Relevant bibliographies by topics / Shear Rheometry

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Shear Rheometry'

Author: Grafiati
Published: 4 June 2021
Last updated: 15 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Shear Rheometry.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Shear Rheometry"

1

Kohl, Katinka. "Comparison of Dynamic Light Scattering and Rheometrical Methods to Determine the Gel Point of a Radically Polymerized Hydrogel under Mechanical Shear." Micromachines 11, no. 5 (April 28, 2020): 462. http://dx.doi.org/10.3390/mi11050462.

Full text
Abstract:
The phase transition of nanocomposite hydrogels made of N-isopropylacrylamide (NIPAm) and clay (Laponite® XLS) was investigated under mechanical shear influencing the gelation. The hydrogels were synthesized by free radical polymerization. For the processing of cross-linked gels, the phase transition (liquid–solid) and its dependence on mechanical stress are of paramount importance. On the one hand, the determination of the gel point (tg) is possible with rheometry and, on the other hand, with dynamic light scattering (DLS). With rotational rheometry, by identifying the abrupt increase of viscosity, the gel point is evaluated. The DSL is an alternative method to rheometry, to investigate hydrogels under the action of the shear flow, to make results comparable to the rheometric investigations, with and without shear. Experimental parameters were chosen based on preparatory work to obtain comparable results regarding the determination of the gel point of a radically polymerized NIPAm hydrogel.
APA, Harvard, Vancouver, ISO, and other styles
2

Wang, Hong Yun, and Hui Qiang Zheng. "Shear and Squeeze Rheometry of Magnetorheological Fluids." Advanced Materials Research 305 (July 2011): 344–47. http://dx.doi.org/10.4028/www.scientific.net/amr.305.344.

Full text
Abstract:
The mechanical properties of a magnetorheological (MR) fluid in shearing, compression and shearing after compression have been studied in the magnetic field which is generated by a coil carrying different magnitudes of DC electrical current on a self-constructed test system. The relations of compression stress versus compression strain, yield stress versus compression stress were studied under different magnetic fields. The compressing tests showed that the MR fluid is very stiff at small compressive strains lower than 0.13. The shear yield stress of MR fluids after compression was much stronger than that of uncompressed MR fluids under the same magnetic field. The enhanced shear yield stress of MR fluids can be utilized to design the MR clutch and brake for new structure and will make MR fluids technology attractive for many applications.
APA, Harvard, Vancouver, ISO, and other styles
3

Marín-Santibáñez, Benjamín M., José Pérez-González, Lourdes de Vargas, Francisco Rodríguez-González, and Guadalupe Huelsz. "Rheometry−PIV of Shear-Thickening Wormlike Micelles." Langmuir 22, no. 9 (April 2006): 4015–26. http://dx.doi.org/10.1021/la053167k.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Clasen, Christian. "High shear rheometry using hydrodynamic lubrication flows." Journal of Rheology 57, no. 1 (January 2013): 197–221. http://dx.doi.org/10.1122/1.4766364.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Elemsimit, Hamid A., and Dana Grecov. "Utilizing macroscopic rheometry to investigate triglyceride self-assembly." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 232, no. 7 (September 25, 2017): 851–60. http://dx.doi.org/10.1177/1350650117732716.

Full text
Abstract:
The rheological behavior of a canola oil-based bio-lubricant was correlated with its surface activities using a rotary rheometer. The experiments on the gap size, substrate, and surface conditions led to a consistent and conceivable assumption that the self-assembled monolayer was extended to a degree that was sufficient to make a significant change in the bulk properties. In parallel, the thermal behavior was also connected to the surface activities. Differential scanning calorimetry was used to measure what is thought to be the monolayer melting point without using a graphite substrate. Crystallization points were measured at relatively high temperatures. Tribological tests were conducted and explained based on the rheological and thermal findings. A scenario describing both the boundary and bulk regimes was hypothesized. Rheometry and thermal analysis techniques are promising because of the variety of variables that could be controlled, such as temperature, shear, time, gap and substrate. To the best of our knowledge, this is the first study using macroscopic rheology to study the surfactant activities of vegetable oil. The influence of substrate and gap size on rheological behavior could change the current standards for using rotary rheometers.
APA, Harvard, Vancouver, ISO, and other styles
6

Nichetti, Dario. "Oscillating shear capillary rheometry (OSCAR) for polymer melts." Journal of Polymer Engineering 40, no. 9 (October 25, 2020): 737–42. http://dx.doi.org/10.1515/polyeng-2019-0231.

