Design of a split Hopkinson pressure bar with partial lateral confinement

Barr, A.D.; Clarke, Steve; Rigby, S.E.; Tyas, A.; Warren, James A.

doi:10.1088/0957-0233/27/12/125903

Cited by 4 publications

(4 citation statements)

References 22 publications

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“…To reduce the impact of the friction coefficient, Vaseline was applied evenly on the interfaces to control μ between 0.02 and 0.06. In this way, the friction coefficient meets the test requirements, and the friction effect can be neglected [16].…”

Section: Interface Friction Effectmentioning

confidence: 98%

Split-Hopkinson Pressure Bar Test and Numerical Simulation of Steel Fiber-reinforced High-strength Concrete

Ji¹,

Shi²,

He³

et al. 2019

RCMA

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The fabrication and optimization of the shelter layer are critical to the performance of the protective works. The novel shelter layer made of steel fiber-reinforced high-strength concrete (SFRHSC) is much more advantageous than that of ordinary concrete. This paper carries out a split-Hopkinson pressure bar (SHPB) test on the steel fiber and high-strength concrete, two main components of the SFRHSC, aiming to disclose the failure features and dynamic compressive strength of the SFRHSC under dynamic conditions. Specifically, the SFRHSC specimens with 0 %, 0.5 % and 1.0 % of steel fiber were subjected to impact compression test under the air pressures of 0.7, 0.9 and 1.0MPa, respectively. In addition, the impact compression process was also numerically simulated on the finite-element software LS-DYNA. The research results show that: the increase in strain rate pushed up the dynamic compressive strength of the SFRHSC, that is, the failure degree of the specimen was greatly enhanced by the strain rate; under the air pressure of 0.7MPa, the specimen with 1.0 % of steel fiber had the highest dynamic compressive strength (180.9MPa), 22.6 % higher than that of the specimen with no steel fiber; the numerical simulation reproduced the one-dimensional (1D) propagation of the stress wave in the bars, which proves the hypothesis of 1D elastic stress wave, and restaged the impact compression process on the SFRHSC, outputting results similar to the test data. Keywords: steel fiber-reinforced high-strength concrete (SFRHSC), impact compression, strain rate effect, numerical simulation Camouflaged layer Bursting layer Distribution layer Supporting structure Revue des Composites et des Matériaux Avancés

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Section: Interface Friction Effectmentioning

confidence: 98%

Split-Hopkinson Pressure Bar Test and Numerical Simulation of Steel Fiber-reinforced High-strength Concrete

Ji¹,

Shi²,

He³

et al. 2019

RCMA

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“…The soil around the pipe was modelled using the equation of state and shear data for a well-characterised sand from high pressure quasi-static experiments (Barr et al, 2018(Barr et al, , 2019. Strain rate effects were not explicitly modelled, as strain rate was shown to have no influence on the stiffness of this sand between quasi-static and high strain rates, and research on shear in soils at high strain strain rates is still ongoing (Barr et al, 2016). Data for wet sand (7% moisture content) was used, as this increases compressibility and decreases the shear strength of the soil, providing a more conservative estimate of crater size.…”

Section: Modelling Setupmentioning

confidence: 99%

Predicting Crater Formation from Failure of Pressurized Water Mains through Analogy with Buried Explosive Events

Barr

Rigby

Collins

et al. 2020

J. Pipeline Syst. Eng. Pract.

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Brittle failure of a buried pressurised water pipe can result in rapid crater formation and throw debris over large distances, as well as longer-term flooding and scour effects. Due to the potential for injury and property damage in a failure event, it is desirable to develop policies to enforce safe stand-off distances around high-risk pipes. Little published data is available on the formation of craters during the initial pressure release from a pipe burst, but an analogy can be made with buried explosives events, for which a large body of data exists. This paper uses finite-element modelling of buried pipe failures to assess the parameters affecting crater diameter, where pipe diameter, pressure, air content and burial depth are shown to be significant. An explosive cratering tool is modified for use with water pipes by converting the energy release from a failing pipe to an equivalent mass of explosive. The modified tool reliably replicates the crater size from the modelling results, and accurately predicts the modelled crater size in new failure scenarios (r 2 = 0.95), indicating the potential of the tool for use in developing policy around safe stand-off distances.

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“…Both compression and dilation were observed during deviatoric loading in these experiments. Recent triaxial testing approaches (Martin et al 2013, Barr et al 2016a) have begun to explore the shear response of soils at very high strain rates: further comparison with high-pressure quasi-static data is required to investigate whether existing models of shear behaviour hold under this extreme loading. This paper demonstrates the use of a high-pressure multi-axial test apparatus to characterise the quasi-static compressibility and failure surface of quartz sands to pressures of 800 MPa and 400 MPa, respectively.…”

Section: Introductionmentioning

confidence: 99%

High-pressure compressibility and shear strength data for soils

2019

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Soil behaviour is often an important consideration in the design of protective systems for blast and impact threats, as the properties of a soil can greatly affect the impulse generated from buried explosive devices, or the ability of a soil-filled structure to resist ballistic threats. Numerical modelling of these events often relies on extrapolation from low-pressure experiments. To develop soil models that remain accurate at very high pressures there is a need for data on soil behaviour under these extreme conditions. This paper demonstrates the use of a high-pressure multi-axial test apparatus to provide compressibility and shear strength data for four dry sandy soils. One-dimensional compression experiments were performed to axial stresses of 800 MPa, where the effects of particle-size distribution were observed with respect to compressibility and bulk unloading modulus. Each soil followed a bilinear normal compression line (NCL): more uniform soils initially had higher compression indices, but all four NCLs began to converge at void ratios below e ≈ 0.3. The failure surface of a sand was characterized to mean effective stress [Formula: see text] > 400 MPa using reduced triaxial compression experiments, removing the need to rely on extrapolation from low-pressure data.

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Design of a split Hopkinson pressure bar with partial lateral confinement

Cited by 4 publications

References 22 publications

Split-Hopkinson Pressure Bar Test and Numerical Simulation of Steel Fiber-reinforced High-strength Concrete

Split-Hopkinson Pressure Bar Test and Numerical Simulation of Steel Fiber-reinforced High-strength Concrete

Predicting Crater Formation from Failure of Pressurized Water Mains through Analogy with Buried Explosive Events

High-pressure compressibility and shear strength data for soils

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