Visualizing Kinematics of Dynamic Penetration in Granular Media Using Transparent Soils

Omidvar, Mehdi; Malioche, Jeanne Doreau; Chen, Zhibo; Iskander, Magued; Bless, Stephan

doi:10.1520/gtj20140206

Cited by 40 publications

(3 citation statements)

References 29 publications

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“…For sufficiently slow intrusion, the results are strikingly simple in that the drag force does not exhibit any velocity dependence at all and instead resembles an Archimedean law [7,8]. This quasi-static behavior forms the basis for recent models that predict the resistance to moving through or burrowing into granular material, situations important for animal and robot locomotion as well as for many engineering and geophysical applications [5,[9][10][11][12]. When the intrusion speed is larger, a term is added to account for inertial effects, and the drag force is typically represented by [4,[13][14][15][16][17][18][19][20][21]]…”

mentioning

confidence: 81%

Intrusion into granular media beyond the quasi-static regime

Roth,

Han,

Jaeger

2019

Preprint

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mentioning

confidence: 81%

Intrusion into granular media beyond the quasi-static regime

Roth,

Han,

Jaeger

2019

Preprint

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“…However, the standard method of pluviation can introduce entrapped air into transparent soil, thereby reducing the quality of transparency. Several factors improve the quality of transparent soil samples prepared by means of Advances in Civil Engineering pluviation, such as decreasing the pluviation height and controlling the pluviation rate [32]. ese factors primarily reduce the volume of entrapped air in the transparent soil sample.…”

Section: Sample Preparative Techniques Sample Preparationmentioning

confidence: 99%

An Improved Method for Quantifying Liquid Saturation Using Transparent Soil

Wang

Liu

Chen

et al. 2019

Advances in Civil Engineering

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Transparent porous media combined with digital image processing technology can be used to quantify the saturation of local fluids. In this regard, the calibration relationship between the pixel intensity of the image and the saturation of the wetting liquid is the crucial premise for whether this technique can be promoted and applied, and it is also a bottleneck that limits whether this technique can be rapidly and extensively developed. However, owing to gravity-driven effects, wetting liquid in a residual state usually exhibits an irregular boundary caused by the phenomenon of saturation overshoot, which makes it very difficult to use the previous overflow method to obtain the data pair of saturation-pixel intensity accurately. To this end, we have made some improvements to the specific testing method for wetting liquid saturation in the residual state and proposed a local centrifugal sampling method, which considerably improved the accuracy of this method. The results show that the relationship between the pixel intensity and saturation of the transparent soil obtained through this method is generally consistent with the regularity of the previous calibration method but shows better correlation. The results of this study will drive further potential application of transparent soil in the flow of partially saturated porous media.

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“…Without light reflection and refraction, the entire material presents a transparent state. Some particles or fluid in a certain plane of a transparent soil can be distinguished and photographed by the tracer particle method and laser scattering method [5,6]. Combined with a powerful digital image correlation (DIC) technique, the mechanical behavior of the distinguished parts can be quantitatively analyzed.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Permeability Characteristic of Fused Quartz Sand and Mixed Oil as a Transparent Soil

Huang

Guo

Tang

et al. 2019

Water

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An accurate estimation of soil permeability is essential in geotechnical engineering. Transparent soil provides a promising experimental material to visualize pore-scale fluid flow, although the permeability characteristic of transparent soil remains unclear. As a result of the replacement of the fluid and solid phase, the permeability coefficient of transparent soil is usually several times or even more than ten times smaller than that of natural soil with the same particle size distribution and porosity. Fused quartz sand is used as the solid phase in this proposed transparent soil, which exhibits a similar mechanical behavior but different permeability to those of natural sand. Due to its low cost and eco-friendly characteristic, a mixture of mineral oil and aliphatic hydrocarbon is proposed as the liquid phase, which can achieve the same refractive index as the fused quartz sand after calculating the material proportion. Through a series of laboratory tests, the permeability of the transparent soil is obtained; the permeability is affected by the fluid dynamic viscosity, fluid density, particle size, particle size distribution, void ratio, and pore morphology. A hierarchical approach is introduced to quantitatively evaluate the effect of the particle shape on the permeability. Based on the experimental results, a modified Kozeny–Carman model is proposed for the prediction of transparent soil permeability, which can guide the preparation of transparent soil samples in further experimental studies.

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Visualizing Kinematics of Dynamic Penetration in Granular Media Using Transparent Soils

Cited by 40 publications

References 29 publications

Intrusion into granular media beyond the quasi-static regime

Intrusion into granular media beyond the quasi-static regime

An Improved Method for Quantifying Liquid Saturation Using Transparent Soil

Experimental Study on the Permeability Characteristic of Fused Quartz Sand and Mixed Oil as a Transparent Soil

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