Dynamic Brazilian Test of Brittle Materials Using the Split Hopkinson Pressure Bar and Digital Image Correlation

Chen, J. J.; Guo, Baoqiao; Liu, H. B.; Liu, H.; Chen, P. W.

doi:10.1111/str.12118

Cited by 49 publications

(18 citation statements)

References 19 publications

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“…The failure pattern of the specimen is a key character of the mechanical behaviours of concrete materials, which is usually represented by collecting the fragments of the broken specimen . With the improvement of experimental technology, the high‐speed camera digital measuring is widely used to capture the failure process of the specimen in the SHPB experiment . Based on the failure characteristics of the specimen, three typical failure patterns are visible at different strain rates, as shown in Table .…”

Section: Resultsmentioning

confidence: 99%

“…55 With the improvement of experimental technology, the high-speed camera digital measuring is widely used to capture the failure process of the specimen in the SHPB experiment. 43 Based on the failure characteristics of the specimen, three typical failure patterns are visible at different strain rates, as shown in Table 2. It shows that the strain rate can obviously affect the failure pattern of the specimen.…”

Section: Failure Patternsmentioning

confidence: 99%

“…The stress evolution is recorded by strain gauges on the pressure bars. Based on this indirect SHPB testing technique, Chen et al confirmed that the dynamic Brazilian experiment is an effective method to investigate the dynamic tensile behaviours of brittle materials; the results revealed that the dynamic tensile strength is more sensitive to the average strain rate than the compressive strength of concrete. The dynamic increase factor (DIF) of concrete can be more than 6 in tension strength, while it was only about 2 in compression strength at similar strain rate .…”

Section: Introductionmentioning

confidence: 96%

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Dynamic splitting tensile properties of concrete and cement mortar

Liu

Zhou

et al. 2019

Fatigue Fract Eng Mat Struct

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To investigate the dynamic tensile behaviours of concrete and cement mortar, a 50‐mm split Hopkinson pressure bar was applied on Brazilian disc specimens for dynamic tensile experiments, in which strain rate varied from 10−5 to 20 s−1. The high‐speed camera testing technique was used to capture the dynamic fractured process of the specimens at relative high strain rate. The experimental results revealed that the dynamic tensile strength of concrete specimens has a stronger strain rate effect than that of cement mortar specimens. Then three typical failure patterns of the specimens were confirmed in dynamic experiments. In addition, one‐parameter semi‐empirical relation between dynamic tensile strength and strain rate was established. Finally, the limitation of dynamic splitting experiments on Brazilian disc specimens was discussed in detail at high strain rate, in which the crack initiates from the contact point between the incident bar and specimens rather than the centre of the specimens.

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Section: Resultsmentioning

confidence: 99%

Section: Failure Patternsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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Dynamic splitting tensile properties of concrete and cement mortar

Liu

Zhou

et al. 2019

Fatigue Fract Eng Mat Struct

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“…Brittle materials such as rock and concrete are strain‐rate sensitive, and different loading rates result in a change in mechanical properties and fracture behaviours . Experiments under different impact velocities were carried out in this paper.…”

Section: Test Results and Analysesmentioning

confidence: 99%

Failure process and mechanism of sandstone under combined equal biaxial static compression and impact loading

Peng

Zhang

et al. 2018

Strain

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The process and mechanism of impact fractures in sandstone were investigated under equal biaxial static compression. The cracking process was captured by a high‐speed video camera. The results indicate that the main crack propagates along the circumference and finally forms a crater‐shaped failure zone. The size of the crater‐shaped failure zone increases as the static stress and impact velocity increase. In addition, microscopic features of the fracture surface were observed using a scanning electron microscope. It was found that the microcracks expand after combination loading, making the rock more susceptible to damage. Finally, the influence mechanism of static loading on dynamic failure of the rock was revealed by theoretical analysis and numerical simulation.

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“…The high-rate digital image correlation (DIC) is a further development of the above described techniques [12,13]. In this case, information about specimen deformation is given by motion analysis of a large number of points (speckle) spreading over the surface of the specimen gauge length [14,15].…”

mentioning

confidence: 99%

Strain measuring accuracy with splitting-beam laser extensometer technique at split Hopkinson compression bar experiment

Panowicz¹,

Janiszewski²,

Traczyk³

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. An accuracy problem of strain measurement at compression split Hopkinson compression bar experiments with a splitting-beam laser extensometer was considered. The splitting-beam laser extensometer technique was developed by Nie et al. to measure strain of a specimen during its tension under a high strain rate loading condition. This novel concept was an inspiration for the authors to develop own laser extensometer system, which allows for simultaneous and independent measurement of displacement of bar ends between which a compressed material specimen is placed. In order to assess a metrological property of this measuring system, a wide range of high strain rate experiments were performed, including tests with various sample materials (Al 5251, Cu OFE) with different rate of strain, and with the use of two bars material. A high accuracy of the developed laser extensometer was found in measurement of specimen strain, for which uncertainty is not greater than 0.1% and, for a typical specimen dimension, the maximum permissible error is 4.5 μm.Key words: SHPB test, strain rates, non-contact strain measurement, laser extensometer. The simplest approach is to use a high speed digital camera to photograph the specimen deformation [10,11]. The camera is focused on the entire gauge section and part of the nongauge section at both ends to achieve a sufficient image with the highest resolution possible. Due to motion analysis of the selected characteristic points, defining the strain gage length, a strain-time relationship can be determined. However, due to the limited frame rate and its corresponding resolution of a contemporary high speed camera, the obtained results did not provide sufficient data points to construct a full stress-strain curve [8]. Strain measuring accuracy with splitting-beam laserThe high-rate digital image correlation (DIC) is a further development of the above described techniques [12,13]. In this case, information about specimen deformation is given by motion analysis of a large number of points (speckle) spreading over the surface of the specimen gauge length [14,15]. A random speckle pattern is generated by a spraying black paint and a white base layer directly onto the surface of the specimen. Thus, DIC provides highly valuable information on dynamic full-field strain measurements in the specimen, however, the above-mentioned limitations resulting from the usage of a contemporary high speed camera and an extreme difficulty in acquiring a large quantity of high-resolution images at very high frame rates do not allow for constructing a precise stressstrain curve [8].Another strain measuring technique is the interferometric-strain-gauge method, which is one of the first diagnostic techniques applied to straightforward non-contact measurement of specimen strain in SHPB testing. Sharpe et al. [16] used this method for evaluation of strain uniformity in the compressed specimen by comparison of surface strain at the specimen midpoint to the average strain calculated from the conventional Kolsk...

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Dynamic Brazilian Test of Brittle Materials Using the Split Hopkinson Pressure Bar and Digital Image Correlation

Cited by 49 publications

References 19 publications

Dynamic splitting tensile properties of concrete and cement mortar

Dynamic splitting tensile properties of concrete and cement mortar

Failure process and mechanism of sandstone under combined equal biaxial static compression and impact loading

Strain measuring accuracy with splitting-beam laser extensometer technique at split Hopkinson compression bar experiment

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