Impact Testing of Concrete Using a Drop-Weight Impact Machine

Řeháček, Stanislav; Huňka, Petr; Čítek, David; Kolı́sko, Jiřı́; Šimúnek, Ivo

doi:10.4028/www.scientific.net/amr.1106.225

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…The distributed inertial load could be replaced by a generalized point inertial load, and then the generalized bending load was obtained by subtracting the inertial load from impact load. The impact load and the inertial load in the dynamic system could be replaced by bending load alone to form the equivalent static system 39 . The sum of reaction forces measured from supports were equal to the difference between impact load and inertial load.…”

Section: Methodsmentioning

confidence: 99%

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The influence from steel bar on concrete fracture behavior under different impact velocities

Song

Wang

Zhang

et al. 2021

Structural Concrete

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Three‐point bending tests on notched plain concrete beams and lightly reinforced concrete beams were carried out with a drop‐hammer impact instrument. The shape of the specimen followed the RILEM recommendation, that is, 150 mm × 150 mm in cross section, 800 mm in length, and span was kept constant 600 mm. And only one conventional steel bar was placed in the lightly reinforced concrete beam. The high‐speed camera and digital image correlation (DIC) technology were applied to catch the fracture process under dynamic loads. And the reaction force, mid‐span deflection, crack velocity, the horizontal strain of concrete at the notch root, and the strain of steel bar midpoint were measured over three impact velocities (i.e., 9.89 × 102, 1.71 × 103, and 2.21 × 103 mm/s). The test results showed that the dynamic fracture energy for plain concrete and reinforced concrete increased with the increase of the impact velocity. When the impact velocity reached 2.21 × 103 mm/s, the steel bar reached yielding, which resulted in the influence from reinforcement on fracture energy weakened. Both of the dynamic fracture toughness for plain concrete and lightly reinforced concrete increased linearly as the growth of impact velocity. Furthermore, the crack extended with a decreasing speed for plain concrete and reinforced concrete. And the first‐stage crack velocity in concrete was inhibited effectively by steel bar, but the inhibitory effect declined as the increase of impact velocities.

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Section: Methodsmentioning

confidence: 99%

“…The impact load and the inertial load in the dynamic system could be replaced by bending load alone to form the equivalent static system. 39 The sum of reaction forces measured from supports were equal to the difference between impact load and inertial load.…”

Section: The Dynamic Fracture Energymentioning

confidence: 99%

The influence from steel bar on concrete fracture behavior under different impact velocities

Song

Wang

Zhang

et al. 2021

Structural Concrete

View full text Add to dashboard Cite

show abstract

“…The problem in this paper came from the process of measuring the displacement of the falling weight by using the laser displacement sensor when checking the falling weight impact testing machines. Falling weight impact testing machines are widely used in falling weight impact resistance tests of pipes, plates, and industrial products [2][3] . By checking the condition of the sample after being impacted, the external impact resistance of the material or product can be evaluated 4 .…”

Section: Introductionmentioning

confidence: 99%

Algorithm for local nonlinear error calibration of displacement sensor based on C2 continuous interpolation

Wang

Liu

et al. 2022

Optical Metrology and Inspection for Industrial Applications IX

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The laser displacement sensor based on the triangulation method has the advantages of large range, high precision, and strong anti-interference. Due to the limitation of the measurement principle, although the laser displacement sensor has high repeated measurement accuracy, it has serious high-order nonlinear system errors. Considering that in some measurement occasions, only a few local measurement intervals within the range are used. In this paper, a local nonlinear error calibration algorithm based on C2 continuous interpolation was proposed. A nonlinear calibration model was established by intensive calibration data acquisition in the local interval of the measurement application. The model can be smoothly connected with the original linear calibration model. At the same time, the measurement accuracy of the local area is greatly improved without affecting the accuracy of other intervals.

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Impact strength and mechanical properties of high strength concrete containing PET waste fiber

Mohammed

Karim

2023

Journal of Building Engineering

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Impact Testing of Concrete Using a Drop-Weight Impact Machine

Cited by 7 publications

References 4 publications

The influence from steel bar on concrete fracture behavior under different impact velocities

The influence from steel bar on concrete fracture behavior under different impact velocities

Algorithm for local nonlinear error calibration of displacement sensor based on C2 continuous interpolation

Impact strength and mechanical properties of high strength concrete containing PET waste fiber

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