Correlation between the accuracy of a SHPB test and the stress uniformity based on numerical experiments

Meng, Hao; Li, Qingming

doi:10.1016/s0734-743x(02)00073-8

Cited by 158 publications

(88 citation statements)

References 14 publications

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“…The SHPB specimen and pressure bars are simulated as a structural problem to obtain a 'reconstituted' axial stressstrain relation, whose deviation from the input axial stress-strain curve indicates the error due to the violation of the fundamental assumptions in an SHPB test. This so-called 'reconstitution method' has been adopted by some researchers, e.g., Bertholf and Karnes (1975), Meng and Li (2003) and Li and Meng (2003). The advantage of using a strain-rateindependent stress-strain input curve is that all discrepancies between the 'reconstituted' stress-strain curve and the input stress-strain curve are not due to the strain-rate effect, but due to other factors, which should be correctly interpreted in the analyses of the SHPB test results.…”

Section: Methodsmentioning

confidence: 99%

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Further investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests. Part II: Numerical simulations

Meng³

2009

International Journal of Impact Engineering

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159

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Further investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests Part II Numerical Simulations. International Journal of Impact Engineering, Elsevier, 2009, 36 (12) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. shows that it is necessary to use a kinetic friction model, rather than a constant friction model, for more accurate numerical simulation of SHPB tests. M A N U S C R I P T A C C E P T E D ARTICLE IN PRESS

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Section: Methodsmentioning

confidence: 99%

“…Further discussion on the 'reconstitution method' is given in Meng and Li (2003) and Li and Meng (2003).…”

Section: Methodsmentioning

confidence: 99%

Further investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests. Part II: Numerical simulations

Meng³

2009

International Journal of Impact Engineering

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159

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“…Bischoff and Perry (1991) also commented that the height-width ratio of the specimen as well as its overall size could affect the crack pattern by influencing end boundary effects and thus affect the maximum strength and deformability of the tested specimen. Meng and Li (2003) investigated the effect of frictional coefficient by numerical simulation and showed that the coefficient of friction has greater influence on the lateral constrains for a shorter specimen than a longer specimen. Further investigations on the DIF in concrete-like materials will be presented in a companion paper by Li et al(2009) based on numerical simulation.…”

Section: A C C E P T E D Article In Pressmentioning

confidence: 99%

Further investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests. Part I: Experiments

Zhang¹,

Wu²,

Li³

et al. 2009

International Journal of Impact Engineering

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242

126

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Effects of the inertia-induced radial confinement on the dynamic increase factor (DIF) of a mortar specimen are investigated in split Hopkinson pressure bar (SHPB) tests. It is shown that axial strain acceleration is unavoidable in SHPB tests on brittle samples at high strain-rates although it can be reduced by the application of a wave shaper. By introducing proper measures of the strain-rate and axial strain acceleration, their correlations are established. In order to demonstrate the influence of inertia-induced confinement on the dynamic compressive strength of concrete-like materials, tubular mortar specimens are used to reduce the inertia-induced radial confinement in SHPB tests. It is shown that the DIF measured by SHPB tests on tubular specimens is lower than the DIF measured by SHPB tests on solid specimens. This paper offers experimental support for a previous publication , Int. J. of Solids and Struct., 40,[343][344][345][346][347][348][349][350][351][352][353][354][355][356][357][358][359][360], which claimed that inertia-induced radial confinement makes a large contribution to the dynamic compressive strength enhancement of concrete-like materials when the strain-rate is greater than a critical transition strain-rate between 10 1 and 10 2 s -1 . It is concluded that DIF formulae for concrete-like materials measured by split Hopkinson pressure bar tests need to be corrected if they are going to be used as the unconfined uniaxial compressive strength in the design and numerical modelling of structures made from concrete-like materials to resist impact and blast loads.

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“…The split Hopkinson pressure bar (SHPB), which was first introduced by Hopkinson [1] in 1914 and further developed by Kolsky [2], Davies and Hunter [3], as well as others [4][5][6][7], is an effective method to characterize the dynamic behavior of materials at intermediate strain rates. The SHPB has been widely used to investigate the dynamic mechanical properties of materials under uniaxial compression [5,6,[8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effects of imperfect experimental conditions on stress waves in SHPB experiments

Yin

Yan

et al. 2015

Acta Mech. Sin.

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Experimental and numerical simulations were undertaken to estimate the effects of imperfect conditions on stress waves in split Hopkinson pressure bar (SHPB) experiments. The photonic Doppler velocimetry (PDV) measurement results show that the rise and fall times of an incident wave increases with an increasing inclination angle; also, the fluctuations of the incident wave disappear gradually with the increase of inclination angle. The following characteristics for various defects in the SHPB were obtained by numerical simulation: (1) the influence of a curved bar was negligible; (2) misalignment modestly affects the fluctuation characteristics, and bending waves were generated at this condition; (3) inclination and indentation of the impact endsurface had a great impact on the incident waves, and both of them increase the rise time of the incident wave by increasing the degree of defects. In view of the results, misalignment, inclination, and indentation in SHPB experiments should be minimized.

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Correlation between the accuracy of a SHPB test and the stress uniformity based on numerical experiments

Cited by 158 publications

References 14 publications

Further investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests. Part II: Numerical simulations

Further investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests. Part II: Numerical simulations

Further investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests. Part I: Experiments

Effects of imperfect experimental conditions on stress waves in SHPB experiments

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