Дисертації з теми "Shear thickening fluids"
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Sadrizadeh, Sasan. "Instabilities in Pulsating Pipe Flow of Shear-Thinning and Shear-Thickening Fluids." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-82037.
Повний текст джерелаZhu, Weijie Kelvin. "Numerical analysis of shear thickening fluids for blast mitigation applications." Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/10717.
Повний текст джерелаTabassum, Maisha. "Mechanical and Energy-Absorbing Properties of Shear-Thickening Fluids (STFs)." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/16856.
Повний текст джерелаShah, Ashish, and ashishshah7@yahoo co in. "Rheology of Shear Thickening Mineral Slurries." RMIT University. Civil, Environmental and Chemical Engineering, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080725.133946.
Повний текст джерелаMadraki, Fatemeh. "Shear Thickening in Non-Brownian Suspensions." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1584354185678102.
Повний текст джерелаHasib, Mohammad Tarik. "Vibration Control of Sandwich Beams by Integration of Shear Thickening Fluid." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/13520.
Повний текст джерелаXu, Yue. "Stabbing resistance of soft ballistic body armour impregnated with shear thickening fluid." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/stabbing-resistance-of-soft-ballistic-body-armour-impregnated-with-shear-thickening-fluid(c5e8d517-6d46-4049-960c-383b10245800).html.
Повний текст джерелаCui, Xiaoyu. "Drop-weight Impact Behaviour of a Shear Thickening Fluid in a Finite Volume." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/25941.
Повний текст джерелаRamirez, Jose G. (Jose Guadalupe) 1980. "Characterization of shear-thickening fluid-filled foam systems for use in energy absorption devices." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/32777.
Повний текст джерелаIncludes bibliographical references (leaf 44).
The absorption of energy during impacts is ubiquitous in society. From our car seats to body armor, the ability to divert or dissipate unwanted energy is an aspect that has many engineering challenges. One approach to this issue is the use of fluid-filled elastomeric foams. In the present thesis, the fluid within these foams is a non-Newtonian shear-thickening fluid composed of 300 nm silica particles suspended in a solvent, ethylene glycol, at high concentrations, 45-55 %. The field of energy absorption using elastomeric foams has been extensively researched in industry. In addition, the effects and mechanism driving shear-thickening fluids (STF's) has also been well studied in industries involving particle suspensions, such as paints and medical applications. This research intends to combine the analysis of these two systems in an effort to characterize advanced energy absorption mechanism. It was found that the primary factors dominating fluid filled foams containing this STF are the volume fractions and compressional strain rate. In addition, the energy absorption capability of these foams has been compared to that of 'dry' foams and Newtonian-fluid filled foams, and has demonstrated an increase in energy absorption capabilities.
by Jose G. Ramirez.
S.B.
Cheng, Jialun. "Striker Shape Effect on Low-velocity Impact Energy Absorption of a Shear Thickening Fluid." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/22694.
Повний текст джерелаMandal, Anirban. "Computational Modeling of Non-Newtonian Fluid Flow in Simplex Atomizer." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1202997834.
Повний текст джерелаAnderson, Brian. "Development of a non-Newtonian latching device." Thesis, Manhattan, Kan. : Kansas State University, 2010. http://hdl.handle.net/2097/3855.
Повний текст джерелаLiard, Maxime. "Suspension concentrées : systèmes non newtoniens et thixotropie sous écoulement." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAE039/document.
Повний текст джерелаThis thesis has been done in collaboration with the company SIKA, one of the leader if the construction industry. This thesis report is organized in three chapters where each of them tries to answer a problem coming from industrial processes. In the first chapter, we studied the impact of particles concentration on the flowing properties of complex fluids such as shear-thinning and shear-thickening fluids. We demonstrated the importance of local contacts between particles to explain the evolution of the viscosity with the volume fraction. In the second chapter, we studied the aggregation of colloidal attractive suspensions under small perturbations and proved the existence of a maximum of elastic modulus during the rebuilding of the structure. Finally, the third chapter is a study of a phase diagram of a concentrated suspension jets. In the diluted and semi-diluted regimes, we found results in agreement with the bibliography, meanwhile at very high concentration, we studied a new regime where the jet, unstable, is oscillating. We showed those oscillations can be explained by the shear-thickening behaviour of the suspensions at those high concentrations
Wone, Michel. "Rhéologie des suspensions non Browniennes concentrées : une étude numérique." Thesis, Paris Est, 2015. http://www.theses.fr/2015PEST1070/document.
