Separation of waves propagating in an elastic or viscoelastic Hopkinson pressure bar with three-dimensional effects

Bacon, C.

doi:10.1016/s0734-743x(98)00048-7

Cited by 68 publications

(44 citation statements)

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“…A low impedance minimises the "ring-up" time for the low strength (few MPa) PBX specimens while maintaining the simplicity of elastic analysis [14]. Viscoelastic polymer bars have been developed and analysed by a number of research groups [27][28][29][30][31][32][33][34][35][36][37][38][39], but so far these have not been used for obtaining data at non-ambient temperatures as the analysis is complicated [40]. Metal tubes made from aluminium or magnesium alloys also have mechanical impedances comparable to polymers, but in order to use a tube as the output bar the load has to be transferred from the specimen to the tube via an endcap [41], which is mechanically more complex a simple rod.…”

Section: Experimental Methodsmentioning

confidence: 99%

Temperature and strain rate effects on the mechanical properties of a polymer-bonded explosive

Walley

Taylor

Williamson

2018

Eur. Phys. J. Spec. Top.

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Abstract. The aim of the research reported here was to investigate the strain rate and temperature sensitivity of Rowanex 1100 Type 1A, a polymer-bonded explosive (PBX). The stress supported by this PBX at high rates of deformation (1750 ± 225 s −1 ) was found to be about an order of magnitude greater than that supported at low rates (0.015 s −1 ). Temperature was also found to have a large effect, with the strength of the material decreasing exponentially with temperature over the range studied (-60 to +60• C). The exponents for the decay of the PBX's strength with temperature at both low and high strain rates were the same within experimental error. So a temperature/strain rate shift factor could be determined and was found to be 31.2 ± 2.4 K/decade of strain rate.

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Section: Experimental Methodsmentioning

confidence: 99%

Temperature and strain rate effects on the mechanical properties of a polymer-bonded explosive

Walley

Taylor

Williamson

2018

Eur. Phys. J. Spec. Top.

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“…Split Hopkinson pressure bars (SHPB) technique is one of widely used apparatuses to investigate the strain rate dependency of material properties [1]. SHPB techniques allow relatively uniform deformation conditions with very high strain rates in uni-axial compression tests [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of the dynamic failure behavior of rock materials subjected to various impact loads

Kang¹,

Kang²,

Kim³

et al. 2014

WIT Transactions on the Built Environment

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An understanding of the effect of strain rate on the dynamic failure and mechanical properties of rock materials is important in the design of rock structures against missile impact or the penetration analysis of projectiles into rock mass. In this study, a pulse shape-controlled Split Hopkinson Pressure Bar system was used to impact rock materials. The impact velocity of the impact bar had been increased to 5m/sec from 30m/sec and complete compressive stressstrain curves were obtained to investigate the effect of strain rate on the dynamic failure of the rock materials. The micro-focus X-ray computerized tomography was used to scan the tested samples and the failure process of rock materials were discussed. The numerical simulations on SHPB tests of rock materials were carried out with the explicit finite element software ANSYS LS-DYNA. The incident stress waveforms obtained from the SHPB test are directly applied to the input into the end side of the incident bar. The numerical stress-strain curves are compared with the experimental curves with a different strain rate.

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“…Two-and three-dimensional (2-D and 3-D) wave propagation in Hopkinson bar tests has been investigated numerically by several authors (22,23). In experimental studies, impact velocity of the striker bar and axial strain on the bar surfaces are the most commonly measured quantities.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Layer Constraint on Stress Wave Propagation in Multilayer Composite Materials

Taşdemirci¹,

Hall²,

Gama³

et al. 2004

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY) September 2004 REPORT TYPE AUTHOR(S)Alper Tasdemirci,* Ian W. Hall,* Bazle A. Gama,* and Mustafa Guden † 5f. WORK UNIT NUMBER PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)University SPONSOR/MONITOR'S ACRONYM(S)ARL-CR-550 SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)U.S. Army Research Laboratory ATTN: AMSRD-ARL-WM-MB Aberdeen Proving Ground, MD 21005-5066 SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTMultilayer materials consisting of ceramic and glass/epoxy with a rubber interlayer have been subjected to a high strain rate compression using a split-Hopkinson Pressure Bar (SHPB). The feasibility of modeling stress wave propagation in complex multilayer materials has been demonstrated. It has been shown that the effects of lateral confinement of a normally low-modulus interlayer material can significantly affect the response to wave propagation.Numerical modeling clearly shows that severe stress inhomogeneities and discontinuities exist, and these may have serious consequences for the mechanical and other properties. The one-dimensional stress state usually assumed for conventional SHPB testing is therefore inapplicable, and both numerical and experimental results have to be coupled for a complete understanding of the wave propagation characteristics. In this study, both methods were used, and the stress states inside the components were presented. iii

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Separation of waves propagating in an elastic or viscoelastic Hopkinson pressure bar with three-dimensional effects

Cited by 68 publications

References 0 publications

Temperature and strain rate effects on the mechanical properties of a polymer-bonded explosive

Temperature and strain rate effects on the mechanical properties of a polymer-bonded explosive

Experimental and numerical study of the dynamic failure behavior of rock materials subjected to various impact loads

The Effects of Layer Constraint on Stress Wave Propagation in Multilayer Composite Materials

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