Strain hardening (softening) behavior accounting from the initiation of the first crack is observed for all three types of concrete at low (high) loading rates. Significant enhancement in the energy absorption capacity is observed with increased fiber content.

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“…Also, good studies have been conducted on the self-compacting concretes and their properties and their superiority over the common noncomposite concretes. Recently, most of the researches have been focused on self-compacting reinforced fiber concretes [34][35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of impact loading effects on rectangular flat panels of fiber self-compacting cementations composite with expanded steel sheet

Hatami

Dalvand

Chegeni

2020

J Braz. Soc. Mech. Sci. Eng.

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Impact loadings essentially differ from static loadings due to a huge amount of the force applied to milliseconds under these loadings. Energy absorption of composites is proper criteria to examine the function against impact loading. Energy absorbers are widely used in the industry. At the same time, due to their unique properties, the use of strong self-compacting composites has been considered by the researchers. High tensile, compressive, and flexural strengths have made these concrete composites more eminent. In a comprehensive experimental work, using four basic mix designs, 64 rectangular composite panels were made with 100 mm 2 of area and 30, 45, 60, and 75 mm thickness and tested by impact loading. Compressive, tensile, and flexural strength tests were performed on all the four max designs. Steel fibers with percentages of 0, 0.25, 0.5, and 0.75 with 25 m of length were used to make the concrete composites. A hammer with 180 kg weight and 7500 J power was used as the impact loading with drop hammer test machine (DH-TM). The specimens were dynamically loaded by drop test from a 60 cm height. The use of steel fibers and expanded sheets in combination with each other significantly increases the energy absorption. Moreover, the initial peak force increases, while crushing length and deformation of the specimens reduce.

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Dynamic mixed-mode fracture in SCC reinforced with steel fibers: an experimental study

Cited by 16 publications

References 42 publications

Meshfree modelling of dynamic fracture in fibre reinforced concrete

Meshfree modelling of dynamic fracture in fibre reinforced concrete

Propagation Speed of Dynamic Mode-I Cracks in Self-Compacting Steel Fiber-Reinforced Concrete

Experimental investigation of impact loading effects on rectangular flat panels of fiber self-compacting cementations composite with expanded steel sheet

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