Повний текст джерелаSuspensions of rigid grains in a fluid constitute a class of complex fluids that present a rich rheology. Even simpler cases of non-Brownian, non-colloidal spherical grains suspended in a Newtonian fluid feature macroscopic behaviours that are still not completely understood, especially when the concentration of particles is high. In these materials, the complexity of the dynamic is the result of the subtle balance that occurs between hydrodynamic interactions mediated by the interstitial fluid, and contact forces between grains. In this work, we tackle those questions from the point of view of discrete numerical simulations, in the context of the simple shear of 2D concentrated suspensions. Hydrodynamic interactions are modelled by pair lubrication, coupled with a possibly frictional contact law. Grains inertia is not neglected. We have access to the whole stress tensor, allowing the measure of pressure, shear stress, and normal stress difference, as well as their associated viscosities. The study of constant volume simple shear shows the existence of a shear-thickening transition between a viscous regime at low shear rate (stress proportional to the shear rate) and an inertial regime at high shear rate (stress proportional to the shear rate squared), depending on whether the stress is dominated by lubrication interactions or grains inertia. The position of the measured transition shear rate is consistent with a scaling argument for the stress that takes its divergence with concentration into account. Constant pressure simple shear simulations then let us explore the behaviour of very concentrated suspensions (up to 1% to the theoretical jamming fraction) in their viscous flow domain. We show that the rheology of the mix can then be described by a flow law that is only function of the viscous number, constructed as the ratio of a typical time for the local rearrangement of grains subjected to viscous forces, and a convection time consistent with the imposed flow. This allows a precise characterization of the divergence of stress with particles concentration. At last, we measure the stationary microstructure that develops within the flow. We show an important anisotropy of contacts, and discuss the evolution of this distribution with the concentration of the suspension
Landazuri, Gomez Gabriel. "Les études de la dynamique du système micellaire P103/Eau et système de rhéoépaississement CTA-n-Fluorobenzoato." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00955891.
Повний текст джерелаYan, Rui-Liang, and 顏瑞良. "Shear thickening fluids applied to the study of liquid armor." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/80836172599145133408.
Повний текст джерела國防大學中正理工學院
應用化學碩士班
99
Shear thickening fluid (STF) has found its applications in protective materials recently. Generally, the STF consists of colloidal silica particles, their average size being about 450nm, being dispersed in a liquid solvent. However, the particle size of the particles has tremendous influence on the rheological behavior of the suspension. Therefore, in this study, shear thickening behaviors of nano silica , submicron silica and carbon nanotubes dispersions in ethylene glycerol (EG) and polyethylene glycol (PEG) have been studied with rheometer. The dispersion stabilities, thermal characteristics and rheological behaviors of silica suspensions were studied to elucidate the effects of particle size and solid content. This paper also presents an experimental research regarding the ballistic performance of STF-containing Kevlar fabrics and UHDPE. STF shows its potential in many possible civilian applications, such as protective equipment, motorcycle clothing and damping material. The study, shear thickening behaviour and dispersions in room temperature vulcanized (RTV) and Shear thickening fluid have been studied with foam. The dispersion stabilities, thermal characteristics and rheological behaviors of silica suspensions were studied to elucidate the effects of particle size and solid content. This paper also presents an experimental research regarding the impact test performance of STF-RTV composite materials. STF-RTV composite materials shows its potential in many possible civilian applications, such as protective equipment, motorcycle clothing and damping material.
Lin, Jhih-Jhang, and 林志璋. "Study of Impact Resistance of Composites Containing Shear Thickening Fluid." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/3vfnxc.
