Dynamic High Stress Experiments on Soil

Drnevich, VP; Felice, CW; Gaffney, E. S.; Brown, J.; Olsen, JM

doi:10.1520/gtj10545j

Cited by 43 publications

(5 citation statements)

References 9 publications

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“…For example, results have been reported on the effect of unsaturated water levels on silica sand [5], on the mechanical behavior of soft soil [6], clayey/silty soil [7] and dry sand [8] under confinement, and effect of moisture on sand mechanical properties [9] at relatively low compressive stress levels, as well as the mechanical behavior of dry sand under single pulse loading [10]. For dense sand under initial loading, its mechanical impedance is low.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mass Density on the Compressive Behavior of Dry Sand Under Confinement at High Strain Rates

Luo

Cooper

et al. 2011

Exp Mech

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Dynamic compressive behavior of dry quartz sand (Quikrete #1961 sand quarried in Pensacola, FL) under confinement was characterized using a modified long split Hopkinson pressure bar (SHPB). Sand grains were confined inside a hollow cylinder of hardened steel and capped by cemented tungsten carbide cylindrical rods. This assembly was subjected to repeated shaking to consolidate sand to attain precise bulk mass densities. It is then sandwiched between incident and transmission bars on SHPB for dynamic compression measurements. Sand specimens of five initial mass densities, namely, 1.51, 1.57, 1.63, 1.69, and 1.75 g/cm 3 , were characterized at high strain rates near 600 s −1 , to determine the volumetric and deviatoric behaviors through measurements of both axial and transverse responses of a cylindrical sand sample under confinement. The stress-strain relationship was found to follow a power law relationship with the sand initial bulk density, with an exponent of 8.25, indicating a behavior highly sensitive to mass density. The energy absorption density and compressibility of sand were determined as a function of axial stress.

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Section: Introductionmentioning

confidence: 99%

Effect of Mass Density on the Compressive Behavior of Dry Sand Under Confinement at High Strain Rates

Luo

Cooper

et al. 2011

Exp Mech

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“…The issue was considered by some users of the SHPB [10,12,13] who concluded that the frequency content of their signals was such that ignoring the non-uniform bar response had a negligible effect on the accuracy of their results. Safford [14] appears to have been the first to propose including a correction for the non-uniform bar response to experimental HPB signals.…”

Section: Distortion Of Hopkinson Pressure Bar Signalsmentioning

confidence: 99%

“…However, while the phase-shift dispersion effect has been widely recognized, the non-uniform bar response aspect of the theory has received surprisingly little attention in subsequent HPB research. The issue was considered by some users of the SHPB [10,12,13] who concluded that the frequency content of their signals was such that ignoring the non-uniform bar response had a negligible effect on the accuracy of their results. Safford [14] appears to have been the first to propose including a correction for the non-uniform bar response to experimental HPB signals.…”

Section: Distortion Of Hopkinson Pressure Bar Signalsmentioning

confidence: 99%

On backward dispersion correction of Hopkinson pressure bar signals

Tyas

Özdemir

2014

Phil. Trans. R. Soc. A.

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Elastic theory shows that wide spectrum signals in the Hopkinson pressure bar suffer two forms of distortion as they propagate from the loaded bar face. These must be accounted for if accurate determination of the impact load is to be possible. The first form of distortion is the well-known phase velocity dispersion effect. The second form, which can be equally deleterious, is the prediction that at high frequencies, the stress and strain generated in the bar varies with radial position on the cross section, even for a uniformly applied loading. We consider the consequences of these effects on our ability to conduct accurate backward dispersion correction of bar signals, that is, to derive the impact face load from the dispersed signal recorded at some other point on the bar. We conclude that there is an upper limit on the frequency for which the distortion effects can be accurately compensated, and that this can significantly affect the accuracy of experimental results. We propose a combination of experimental studies and detailed numerical modelling of the impact event and wave propagation along the bar to gain better understanding of the frequency content of the impact event, and help assess the accuracy of experimental predictions of impact face load.

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“…For many years, the unflagging interest and continuous development in the field of testing the mechanical properties of various building materials subjected to dynamic effects stresses have been noticed [1]. Particularly significant increase in the number of publications in this field concerns metals as well as for concretes [2], polymers, wood and soils [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Indeed, a large part of engineering problems includes research into high-rate strain-stress (HSR) soil response.…”

Section: Introductionmentioning

confidence: 99%

Archives of Civil Engineering

Chmielewski,

Kruszka,

Rekucki

et al. 2021

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The paper includes experimental research using the Split Hopkinson Pressure Bar to determine dynamic compression curves and strength dynamic parameters to depend on the strain rate and moisture for silty sand soil samples.Those experiments are oedometric type based in a rigid confining cylinder. Samples of silty sand with fine a fraction content were taken for the study. To ensure sufficiently uniaxial strain of the tested material, the soil samples were placed in properly prepared casings made of duralumin for the needs of the tests. Thanks to the use of measuring strain gauges on the initiating and transmitting bars, as well as the casing, the nature of the loading pulse was obtained, which was then subjected to the process of filtration and data processing to obtain the nature of the incident, reflected and transmitted wave. During the above dynamic experiments with the representative of silty sand soils, it was observed that its dynamic compaction at a high strain rate is different than in the case of the Proctor test. This is due to higher compaction energy, which additionally changes the grain size by destroying the grains in the structure. The paper presents the results of particle size distribution analysis for two different types of soil samples -this type of analysis is unique. Hence experiments should be further continued for such soils with different granulations and various moisture using, for example, Hopkinson measuring bar technique to confirm for other silty sand soils that are often subgrade of various engineering objects.

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Dynamic High Stress Experiments on Soil

Cited by 43 publications

References 9 publications

Effect of Mass Density on the Compressive Behavior of Dry Sand Under Confinement at High Strain Rates

Effect of Mass Density on the Compressive Behavior of Dry Sand Under Confinement at High Strain Rates

On backward dispersion correction of Hopkinson pressure bar signals

Archives of Civil Engineering

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