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Showing 1 to 20 of 77 for “"Granular media"”.
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Wave propagation in one dimensional confined granular media
Ordered granular media, such as a one dimensional aligned chain of spherical particles, have unique dynamic properties arising from the contact interaction of their individual grain constituents. A primary result of this contact, the formation of solitary waves in dynamically loaded one dimensional …
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Pattern formation in fluid injection into dense granular media
… in the process of fluid injection into dense granular media. The experimental work is conducted with aqueous glycerin solutions, utilizing a novel setup based on a Hele-Shaw cell filled with dense dry sand. The two dimensional nature of the setup allows direct visualization and imaging …
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Design optimization for 2-D granular media with dissipation
We propose an optimization scheme for the tailored dynamic response through a two-dimensional packing of spherical beads. Our goal is to minimize or maximize the reaction force at the desired bead contacts. Two design approaches are presented: introducing interstitial beads and prescribing initial …
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Dynamic Loading of Structures by High Speed Granular Media
This thesis analyses the impact of granular aggregates with structures using experiments and numerical simulations. Original contributions include an insight into multiple factors affecting the loading and damage to the structures, along with study of numerical parameters important for realistic …
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Reversibility, memory formation and collective rotations in dense granular media
Granular matter is a broad term that describes materials comprised of macroscopic grains. Granular material has unique properties that can mimic either a solid- or fluid-like system and has macroscopic behaviors such as segregation, shear- jamming, reversibility, and compaction. The finite size of …
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A Continuum Theory of Soil-Structure Interaction in Granular Media
Made available in DSpace on 2014-12-08T23:56:03Z (GMT). No. of bitstreams: 1 6408349.pdf: 2962930 bytes, checksum: 217c1d0939a029a2c2039d30d84ef14d (MD5) Previous issue date: 1964
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Energy dissipation mechanisms during impact in jammed ductile granular media
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-12-01
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Jamming transition and emergence of fracturing in wet granular media
The interplay between multiphase flow in a granular medium and the displacement of the grain particles generates a wide range of patterns, including fractures, desiccation cracks, and labyrinth structures. There are several controlling parameters behind the morphodynamics that govern the transition …
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Drag coefficients on razor clams in slightly fluidized granular media
Razor clams are able to burrow deeply into granular media with only a small fraction of force required by traditional anchoring devices. It is hypothesized that the collapse of their shell and subsequent localized fluidization of the media is responsible for a large reduction in drag, thereby …
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Micromechanics of Granular Media: A Fundamental Study of Interphase Systems
… a manufactured inclusion that is surrounded by granular soil. These regions are ubiquitous in civil infrastructure and often are components of large-scale composite systems. The interphase region influences load-deformation behavior of the entire composite system. However, mechanisms that …
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Cyclic behavior of cohesionless granular media using the compact state concept
… of compact state, defined as the state that all granular will eventually assume when subjected to large number of stress cycles, is postulated. The proposed constitutive model used in describing the stress-strain characteristics of the soil is the extended CANAsand model: an elasto-plastic …
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Simulation and theoretical study of swimming and resistive forces within granular media
… organism with its environment. Locomotion within granular media like sand, soil, and debris that display both solid and fluid-like behavior in response to stress is less studied than locomotion within fluids or on solid ground. To begin to reveal the secrets of movement in sand, I developed models …
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A hybrid discrete element and continuum method for multiscale granular media modeling
… systems. Scale propagation is a major issue in granular media, wherein two extremes are often taken. In one, granular materials are modeled as a continuum, which greatly reduces the number of degrees of freedom that describe the system and can thus be simulated relatively quickly. However …
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Development of Photoelastic Gelatin Spheres for Force Measurement and Visualization in Granular Media
A new method for measuring forces in granular media experiments using photoelastic gelatin spheres was developed. The photoelastic performance of gelatin spheres based on composition was evaluated and calibration curves were developed. The photoelastic response of the spheres was determined to be …
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Experimental study of the development of plastic solitary waves in one-dimensional granular media
… bar (SHPB) is used to impact one-dimensional granular chain of spheres. These homogeneous chains used here comprise of brass, aluminum, or stainless steel spherical beads, ranging from a single sphere to a chain of fourteen, and are of interest because of their unique wave propagation …
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Model development based on discrete particle simulations of partially- and fully-saturated granular media
Granular materials are ubiquitous in industrial and geophysical scenarios. At a high computational expense, the discrete element method (DEM) simulates granular materials with a high accuracy by tracking individual particles. At the other extreme, empirical formulas based on dimensional analysis …
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Data-efficient learning for manipulation, locomotion, and information gathering involving granular media and deformable objects
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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Study of gas flow dynamics in porous and granular media with laser-polarized ¹²⁹Xe NMR
… (NMR) studies of gas flow dynamics in porous and granular media by using laser-polarized ¹²⁹Xe . Two different physical processes, the gas transport in porous rock cores and the mass exchanges between different phases in fluidized granular systems, were investigated and new experimental methods …
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Modeling the relation between suction, effective stress and shear strength in partially saturated granular media
… the partially saturated mechanical behavior of granular materials, a triaxial test setup was modified to accommodate an MIT Tensiometer as its pedestal. Materials consisting of uniform spherical glass beads were tested, under both saturated and unsaturated conditions, at conditions that matched …
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Photoporomechanics: a new technique to explore grain-scale mechanisms for fluid-driven fractures in granular media
Multiphase flow through granular and porous materials exhibits complex behavior, the understanding of which is critical in many natural and industrial processes like infiltration of water into the vadose zone, water dropout in fuel cells, and geological carbon dioxide storage. While fluid–fluid …
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