Повний текст джерела國立臺北科技大學
化學工程研究所
101
In this study, shear thickening fluid was prepared by two methods. Polyethylene glycol was used as the fluid and silicon dioxide nanoparticles of two different sizes were used as the colloid. From the results, we observed that the mixtures of high loading level of silica nanoparticles with polyethylene glycol demonstrated significant shear thickening behavior. For the PEG fluid containing 40 wt% 15 nm silicon dioxide nanoparticles, the viscosity of fluid instantly increased 29 to 30 times when shear rate increased from 5/s to 28.9/s. Also, for the PEG fluid containing 72.93 wt%, 450 nm silicon dioxide nanoparticles, the viscosity of fluid instantly increased 7 to 9 times when shear rate increased from 61.1/s to 217/s. One of the applications of STF is protection. Impregnating Kevlar fabrics with shear thickening fluid into Kevlar fabric may significantly reduce the layers of Kevlar fabric needed for ballistic impact resistance and improve the flexibility of the composite. In this study, ballistic testing samples were prepared from neat Kevlar fabrics and STF-impregnated ones using Kevlar fabrics with various amount of shear thickening fluid. The result shows that samples reinforced with STF showed a significant improvement in bullet energy absorption.
Chen, Yao-Chun, and 陳堯鈞. "Preparation and Properties of multi-layer Kevlar / Shear Thickening Fluid Composites." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/n9543p.
Повний текст джерела國立臺灣科技大學
材料科學與工程系
104
This study reports a “scale up process” of shear thickening fluid (STF). The 40 wt% STF / Kevlar composite was manufactured by two different process. One is impregnating Kevlar fabrics with STF. The other method uses “mangle machine” padding the STF into Kevlar fabrics. The air gun impact test result of the impregnating method showed that STF impregnating with 2 layers Kevlar K129 can significantly increase EDP by 31%. The air gun impact test results of the “mangle machine” method prepared composite is similar with the sample prepared by the impregnating method. However, stab test results showed that sample prepared by the mangle method showed a better resistance than the sample prepared by the impregnating method. The ballistic impact, drop tower, and flexibility tests were conducted. To determine the performance of 30 layers Kevlar without coating STF and the 20 layers STF/Kevlar coated with STF and made by the “mangle machine” method. The result of ballistic impact tests showed both 20 layers STF/Kevlar and 30 layers Kevlar were of the same protection level. They both meet the requirement of NIJ 0101.04-II protection standard. The thickness of 20 layers STF/Kevlar composites were 70% of 30 layers Kevlar. The flexibility tests showed that 20 layers STF/Kevlar composites possesses better flexibility than 30 layers Kevlar. The drop tower test indicated that the 20 layers STF/Kevlar showed similar protective effect as 30 layers Kevlar. The ballistic impact test also showed similar results. Adding STF made the composites lighter and more flexible than conventional Kevlar.
Shen, Ching, and 沈情. "Synthesis of Core-Shell Nanoparticles and Its Application as Shear Thickening Fluid." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/fz42aa.
Повний текст джерела國立臺北科技大學
化學工程研究所
102
Shear thickening fluid, a type of non-Newtonian fluid, changes viscosity based on shear rate. It has low viscosity at low shear rates, and high viscosity at high shear rates. Thus, this fluid stays mobile under normal conditions, but swiftly hardens upon high-speed impact, resulting in a material useful in liquid armor. So far, most studies have focused on silica-based material as the primary particles in shear thickening fluids, but they often show limited resistance to puncturing. Herein, an approach to synthesize core-shell (alumina/silica) nanoparticles, which can be used as the dispersed phase in the liquid armor materials. Notably, the combination of alumina and silica materials shows significant advantage for enhancing the protective properties of the liquid armor. The core-shell nanoparticles in this study were synthesized using a sol-gel process wherein the silica shell was grown on alumina nanoparticles via a condensation reaction with TEOS. Subsequently, characterization was performed through dynamic light scattering, TEM, and zeta potential measurements. Rheometer measurements were also made using the as-synthesized nanoparticles (treated via sonication) dispersed in a polyethylene glycol medium with varying volume fractions. Thus, the rheological properties of the core-shell system could be investigated and the shear thickening phenomenon observed at high shear rates. Finally, the application of alumina/silica core-shell nanoparticles in liquid armor and the optimization of their comprehensive feasibility and rheological properties are discussed.
CHEN, YING-JU, and 陳盈儒. "Research of the Protective Materials Containing Shear- thickening-fluid with Graphene Composites." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/95389444518702825488.