Full text
Abstract:
AbstractKnowing the flow parameters of a polymer melt under steady state condition is required to assess the performance of the material in die and mold design. Often, however, this is not sufficient for a full understanding of the polymer processing behavior, and information on the linear and non-linear viscoelastic behavior is needed. In this paper, the non-linear viscoelastic behavior of a polymer under shear flow has been investigated by measuring the stress response when a cyclic oscillating shear rate in a capillary rheometer is applied. The time-dependent wall shear stress has been decomposed into in-phase viscous and elastic components. A model to interpret the experimental results is presented and applied to a well-characterized polystyrene and two polyethylenes with similar rheology but different molecular structure (HDPE and LLDPE). The relevant characteristics resulting from the model, such as the generalized elastic and viscous modulus under shear, are compared and discussed.
APA, Harvard, Vancouver, ISO, and other styles
7

LODGE, A. S. "LOW-SHEAR-RATE RHEOMETRY AND POLYMER QUALITY CONTROL." Chemical Engineering Communications 32, no. 1-5 (January 1985): 1–60. http://dx.doi.org/10.1080/00986448508911641.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Kelly, A. L., T. Gough, B. R. Whiteside, and P. D. Coates. "High shear strain rate rheometry of polymer melts." Journal of Applied Polymer Science 114, no. 2 (October 15, 2009): 864–73. http://dx.doi.org/10.1002/app.30552.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Wichterle, K., and P. Mitschka. "A novel approach to high shear rate rheometry." Rheologica Acta 25, no. 3 (May 1986): 331–34. http://dx.doi.org/10.1007/bf01357961.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Magnin, A., and J. M. Piau. "Shear rheometry of fluids with a yield stress." Journal of Non-Newtonian Fluid Mechanics 23 (January 1987): 91–106. http://dx.doi.org/10.1016/0377-0257(87)80012-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Shear Rheometry"

1

Kelly, Adrian L. "On-line shear and extensional rheometry of polymer melts in the extrusion process." Thesis, University of Bradford, 1997. http://hdl.handle.net/10454/2796.

Full text
Abstract:
A novel on-line capillary rheometer (OLR) was used to examine the shear and extensional characteristics of polyolefin melts during twin screw extrusion (TSE). Comparisons with off-line rheometry were made using a twin-bore capillary rheometer and a modular in-line slit die rheometer (ILR) provided in-line rheometry comparisons. Both capillary rheometers were controlled via PCs running dedicated software, and the extrusion line and ELR were fully instrumented allowing real-time process monitoring to be carried out by IBM compatible PCs via data acquisition hardware and software. The prototype OLR was developed by the re-design of several key features including an instrumented transfer section and capillary die block which facilitated the use of various die geometries. Shear and extensional on-line rheometry of three polyethylenes (linear and branched), and four molecular weight grades of polypropylene were examined, and a direct comparison with off-line capillary rheometry showed a good correlation. The effect of a high loading of filler on two of the polyethylenes was investigated. In-line shear stress and entry pressure measurements showed a reasonable correlation with on-line rheometry. A study of entry flows in the OLR using capillary dies approaching orifice showed non-linearities occurred at very low capillary length to diameter(L:D) ratios, and this was repeatable using off-line rheometry. Predicted zero length entry pressures (Po) were used to estimate apparent extensional viscosity using a number of standard models. Melt instability and capillary wall slip were also investigated using on-line rheometry. Melt pressure and temperature in the twin screw extruder and OLR were monitored at various process conditions to examine the ability of the OLR to condition melt during testing, and the effect of OLR testing on extrusion conditions. Pressure variation in the extruder, OLR and off-line rheometer were compared in order to quantify process noise. The effect of OLR testing on melt rheology and polymer molecular weight were examined using off-line rheometry and gel permeation chromatography(GPC).
APA, Harvard, Vancouver, ISO, and other styles
2

Sridharan, Harini. "COUPLED DYNAMICS OF HEAT TRANSFER AND FLUID FLOW IN SHEAR RHEOMETRY." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1597346164780318.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Anderson, Fredrik. "Rheological changes at the air-liquid interface and examining different kind of magnetic needles." Thesis, Karlstads universitet, Avdelningen för kemiteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-36540.

