The contribution of frictional contacts to the shear strength of coarse glass bead powders and slurries

Poloski, Adam P.; Bredt, Paul R.; Daniel, Richard C.; Sáez, A. Eduardo

doi:10.1007/s00397-006-0105-3

Cited by 8 publications

(7 citation statements)

References 21 publications

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“…13.5. A discussion on the affects of frictional forces on shear strength was discussed by Poloski et al (2006b).…”

Section: Transient Modelingmentioning

confidence: 99%

Estimate of Hanford Waste Rheology and Settling Behavior

Poloski¹,

Wells²,

Tingey³

et al. 2007

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The actual testing activities were performed and reported separately in referenced documentation. Because of this, many of the required topics below do not apply and are so noted. Test ObjectivesThis section is not applicable. No testing was performed for this investigation. Test ExceptionsThis section is not applicable. No test specification as well as test exception applies to this investigation as there was no testing was performed. Results and Performance Against Success CriteriaThis section is not applicable. No success criteria were established as there was no testing performed for this investigation. Quality RequirementsSince This report is based on data from testing as referenced. The PNNL assumes that the data from these references has been fully reviewed and documented in accordance with the analysts' QA Programs. PNNL only analyzed data from the referenced documentation. At PNNL, the performed calculations, the documentation and reporting of results and conclusions were performed in accordance with the RPP-WTP Quality Assurance Manual (RPP-WTP-QA-003, QAM). Internal verification and validation activities were addressed by conducting an independent technical review of the final data report in accordance with PNNL procedure QA-RPP-WTP-604. This review verifies that the reported results are traceable, that inferences and conclusions are soundly based, and that the reported work satisfies the Test Specification Success Criteria. This review procedure is part of PNNL's RPP-WTP Quality Assurance Manual). Test ConditionsThe scope of the RWG effort is specified in the approved WTP issue response plan (24590-WTP-PL-ENG-06-0013) and defined in subcontractor change notice (SCN) 007 and Test Specification 24590-PTF-TSP-RT-06-007, Rev 0.Demonstrate the simulant properties used for testing bracket expected actual waste properties. For non-cohesive solids (Phase 1) this includes particle size, solids density, solids concentration, liquid density, and liquid viscosity. For cohesive solids (Phase 2) this includes bulk slurry density, particle size, particle density, slurry rheology (such as consistency and yield stress) and shear strength of settled, aged sediments, as well as settled layer (heel) thickness.Waste received at the WTP will be subject to a feed specification supporting plant design and as agreed to in an Interface Control Document. This report compiles the existing Hanford Tank Farm rheological data addressed in italicized text above and establishes expected ranges for these properties for as-retrieved Hanford Tank Farm wastes. Various processes will be performed on these retrieved wastes which are expected to alter these property ranges from the as-retrieved conditions. Simulant development activities should focus on the expected properties of the waste streams under such processing conditions. v Simulant UseThis section is not applicable. No testing was performed for this investigation.

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“…13.5. A discussion on the affects of frictional forces on shear strength was discussed by Poloski et al (2006b).…”

Section: Transient Modelingmentioning

confidence: 99%

Estimate of Hanford Waste Rheology and Settling Behavior

Poloski¹,

Wells²,

Tingey³

et al. 2007

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“…[42] This is followed by a quasi-static flow of larger particle aggregates held together through friction and surface tension. [43][44][45] As shear rate increases, individual smaller particles become fluidized and separate from larger aggregates until collision dominates particle interactions. [44,[46][47][48][49][50] For I << 1, flow is in a quasi-static regime, for I >> 1 flow is in a collisionbased regime, and in between these limits is an intermediate regime where collisions, friction, and capillarity all affect deformation response and microstructure.…”

Section: Resultsmentioning

confidence: 99%

Effects of Shear Rate during Energetic Material Processing on Reactivity

et al. 2019

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Energetic materials are often processed at high rates of deformation as colloidal slurries and then cured. The slurries are non-Newtonian colloidal solutions that exhibit changes in microstructure with variations in applied flow. This study shows that changes to microstructure due to applied flow affect the reactivity of energetic thin films. Energetic thin films of identical composition and geometry are prepared with different applied shear rates, which produce variations in the film microstructure by segregating smaller particles toward surfaces. Results show that films exhibit significant gains in flame speed with increasing shear rate. The differences in flame speed are linked to variations in microstructure. Specifically, densification of smaller particles near a boundary promote increased flame speeds. However, when particles become segregated, larger particles tend to contribute less to the overall reaction because they burn slowly compared to the smaller particles. When segregated, the larger particles may not be adding chemical energy to the reaction front because propagation is dominated by the more ignition sensitive smaller particles. This study demonstrates explicit changes in reactivity arising from changes in processing conditions that affect microstructure. Controlling applied shear rate introduces a new approach to regulating energetic material reactivity when processed using extrusion-based advanced manufacturing techniques.

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“…Under such conditions, and assuming that the solids fraction does not experience significant variations in the z direction, the pressure distribution in the granular material under static conditions follows a Janssen type equation (Poloski et al, 2006;Bertho et al, 2003);…”

Section: Constitutive Modelmentioning

confidence: 99%

“…For granular matter at rest, incipient motion can be achieved only when the applied stress overcomes static frictional contacts and dilates the material so that particles can slide past each other (Nedderman, 1992). Similar to other structured media (e.g., polymeric gels), the transient stress associated with granular failure exhibits an initial linear increase with time (elastic deformation), followed by a stress maximum (failure), beyond which the stress decays asymptotically to an equilibrium value (Poloski et al, 2006;Benarie, 1961). Depending on material confinement, stick-slip phenomena and particle jamming can influence the stress behavior (MiDi, 2004).…”

Section: Introductionmentioning

confidence: 99%