A gravity-driven split Hopkinson tension bar for investigating quasi-ductile and strain-hardening cement-based composites under tensile impact loading

Heravi, Ali A.; Curosu, Iurie; Mechtcherine, Viktor

doi:10.1016/j.cemconcomp.2019.103430

Cited by 30 publications

(19 citation statements)

References 37 publications

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“…In case of the matrix M1 and SHCC M1-6PE, the values obtained were slightly higher than the quasi-static ones. A similar trend was observed in [ 21 ], where comparable materials were tested using a tensile stress wave in a split-Hopkinson tension bar.…”

Section: Results Of the Compression Testssupporting

confidence: 82%

“…Properties of the HDPE fibers are presented in Table 2 . Since the plain matrix was named M1 in the previous investigations [ 20 , 21 ], the same name is used in this study. The SHCC mixtures made of 6 and 12 mm PE fibers are denoted as M1-6PE and M1-12PE, respectively.…”

Section: Experimental Programmentioning

confidence: 99%

“…This paper reports an experimental study of the compressive behavior of SHCC and its constituent non-reinforced matrix under impact loading using a SHPB. Two SHCC mixtures under investigation previously showed favorable behavior under impact tensile loading [ 20 , 21 ]. The same normal-strength cement-based matrix is used for both SHCC mixtures.…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Investigation of the Behavior of Strain-Hardening Cement-Based Composites (SHCC) under Impact Compression and Shear Loading

et al. 2020

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The ductile behavior of strain-hardening cement-based composites (SHCC) under direct tensile load makes them promising solutions in applications where high energy dissipation is needed, such as in earthquakes, impacts by projectiles, or blasts. However, the superior tensile ductility of SHCC due to multiple cracking does not necessarily point to compressive and shear ductility. As an effort to characterize the behavior of SHCC under impact compressive and shear loading relevant to the aforementioned high-speed loading scenarios, the paper at hand studies the performance of a particular SHCC and its constituent, cement-based matrices using the split-Hopkinson bar method. For compression experiments, cylindrical specimens with a length-to-diameter ratio (l/d) of 1.6 were used. The selected length of the sample led to similar failure modes under quasi-static and impact loading conditions, necessary to a reliable comparison of the observed compressive strengths. The impact experiments were performed in a split-Hopkinson pressure bar (SHPB) at a strain rate that reached 110 s−1 at the moment of failure. For shear experiments, a special adapter was developed for a split-Hopkinson tension bar (SHTB). The adapter enabled impact shear experiments to be performed on planar specimens using the tensile wave generated in the SHTB. Results showed dynamic increase factors (DIF) of 2.3 and 2.0 for compressive and shear strength of SHCC, respectively. As compared to the non-reinforced constituent matrix, the absolute value of the compressive strength was lower for the SHCC. Contrarily, under shear loading, the SHCC demonstrated higher shear strength than the non-reinforced matrix.

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Section: Results Of the Compression Testssupporting

confidence: 82%

Section: Experimental Programmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Experimental Investigation of the Behavior of Strain-Hardening Cement-Based Composites (SHCC) under Impact Compression and Shear Loading

et al. 2020

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“…Cylindrical concrete specimens are tested in a gravity-driven split-Hopkinson tension bar to investigate performance of the material at high strain rates (Heravi et al, 2019), see Fig. 1.…”

Section: Methodsmentioning

confidence: 99%

Crack Width Measurement for Non-Planar Surfaces by Triangle Mesh Analysis in Civil Engineering Material Testing

Liebold¹,

Maas²,

Heravi³

2019

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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Abstract. This publication concentrates on the photogrammetric crack width measurement of crack patterns of concrete probes under impact loading in high-speed stereo image sequences. The presented algorithm works for non-planar specimens with deformations that only appear tangential to the surface and the method is based on triangle mesh analysis. Experiments were conducted with cylindrical specimens with an impact load affecting parallel to the main axis of the cylinder.

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“…The finely grained matrix is used as the constituent matrix of strain hardening cement-based composites (SHCC), and its behavior under impact tensile loading has been investigated previously. Since the matrix was named M1 in the previous investigations [ 26 , 27 ], the same name is used in this study.…”

Section: Experimental Programmentioning

confidence: 99%

Crack Propagation Velocity Determination by High-speed Camera Image Sequence Processing

et al. 2020

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The determination of crack propagation velocities can provide valuable information for a better understanding of damage processes of concrete. The spatio-temporal analysis of crack patterns developing at a speed of several hundred meters per second is a rather challenging task. In the paper, a photogrammetric procedure for the determination of crack propagation velocities in concrete specimens using high-speed camera image sequences is presented. A cascaded image sequence processing which starts with the computation of displacement vector fields for a dense pattern of points on the specimen’s surface between consecutive time steps of the image sequence chain has been developed. These surface points are triangulated into a mesh, and as representations of cracks, discontinuities in the displacement vector fields are found by a deformation analysis applied to all triangles of the mesh. Connected components of the deformed triangles are computed using region-growing techniques. Then, the crack tips are determined using the principal component analysis. The tips are tracked in the image sequence and the velocities between the time stamps of the images are derived. A major advantage of this method as compared to the established techniques is in the fact that it allows spatio-temporally resolved, full-field measurements rather than point-wise measurements. Furthermore, information on the crack width can be obtained simultaneously. To validate the experimentation, the authors processed image sequences of tests on four compact-tension specimens performed on a split-Hopkinson tension bar. The images were taken by a high-speed camera at a frame rate of 160,000 images per second. By applying the developed image sequence processing procedure to these datasets, crack propagation velocities of about 800 m/s were determined with a precision in the order of 50 m/s.

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A gravity-driven split Hopkinson tension bar for investigating quasi-ductile and strain-hardening cement-based composites under tensile impact loading

Cited by 30 publications

References 37 publications

An Experimental Investigation of the Behavior of Strain-Hardening Cement-Based Composites (SHCC) under Impact Compression and Shear Loading

An Experimental Investigation of the Behavior of Strain-Hardening Cement-Based Composites (SHCC) under Impact Compression and Shear Loading

Crack Width Measurement for Non-Planar Surfaces by Triangle Mesh Analysis in Civil Engineering Material Testing

Crack Propagation Velocity Determination by High-speed Camera Image Sequence Processing

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