Full text
Abstract:
The main objective in this work was to learn how the instrument, the Interfacial Shear Rheometer (ISR400), worked and to investigate how the rheological properties, storage modulus (elasticity), G' and loss modulus (viscous), G'', changes when the surface pressure at the air-liquid interphase changes. The second objective were to examine the different kind of magnetic needles used in the experiments and to conclude which type of needle is best for its specific field of analysis. It was concluded that the relative heavy needle with mass 70.6 mg and length 50 mm was best for systems where the viscous and elastic components are significantly large, where the inertia of the needle is not dominant. It also worked of using the heavier needle for a system of phospholipids. For the hydroxystearic acid (HSA) experiment that were tested on NaCl sub-phase there was a clear improvement after switching from the heavy needle (mass 41.5 mg; length 51 mm) to the relative lighter needle (mass 6.94 mg; length 34.7 mm). The values for the dynamic modulus therefore had a better agreement with reference literature. A spread layer of class II hydrophobins (HFBII) could be compressed to a surface pressure of 46 mNm-1. The G' and G'' values from the frequency sweep were discarded because the monolayer turned into a very viscous-like liquid, and the oscillating needle, after compression, was kind of stuck in the sub-phase and moved very staggering during a frequency sweep. The needle comparison experiment with silica particles 10 wt% Bindzil CC30 (BCC30), at pH 3.5 was done to see if there was any difference in the sensitivity for the needles at the interface which consisted of a pure 10 mM NaCl solution or a 10 mM NaCl solution with BCC30 added to it. The differences were negligible in terms of surface tension but there was a clear difference between the heavy needle and the light needle, when oscillating at higher frequencies (>≈6 rad/s). With this study, the understanding of ISR400 has increased largely. Several issues have been addressed and the results provide a good basis for further studies within the many areas the instrument can be used for. Despite the project's time limit, and the fact that the instrument was new and untested where the project was carried out, focus areas were prioritized so good results could be achieved within reasonable goals.
Huvudmålet med detta arbete var att lära sig hur instrumentet ytskiktsreometern (ISR400) fungerade och undersöka hur de reologiska egenskaperna, elasticitetsmodulen G' och viskositetsmodulen G'', kommer att förändras när det sker en förändring för yttrycket vid gränsskiktet mellan luft och vätska. Det sekundära målet var att undersöka vilken typ av magnetiska nålar som är bäst att använda för respektive gränsskiktssystem. Av att använda den tyngre nålen med massan 70.6 mg och längden 50 mm kunde man dra slutsatsen att den är bäst att använda för system där de viskösa och elastiska komponenterna är signifikant stora, där nålens tröghet inte är dominant. Den fungerade även att mäta med i ett fosfolipidsystem. I experimentet med 12-hydroxy-stearinsyra (HSA) som utfördes på en subfas av NaCl, syntes en klar förbättring efter att byta från en tyngre nål (massa 41.5 mg; längd 51 mm) till en lättare (massa 6.94 mg; längd 34.7 mm). Värdena för dynamiska modulen stämde därför bättre överens med referenslitteraturen. Det utspridda lagret av klass II hydrophobins (HFBII) kunde komprimeras upp till yttrycket 46 mNm-1. Värdena för G' och G'' förkastades därför att monolagret förvandlades till en väldigt viskösliknande vätska, och den oscillerande nålen, efter kompressionen, satt fast i denna tröga vätska och rörde sig väldigt hackigt och oregelbundet under tiden ett frekvenssvep utfördes. Då en jämförelse av olika typer av nålar genomfördes med kiseldioxidpartiklar (10 % (viktsprocent) Bindzil CC30 med pH 3.5), för att se om det är någon skillnad i känslighet för nålarna vid gränssnittet, som bestod av en ren 10 mM NaCl-lösning eller en 10 mM NaCl-lösning med tillsatt BCC30. Skillnaderna var försumbara gällande ytspänningen, men det var en klar skillnad mellan den tunga nålen och den lätta nålen vid oscillering vid höga frekvenser (>≈6 rad/s). I och med detta arbete så har förståelsen för hur ISR400 fungerar förbättrats mycket sedan starten. Flera frågeställningar har behandlats och resultaten ger en bra grund för fortsatta studier inom de många områden som utrustningen kan användas till. Trots projektets tidsbegränsning, och det faktum att instrumentet var nytt och oprövat på platsen där detta arbete utfördes, så prioriterades fokusområden så att goda resultat kunde uppnås inom rimliga mål.
APA, Harvard, Vancouver, ISO, and other styles
4

Gholami, Mohammad. "Shear Induced Migration of Particles in a Yield Stress Fluid." Ohio University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1502793185991791.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Benhadia, Abrehem M. A. "Evaluation of the critical parameters and polymeric coat performance in compressed multiparticulate systems." Thesis, University of Bradford, 2019. http://hdl.handle.net/10454/17459.

Full text
Abstract:
Compression of coated pellets is a practical alternative to capsule filling. The current practice is to add cushioning agents to minimize the stress on the coated pellets. Cushioning agents however add bulkiness and reduce the overall drug loading capacity. In this study, we investigated the performance of compressed coated pellets with no cushioning agent to evaluate the feasibility of predicting the coat behaviour using thermo-mechanical and rheological analysis techniques. Different coating formulations were made of ethyl cellulose (EC) as a coating polymer and two different kinds of additives were incorporated into the polymeric coating solution. Triethyl Citrate (TEC) and Polyethylene glycol 400(PEG400) were used as plasticizers at different levels to the coating formulations (10%, 20%, 30%). Thermal, mechanical and rheological measurements of the coating film formulations were achieved to investigate the effect of plasticizers. Thermal gravimetric analysis results (TGA) showed higher residual moisture content in films plasticised with PEG 400 compared to their TEC counterparts. Differential Scanning Calorimetry (DSC), Dynamic Mechanical Analysis (DMA) and Parallel Plate Shear Rheometer (PPSR) were used to study the influence of the level and type of plasticisers incorporated in coating film formulation on the performance of the coating film. In this study, both DSC and DMA were used to investigate the Tg for each film coating formulation in order to evaluate the effect of the additives. In general DMA results for the Tg value of the films were always higher by 10-20% than those measured by the DSC. Furthermore, clamp size and the frequency of the oscillation have an influence on the evaluation of Tg. Complex viscosity for different coating film formulations revealed that the shear hinning gradient changes with temperature and plasticiser type and concentration. The value of complex viscosity from DMA and PPSR exhibits power law behaviour. The rheological moduli were indirectly affected by the level of plasticiser. There was a discrepancy between the complex viscosity results obtained from both DMA and PPSR at similar temperature but they follow the same trend. The non plasticized polymer showed a 10 time higher complex viscosity values when measured by DMA over that measured by PPSR. The difference was smaller in plasticized films but it was not consistent. Therefore a consistent coefficient to correlate the DMA and PPSR couldn’t be accurately determined Coated pellets were compressed and key process parameters were evaluated. The obtained results revealed that the coating thickness has a significant effect on the release profile of the final products. It was found that by increasing the coating film thickness, the percentage released decreased. Also the compression force has lower influence on the drug release profile, while the dwell time has very low effect on the percentage release from the final products. Optimum release profile was obtained at a coating level of 5.5% w/w and a compression force of 4700N In conclusion, the elasticity of the plasticised EC films in this study meant that the internal stress is not dissipated during compression and the dwell time range that was used in this experiment. Increasing the thickness therefore was necessary to enhance the strength of the film and avoid cracking. The mechanical and rheological profiling was helpful therefore to understand the behaviour of the coated pellets and predict the film properties at various steps of the process of coating and compression (i.e., various shear rate regimes). Experimental design approach to studying the key process and formulation parameters helped identify the optimum values for the process.
APA, Harvard, Vancouver, ISO, and other styles
6

