Dynamic Tensile Characterization of a 4330-V Steel with Kolsky Bar Techniques

Song, Bo; Antoun, Bonnie R.; Jin, H.

doi:10.1007/s11340-013-9721-x

Cited by 26 publications

(40 citation statements)

References 24 publications

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“…[25][26][27] We expect, therefore, that the techniques described here can readily be adapted to a wide range of loading conditions. It should also be possible to combine in situ diffraction with in situ radiography and/or phase contrast imaging (as has previously been done in the context of rapid phase transformations 28 ).…”

Section: Discussionmentioning

confidence: 99%

Time-resolved x-ray diffraction techniques for bulk polycrystalline materials under dynamic loading

Lambert

Hustedt

Vecchio

et al. 2014

Review of Scientific Instruments

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We have developed two techniques for time-resolved x-ray diffraction from bulk polycrystalline materials during dynamic loading. In the first technique, we synchronize a fast detector with loading of samples at strain rates of ~10(3)-10(4) s(-1) in a compression Kolsky bar (split Hopkinson pressure bar) apparatus to obtain in situ diffraction patterns with exposures as short as 70 ns. This approach employs moderate x-ray energies (10-20 keV) and is well suited to weakly absorbing materials such as magnesium alloys. The second technique is useful for more strongly absorbing materials, and uses high-energy x-rays (86 keV) and a fast shutter synchronized with the Kolsky bar to produce short (~40 μs) pulses timed with the arrival of the strain pulse at the specimen, recording the diffraction pattern on a large-format amorphous silicon detector. For both techniques we present sample data demonstrating the ability of these techniques to characterize elastic strains and polycrystalline texture as a function of time during high-rate deformation.

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Section: Discussionmentioning

confidence: 99%

Time-resolved x-ray diffraction techniques for bulk polycrystalline materials under dynamic loading

Lambert

Hustedt

Vecchio

et al. 2014

Review of Scientific Instruments

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“…Similar problems occur in tensile SHPB, where the stress wave is disturbed at the interfaces of adapters, couplers as well as threads [6,7]. Moreover, deformation non-uniformity of the specimen gauge section is an additional source of errors in strain measuring in high strain rate tension tests [8,9]. Therefore, in the SHPB experiments, the strain measurements pose a great challenge and require an advanced measuring technique, particularly while determining the stress-strain response of materials at small strains.…”

Section: Introductionmentioning

confidence: 99%

“…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]. …”

mentioning

confidence: 95%

“…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 Kolsky bar analysis.…”

mentioning

confidence: 99%

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confidence: 99%

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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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Kolsky Tension Bar Techniques for Dynamic Characterization of Alloys

Song

Jin

Antoun

2011

Conference Proceedings of the Society for Experimental Mechanics Series

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Dynamic stress-strain response associated with damage and failure mechanisms of alloys is desired to be quantitatively determined. Dynamic tensile characterization has been demonstrated an efficient method for such an investigation. However, reliable dynamic tensile characterization relies on appropriate experimental instruments and procedure. In this study, we employed a newly developed Kolsky tension bar to characterize the tensile properties of alloys [1,2]. Challenges and remedies in the dynamic tensile characterization with the Kolsky tension bar are presented.

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Dynamic Tensile Characterization of a 4330-V Steel with Kolsky Bar Techniques

Cited by 26 publications

References 24 publications

Time-resolved x-ray diffraction techniques for bulk polycrystalline materials under dynamic loading

Time-resolved x-ray diffraction techniques for bulk polycrystalline materials under dynamic loading

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

Kolsky Tension Bar Techniques for Dynamic Characterization of Alloys

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