Повний текст джерела國防大學理工學院
化學工程碩士班
104
Shear thickening fluid (STF) is a colloidal suspension of solid particles suspended in fluid and exhibits the shear thickening phenomenon resulting in large, sometimes discontinuous increase in viscosity above a critical shear rate. This particular rheological property of STFs can be utilized to improve their impact resistance and can be used in many protective applications. However, the impact resistance and threats including puncture, stab and 9 mm bullet impacts (muzzle velocity of 350 ± 10 m/s) varies from the low velocity range to high velocity range. Therefore, the effect of the magnitude of critical shear rate on impact performance is investigated in this research. The critical shear rate of STF is adjusted by varying the size and content of silica particles as well as the solvent composition. In addition, the graphene is also added into STFs to change their rheological property which in turn changing their protective properties. The results of this research can aid in the development of a broad range of protective materials for both consumer and military applications.
Chien, Shih-Shun, and 簡士勛. "Synthesis of Alumina and Core-Shell Nanoparticles and Their Application as Shear Thickening Fluid." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/08424170518396013973.
Повний текст джерела國立臺灣大學
化學工程學研究所
101
Abstract Shear thickening fluid, so called STF, which has a special rheological behavior of the fluid. When suddenly exposed to external shocks, it rapidly presented like a solid which has hardness of properties in a short time (about a few milliseconds). Army Research Laboratory (ARL) first developed shear thickening fluid for military. They researched based on the Kevlar fibers, which was immersed the shear thickening fluid which consists silica nanoparticles and polyethylene glycol mixing, and they called it liquid armor. This shear thickening fluid can greatly enhance the application of Kevlar fiber strength and impact resistance. So far, study of shear thickening fluid based on nano silica particles is now quite mature, the tests on STF-Kevlar fiber containing the liquid armor by spikes, razor, needle, and low-speed bullet attack presented in much effective impact on defense capabilities in general Kevlar fiber. This result makes shear thickening fluid earn greatly in the military''s attention. There are many capable STF research direction currently, so our major research is core-shell (polystyrene / silica) and alumina, which can replace silica nanoparticles as a new dispersed phase and then disperse in polyethylene glycol alcohol. Finally, we use rheometer to test their rheological behavior, exploring the future of this shear thickening fluid.
Lanzendörfer, Martin. "Proudění nestlačitelných tekutin s viskozitou závislou na tlaku (a jejich aplikace při modelování proudění v ložisku)." Doctoral thesis, 2011. http://www.nusl.cz/ntk/nusl-311374.
Повний текст джерелаRabb, Robert James 1966. "A mesomechanical particle-element model of impact dynamics in neat and shear thickening fluid kevlar." Thesis, 2007. http://hdl.handle.net/2152/3268.
Повний текст джерелаtext
ZHENG, MING ZHE, and 鄭明哲. "The Study on Anti-stab Property of Fabric with Kevlar/Shear Thickening Fluid/ Graphene Oxide." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/222q6m.
Повний текст джерела逢甲大學
纖維與複合材料學系
105
In order to reduce the number of layers of Kevlar fabric effectively and to improve the mobility of personnel, we used colloidal silica dispersed in polyethylene glycol to prepare shear thickening fluid that was used in protective armor with effective protective properties. The addition of graphene oxide was discussed in this paper to investigate its impact on the effect of shear fluid properties. In this study, we investigated the puncture test, falling weight impact test, rheological test and torsion test of colloidal silica in different molecular weight of polyethylene glycol (PEG) impregnated Kevlar KK10 fabric. The falling weight impact test was carried out by using blunt-nosed bullet (9 mm) and pointed bullet (7.62 mm), and hope the test results can be applied to the anti-bullet protection. The experimental results showed that the fabric impregnated with PEG molecular weight of 200 and 60 wt% of colloidal silica had better puncture resistance than that of non-impregnated fabric by 414%. In the falling weight impact test with blunt-nosed bullet, the absorption energy of the impregnated fabric was increased by 66.87%; whereas the absorption energy of the impregnated fabric with pointed bullet was increased by 126.11%. The addition of graphene oxide impacted on the shear thickening phenomenon, and enhanced the anti-puncture property of PEG with molecule weight of 600; however, it decreased that of PEG with molecule weight of 200.
Rabb, Robert James. "A mesomechanical particle-element model of impact dynamics in neat and shear thickening fluid kevlar /." 2007. http://www.lib.utexas.edu/etd/d/2007/rabbr70962/rabbr70962.pdf#page=3.
Повний текст джерела