Isreb, Mohammad. "Thermal and rheological approaches for the systematic enhancement of pharmaceutical polymeric coating formulations : effects of additives on glass transition temperature, dynamic mechanical properties and coating performance in aqueous and solvent-free coating process using DSC, shear rheometry, dissolution, light profilometry and dynamic mechanical analysis." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5527.

Full text
Abstract:
Additives, incorporated in film coating formulations, and their process parameters are generally selected using a trial-and-error approach. However, coating problems and defects, especially those associated with aqueous coating systems, indicate the necessity of embracing a quality-by-design approach to identify the optimum coating parameters. In this study, the feasibility of using thermal and rheological measurements to help evaluate and design novel coating formulations has been investigated. Hydroxypropyl methylcellulose acetate succinate (HPMCAS), an enteric coating polymer, was used as the film forming polymer. Differential Scanning Calorimetry (DSC), Dynamic Mechanical Analysis (DMA), and Parallel Plate Shear Rheometery (PPSR) were used to evaluate the effect of different plasticisers on the performance of HPMCAS. The results illustrate that, for identical formulations, the DSC and DMA methods yielded up to 40% differences in glass transition temperature (Tg) values. Moreover, Tg measured using loss modulus signals were always 20-30 oC less than those measured using tan delta results in DMA testing. Absolute and relative Tg values can significantly vary depending on the geometry of the samples, clamp size, temperature ramping rate and the frequency of the oscillations. Complex viscosity data for different formulations demonstrated a variable shear thinning behaviour and a Tg independent ranking. It is, therefore, insufficient to rely purely on Tg values to determine the relative performance of additives. In addition, complex viscosity results, obtained using both the DMA and PPSR techniques at similar temperatures, are shown to be comparable. The results from both techniques were therefore used to produce continuous master curves for the HPMCAS formulations. Additionally, step strain tests showed that HPMCAS chains do not fully III disentangle after 105 seconds as predicted by the Maxwell model. Finally, in situ aqueous-based coating experiments proved that mixtures of triethyl acetyl citrate and acetylated monoglyceride (TEAC/AMG), even without cooling of the suspension, do not cause blocking of the spray nozzle whereas triethyl citrate (TEC) based formulae did. TEAC (alone or in a combination with AMG) exhibits superior wettability to HPMCAS than TEC/AMG formulations and can be used to enhance the efficiency and film quality of the dry coating process.
APA, Harvard, Vancouver, ISO, and other styles
7

Rahman, Mashuqur. "Rheology of cement grout : Ultrasound based in-line measurement technique and grouting design parameters." Doctoral thesis, KTH, Jord- och bergmekanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-176885.

Full text
Abstract:
Grouting is performed in order to decrease the permeability and increase the stiffness of the material, especially soil and rock. For tunnelling and underground constructions, permeation grouting is done where cement based materials are pumped inside drilled boreholes under a constant pressure, higher than the ground water pressure. The aim of permeation grouting is to reduce the water flow into tunnels and caverns and to limit the lowering of the surrounding groundwater table. Cement based materials are commonly used as grout due to their availability and lower costs. To obtain a proper water sealing and reduce the lowering of the ground water table, a desired spread of grout must be achieved and the rheology of the cement grout is the governing factor for estimating the required spread. Rheological properties of cement grout such as viscosity and yield stress are commonly measured off-line using laboratory instruments, and some simple tools are available to make field measurements. Although the rheological properties of the grout that is used play a fundamental role in design and execution, no method has yet been developed to measure these properties in-line in field work. In addition to the real time measurement, there is no standard method for determining the yield stress for grouting applications. Despite the common usage of Bingham model fitting to determine the yield stress, the range of shear rate is often not specified or is neglected.   In this work, an in-line rheometry method combining the Ultrasound Velocity Profiling (UVP) technique with Pressure Difference (PD) measurements, known as “UVP+PD”, was successfully tested for continuous in-line measurements of concentrated micro cement based grouts. A major obstacle of using the ultrasound based methodology was the transducers, which would be capable of emitting sufficient acoustic energy and can be used in field conditions. The transducer technology was developed in a parallel project and the Flow-Viz industrial rheometer was found to be capable of detail measurement of the velocity profiles of cement grout. The shape of the velocity profiles was visualized, and the change in the shape of the profiles with concentration and time was observed. The viscosity and yield stress of the grout were determined using rheological models, e.g. Bingham and Herschel-Bulkley. In addition, rheological properties were determined using the non-model approach (gradient method) and the tube viscometry concept and were compared with results obtained using the rheological models. The UVP+PD method was found to be capable of determining the rheological behavior of cement grout regardless of the rheological model. The yield stress of cement grout was investigated using off-line rheometry techniques and UVP+PD in-line measurements. Tests were performed applying different shear histories and it was found that two ranges of yield stress indeed exist. Therefore, the design value of yield stress should be chosen with respect to the prevailing shear rate at the grout front for the required spread of grout. In addition, an appropriate shear rate range should be used when a Bingham fitting is done to determine the yield stress. In order to estimate the shear rate, plug thickness and velocity for one dimensional and two dimensional geometry, a non- dimensional nomogram was developed. The advantage of using the nomogram is that it does not depend on the applied pressure and the rheological properties of the grout and can therefore, be used as a simple design tool. Analytical approaches were used for the estimation and good agreements were found with numerical calculations and experimental results. In conclusion, in this work, it was found that it is possible to continuously measure the velocity profiles and determine the change of the rheological properties of cement grout using the ultrasound based UVP+PD method under field conditions. The yield stress was also investigated and it was found that two range of yield stress exist depending on the prevailing shear rate of the grout, which should be used for designing the grouting time at different conditions. In order to decide the design value of yield stress for grouting applications, a non-dimensional nomogram was developed that can be used to estimate the plug thickness, shear rate and velocity of the grout.

Funding for the project was provided by the Swedish Rock Engineering Research Foundation (BeFo), The Swedish Research Council (FORMAS) and The Development Fund of the Swedish Construction Industry (SBUF), who are gratefully acknowledged. QC 20151112

APA, Harvard, Vancouver, ISO, and other styles
8

Pértile, Patricia. "Propriedades mecânicas em micro e mesoescala de solos do Rio Grande do Sul." Universidade Federal de Santa Maria, 2015. http://repositorio.ufsm.br/handle/1/3368.

Full text
Abstract:
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Susceptibility to soil degradation is a function of disturbance intensity and structure resistance, which is usually described by mesoscale properties. However, soil mechanical strength in the microscale (micromechanical) evaluated by rheology is not well known. The objective was to evaluate the micromechanical resistance of soils of Rio Grande do Sul through amplitude sweep tests under oscillatory shear, to know the variables that influence this resistance and to evaluate its relationship with physical and mechanical properties in mesoscale. Surface and subsurface horizons of eight soils, Oxisol (4), Ultisol (2), Alfisol (1) and Vertisol (1), were characterized for particle size, mineralogy, chemical, physical and mechanical in micro and mesoscale. The micromechanical resistance of soils was evaluated by rheological curves and parameters, and the influence of water content on rheological parameters was evaluated by regression analysis. The influence of soil composition on rheological parameters and the relationship between rheological parameters and physical and mechanical properties were evaluated by correlation analysis and principal component analysis. There was great variation between soils and horizons according its constitution of particle size, mineralogy and chemistry, where sand, clay, total carbon and presence of 2:1 clay minerals were the most influential factors on rheological behavior of the soils. Soil matric potential also had a strong influence on micromechanics resistance of soils. There were correlations of rheological parameters with physical properties (bulk density and soil porosity), but few correlations with mesomechanical properties (uniaxial compressibility and direct shear). The higher silt and clay content increased the microstructural resistance of the soil, where higher sand content decreased this resistance. The predominance of smectite in clay fraction increased the microstructural elasticity; the increased of kaolinite decreased the elasticity and the increased of iron oxides raised the microstructural stiffness (shear stress) of the soils. Increased water pressure increased micromechanical resistance of most soils due to meniscus force, occurring reduction in micromechanics stiffness at 10 kPa pressure due to presence of pseudosand associated with low bulk density. The increase of carbon content increased soil elasticity, but decreased soil rigidity; and cations content correlated only indirectly with rheological parameters. The larger correlation between rheological parameters and physical properties is probably due to aggregation factors being the same in both scales, such as particle size, mineralogy and their interactions. On the other hand, the low relation of soil mechanical resistance in micro and mesoscale seem influenced by different factors related to soil composition and structure.
A suscetibilidade do solo à degradação é função da intensidade da perturbação e da resistência da estrutura, a qual é normalmente descrita por propriedades em mesoescala. Entretanto, a resistência mecânica do solo em microescala (micromecânica) avaliada por meio da reologia é pouco conhecida. O objetivo foi avaliar a resistência micromecânica de solos do Rio Grande do Sul com o uso de testes de varredura de amplitude por cisalhamento oscilatório, conhecer as variáveis que influenciam essa resistência e avaliar sua relação com propriedades físicas e mecânicas em mesoescala. Os horizontes superficial e subsuperficial de oito solos das ordens Latossolo (4), Argissolo (2), Planossolo (1) e Vertissolo (1) foram caracterizados quanto à granulometria, mineralogia, propriedades químicas, físicas e mecânicas em micro e mesoescala. A resistência micromecânica dos solos foi avaliada por curvas e parâmetros reológicos e a influência do conteúdo de água sobre parâmetros reológicos foi avaliada por análise de regressão. A influência da composição do solo nos parâmetros reológicos e a relação entre parâmetros reológicos e propriedades físicas e mesomecânicas foram avaliadas por análise de correlação e análise de componentes principais. Houve grande variação entre os solos e horizontes quanto à sua constituição granulométrica, mineralógica e química, sendo areia, argila, carbono e presença de argilominerais 2:1 os fatores que mais influenciaram o comportamento reológico dos solos. A tensão de água também teve forte influência na resistência micromecânica dos solos. Foram verificadas correlações de parâmetros reológicos com propriedades físicas (densidade e porosidade do solo), mas poucas correlações com propriedades mesomecânicas (compressibilidade uniaxial e cisalhamento direto). O aumento dos teores de silte e argila aumentou a resistência micromecânica do solo, enquanto maiores teores de areia diminuíram essa resistência. O predomínio de esmectita na fração argila aumentou a elasticidade microestrutural; a caulinita diminuiu a elasticidade; e o aumento de óxidos de ferro aumentou a rigidez (tensão de cisalhamento) microestrutural dos solos. O aumento da drenagem aumentou a resistência micromecânica da maioria dos solos devido ao aumento das forças de meniscos, ocorrendo redução da rigidez micromecânica na tensão de água de 10 kPa em horizontes com presença de pseudoareia associada com baixa densidade do solo. O incremento dos teores de carbono aumentou a elasticidade do solo, mas diminuiu sua rigidez; e os teores de cátions correlacionaram-se indiretamente com parâmetros reológicos. A maior relação entre parâmetros reológicos e propriedades físicas decorre, provavelmente, dos fatores de agregação serem os mesmos em ambas as escalas, como a granulometria, a mineralogia e suas interações. Por outro lado, a relação da resistência mecânica do solo em micro e mesoescala foi pequena, pois parecem influenciadas por diferentes fatores relacionados à composição e estrutura do solo.
APA, Harvard, Vancouver, ISO, and other styles
9

Giacomin, A. Jeffrey. "A sliding plate melt rheometer incorporating a shear stress transducer /." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=76525.

Full text
Abstract:
In currently used shear rheometers, shear stress is inferred from a measurement of either total force or total torque. These methods are subject to experimental errors due to uncontrolled flow at the sample boundaries. Such errors can be avoided by measuring the shear stress locally, in the region of controllable flow, using a shear stress transducer. A new sliding plate rheometer for molten plastics has been developed to incorporate a recently developed shear stress transducer. The rheometer operates at temperatures up to 250$ sp circ$C. Static and dynamic calibrations showed that the shear stress transducer sensitivity is stable and that its frequency response is suitable for the study of molten plastics. This rheometer was equipped with a computer controlled servohydraulic linear actuator, which provided wide flexibility in shear history selection. Digital data acquisition and signal processing enabled the use of the discrete Fourier transform for nonlinear viscoelastic property determination. Important differences were observed between the locally measured shear stress and values inferred from total force in both large amplitude oscillatory shear and in reciprocating exponential shear tests. For these property measurements, free boundary errors can dominate the dynamics of total force measurements.
APA, Harvard, Vancouver, ISO, and other styles
10

Walker, Alasdair Michael. "Extrusion processing of chocolate crumb paste." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:1c54a2e6-a767-4fd3-8bf0-e2d250b7ac4a.

Full text
Abstract:
This project considers the co-rotating twin screw extrusion of a confectionery paste comprising powdered proteins, sugars, water and fats. As is the case with many food industry products, this process has been developed experimentally with little quantitative understanding of how variations in processing conditions influence the formation of the extrudate. A variety of techniques have therefore been developed to characterise and quantify the dispersive mixing, distributive mixing and rheological flow properties of this complex, multiphase, viscoelastic, unstable material. These techniques have then been utilised in a pilot plant extruder study of the mechanics of mixing and paste formation during extrusion, considering the influence of both processing conditions and screw profile. The internal evolution of paste microstructure has been successfully tracked along the length of screw profile using dead-stop extractions of the screws. A rigorous off-line assessment of shear yield strength behaviour using cone penetrometry has shown the use of conventional off-line rheometers to be unviable due to rapid post extrusion hardening. This highlighted the need for an in-line rheological measurement technique for continuous extrusion analysis where the extruded material is severely time dependent and not extractable. In pursuit of this, a novel arrangement of bender elements is proposed and trialled, to rapidly characterise material parameters of viscoelastic pastes. A second technique looking to extend the application of shear wave interface reflection to multiphase pastes is also trialled. A novel analysis of thermogravimetric data (TGA) has generated a viable index of distributive mixing, suitable for use on complex multi-component materials where thermal decomposition temperatures of the components are not well defined. Quantitative image analysis of pastes using scanning electron microscopy (SEM), optical microscopy protein staining and a novel application of multiphoton microscopy (MPM) have been used to visualise paste microstructure and quantify dispersive mixing. From the pilot plant extruder study, the application of these techniques was successful in mapping the evolution of paste mixing and the resulting microstructure, as well as identifying key differences between pastes mixed by twin screw extrusion and batch mixing.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Shear Rheometry"

1

Varma, Mohan. "High Shear Rheometry of Unsymmetrical Dimethylhydrazine Gel." In Chemical Rocket Propulsion, 519–42. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27748-6_21.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Barrès, Claire, and Jean L. Leblanc. "Shear Rheometry of Uncured Rubber Compounds using a Sliding Cylinder Rheometer." In Progress and Trends in Rheology V, 453–54. Heidelberg: Steinkopff, 1998. http://dx.doi.org/10.1007/978-3-642-51062-5_219.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

James, A. E., D. J. A. Williams, and P. R. Williams. "Small Strain, Low Shear Rate Rheometry of Cohesive Sediments." In Physical Processes in Estuaries, 488–500. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73691-9_24.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Ouriev, Boris. "Rheology and Rheometry of Aluminum Alloys: Influence of Shear and Vibration on Aluminum Flow Properties." In Solid State Phenomena, 558–64. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908451-26-4.558.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Dinser, Sandro, Klaus Haeusler, and Jürg Dual. "Novel Rheometer for Superposed Constant and Oscillatory Shear Rate." In The Mechanical Behavior of Materials X, 1605–8. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-440-5.1605.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Talbi-Boucenna, I., and D. Quemada. "A New Method of Standardization of Unsteady Measurements Applied to a Shear Rate Controlled Rheometer." In Progress and Trends in Rheology V, 499–500. Heidelberg: Steinkopff, 1998. http://dx.doi.org/10.1007/978-3-642-51062-5_242.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Almutairi, Haya, Dandi Zhao, and Hassan Baaj. "Investigating Fatigue Characteristics of Asphalt Binder Modified with Phase Change Materials Using Dynamic Shear Rheometer." In RILEM Bookseries, 1143–49. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-46455-4_145.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Buannic, M., H. Di Benedetto, C. Ruot, T. Gallet, and C. Sauzéat. "Fatigue Investigation of Mastics and Bitumens Using Annular Shear Rheometer Prototype Equipped with Wave Propagation System." In 7th RILEM International Conference on Cracking in Pavements, 805–14. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-4566-7_78.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Baumert, Christian, and Harald Garrecht. "About the Influence of Shear-Induced Particle Migration and Sedimentation on the Measurement Results of Concrete Rheometers." In RILEM Bookseries, 168–73. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22566-7_20.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Coussot, Philippe. "Shear rheometry with concentrated suspensions." In Mudflow Rheology and Dynamics, 69–92. Routledge, 2017. http://dx.doi.org/10.1201/9780203746349-4.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Shear Rheometry"

1

Broboana, Diana, Cristina Sorana Ionescu, and Corneliu Balan. "Numerical Modeling of Shear Banding Formation in Rheometry." In 2019 11th International Symposium on Advanced Topics in Electrical Engineering (ATEE). IEEE, 2019. http://dx.doi.org/10.1109/atee.2019.8724875.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

"Deconvolution for oscillatory shear rheometry using the Landweber iteration." In 23rd International Congress on Modelling and Simulation (MODSIM2019). Modelling and Simulation Society of Australia and New Zealand, 2019. http://dx.doi.org/10.36334/modsim.2019.a3.anderssen.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Souza Mendes, Paulo R., Jose´ R. R. Siffert, and Eduardo S. S. Dutra. "Apparent Wall Slip in Capillary Rheometry of Viscoplastic Liquids." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79525.

Full text
Abstract:
We employ a recently proposed viscosity function (Souza Mendes and Dutra, 2004) to analyze the fully developed flow of yield-stress liquids through tubes. We first show that its dimensionless form gives rise to the so-called jump number, a novel material property that measures the shear rate jump that the material undergoes as the yield stress is reached. We integrate numerically the momentum conservation equation that governs this flow together with the generalized Newtonian Liquid model and the above mentioned viscosity function. We obtain velocity and viscosity profiles for the entire range of the jump number. We show that the friction factor f.Re curves display sharp peaks as the shear stress value at the tube wall approaches the yield stress. Finally, we demonstrate the existence of sharp flow rate increases (or apparent slip) as the wall shear stress is increased in the vicinity of the yield stress.
APA, Harvard, Vancouver, ISO, and other styles
4

Day, Michael, Rowan-Louise Blanchard, Rob English, Tom Dobbie, Rachel Williams, Michael Garvey, David Wong, et al. "Shear and Extensional Rheometry of PDMS Tamponade Agents Used in Vitroretinal Surgery." In THE XV INTERNATIONAL CONGRESS ON RHEOLOGY: The Society of Rheology 80th Annual Meeting. AIP, 2008. http://dx.doi.org/10.1063/1.2964592.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Cirka, H., W. Farr, S. Koehler, and K. Billiar. "Extending Standard Rotational Rheometry for Small, Irregular, Anisotropic Tissues and Gels." In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53678.

Full text
Abstract:
Quantification of the viscoelastic properties of soft tissues and protein gels is vital to the understanding of normal tissue development and disease progression and for evaluating the cell-mediated remodeling of fibrous protein-based engineered tissues (e.g., collagen, fibrin). Rotational (shear) rheometers are theoretically well suited for characterizing the storage and loss modulus of such soft gels; however, standard “geometries” used in such devices require relatively large, homogeneous samples to generate sufficient torque for accurate analysis of very soft materials, and the analysis generally assumes linear isotropic viscoelastic behavior. Newly formed tissues and biological protein gels such as blood clots are often small, soft (low stiffness), irregularly shaped, anisotropic, and difficult to handle. The aim of this work is to develop a method that will allow the accurate characterization of small, irregular protein gels utilizing an industry-standard rheometer.
APA, Harvard, Vancouver, ISO, and other styles
6

Evans, P. Adrian, Karl M. Hawkins, Matthew J. Lawrence, P. Rhodri Williams, Rhodri L. Williams, Albert Co, Gary L. Leal, Ralph H. Colby, and A. Jeffrey Giacomin. "Rheometrical Studies of Blood Clot Formation by Oscillatory Shear, Thromboelastography, Sonoclot Analysis and Free Oscillation Rheometry." In THE XV INTERNATIONAL CONGRESS ON RHEOLOGY: The Society of Rheology 80th Annual Meeting. AIP, 2008. http://dx.doi.org/10.1063/1.2964777.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Lalko, Michael P., Leela Rakesh, and Stanley Hirschi. "Rheological Study of Steady Shear and Linear Viscoelastic Characteristics of Polyethylene and Polycarbonate Nanocomposites." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43489.

Full text
Abstract:
The addition of nano-sized particles into a polymer matrix is an excellent way to manipulate polymer properties. Our current efforts try to understand how a material’s properties are influenced by parameters such as temperature, particle size, and particle concentrations of additives. This paper presents the rheological behavior of polycarbonate (PC) and low density polyethylene (LDPE) containing at least 2.5% and 5% weight fractions of functionalized and un-functionalized carbon nanotubes (CNTs). These materials were investigated using steady shear and oscillatory rheometry over a range of processing temperatures. The properties examined through rheological experimentation include: viscosity, critical strain, storage modulus (G′), and loss modulus (G ). The nanocomposites samples were examined using scanning electron microscopy (SEM) and UV light microscopy.
APA, Harvard, Vancouver, ISO, and other styles
8

Andertova´, Jana, and Frantisˇek Rieger. "Rheology and Rotational Rheometry of Concentrated Clay Based Ceramic Suspensions: Steps From Measured to Relevant Data." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-38487.

Full text
Abstract:
The rheological behavior of ceramic suspensions affects significantly wet ceramic processing. On the base of knowledge of rheological parameters the technological parameters of various processes (mixing, batching, spray drying, slip casting, of rheological parameters the selection of proper geometry and sensors must be done. From the data measured the flow curves must be designed and parameters of appropriate rheological models must be calculated. The power-law is the simplest model mostly used for description of rheological behavior of non-Newtonian fluids. Using this model, the dependence of shear stress on shear rate can be expressed. The aim of this paper is to show how the flow curves necessary for parameters of rheological model evaluation can be obtained from primary experimental data received from measurements on rotational viscometer. The two arrangements of rotational viscometer method were used in rheological measurements. The procedure of experimental data to obtain parameters K (coefficient of consistency) and n (flow behavior index) is presented.
APA, Harvard, Vancouver, ISO, and other styles
9

Miguel, Bernal, Jean-Luc Gennisson, Mathias Fink, Mickael Tanter, and Patrice Flaud. "Cross validation of Supersonic Shear Wave Imaging (SSI) with classical rheometry during blood coagulation over a very large bandwidth." In 2013 IEEE International Ultrasonics Symposium (IUS). IEEE, 2013. http://dx.doi.org/10.1109/ultsym.2013.0452.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Ahmadzadegan, Arash, Anil Saigal, and Michael A. Zimmerman. "Numerical and Experimental Measurements of Die Swell for a LCP and an Amorphous Polymer." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63723.

Full text
Abstract:
It is known that liquid crystalline polymer (LCP) melts have a high elasticity which can be measured from its effect on the rheology on the cessation of shear. On the other hand, LCPs show very limited die swell after extrusion. In this paper, the results of experimental measurements of the die swell for a liquid crystalline material and polypropylene (PP), an amorphous polymer, are presented. The extrudate thickness 5 cm below the die lip is optically measured and the results are analyzed using ImageJ software. A numerical simulation of the die swell based on the capillary rheometry data and oscillatory rheometry is performed for LCP materials using ANSYS ® POLYFLOW ®. Different viscoelastic properties are used to model the LCP and optimum properties to model the die swell for the base volume flow rate are determined. Results show similarity between die swell modeling for the LCP at the base volume flow rate but increasing the die swell results in some deviation from the experimental results.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Shear Rheometry"

1

Lodge, Arthur S. High Shear Rate Rheometry of Low-Viscosity Liquids. Fort Belvoir, VA: Defense Technical Information Center, November 1987. http://dx.doi.org/10.21236/ada188447.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Shear Rheometry' for particular source types:
Journal articles Dissertations / Theses
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography