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Gotowa bibliografia na temat „Shear thickening fluids”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Shear thickening fluids"

Gürgen, Selim. "An investigation on composite laminates including shear thickening fluid under stab condition". Journal of Composite Materials 53, nr 8 (22.08.2018): 1111–22. http://dx.doi.org/10.1177/0021998318796158.

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Shear thickening fluids have been extensively utilized in composite laminate structures to enhance the impact resistance in the last decade. Despite the contribution of shear thickening fluids to the protective systems, the mechanism behind the energy absorption behavior of shear thickening fluids is not fully understood. In the present study, various configurations of composite laminates were prepared and these structures were investigated under low velocity stab conditions. Contrary to the common idea of shear thickening fluid impregnation for fabrics, shear thickening fluids were used in bulk form and by means of this, pure contribution of shear thickening behavior to the energy absorption was investigated. To hold the bulk shear thickening fluids in the composite laminates, Lantor Soric SF honeycomb layers were filled with shear thickening fluids and Twaron fabrics were plied in the structures as the reinforcement. As a result of this study, it is stated that shear thickening behavior is insufficient to effectively improve the energy absorption performance of composite laminates; however, shear thickening fluids are beneficial to fabric based composites because the inter-yarn friction of fabrics is enhanced using shear thickening fluids as an impregnation agent rather than a bulk form.

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Wang, Lijuan, Kejing Yu, Diantang Zhang i Kun Qian. "The cut resistant characteristics of organic high-performance yarns and STF/yarns". Journal of Industrial Textiles 49, nr 10 (20.11.2018): 1317–33. http://dx.doi.org/10.1177/1528083718811091.

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This paper mainly investigated the cut resistant property of shear thickening fluid enhanced organic high-performance yarn. Cut tests of neat yarn and shear thickening fluids/yarn were performed with two cutting angles. External forces involved in the cutting were analyzed. A simple theoretical relation was established based on the principle of the energy conversion. Two types of shear thickening fluids were prepared. Compared to neat yarn, the shear thickening fluids/yarn exhibited extremely high cut resistant property, especially, shear thickening fluids/yarn with graphene, indicating a synergistic effect. Fracture surfaces of fibers after yarns cut off were initially studied, which verified the cut resistant characteristics of organic high-performance yarns and shear thickening fluids/yarn.

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Wei, Minghai, Li Sun, Peipei Qi, Chunguang Chang i Chunyang Zhu. "Continuous phenomenological modeling for the viscosity of shear thickening fluids". Nanomaterials and Nanotechnology 8 (1.01.2018): 184798041878655. http://dx.doi.org/10.1177/1847980418786551.

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In general, shear thickening fluids show a marked increase in viscosity beyond a critical shear rate, which can be attributed to the hydrodynamic clustering effects, where in any external energy acting on a shear thickening fluid is dissipated quickly. However, there is a lack of theoretical modeling to predict the viscosity curve of shear thickening fluids, which changes continuously with the increasing shear rate. In this article, a phenomenological continuous viscosity modeling for a class of shear thickening fluids is proposed. The modeling predicts shear thickening and thinning behaviors that are naturally exhibited by shear thickening fluids for high and high enough values of the shear rate. The result shows that the phenomenological modeling provides a very good fit for several independent experimental data sets. Therefore, the proposed modeling can be used in numerical simulations and theoretical analysis across different engineering fields.

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Wang, Ruining, Ying Zhou, Qiushi Wang, Runjun Sun, Xiaoya Jia i Mingyue Tian. "The influence of carbon nanotube addition on the shear-thickening performance of suspensions". Thermal Science 27, nr 3 Part A (2023): 1787–93. http://dx.doi.org/10.2298/tsci2303787w.

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The shear thickening fluid as a protective material has received increasing attention, and its impact resistance and its rheological properties are controllable by integrating various kinds of additives to a single phase shear thickening fluid. In this paper, the rheological properties of shear thickening fluids with 26 wt.% fume silica, PEG200 and different mass fraction of multi-walled carbon nano-tubes are investigated, and the effect of temperature from -5?C to 55?C on steady state rheological properties of 1.0 wt.% multi-walled carbon nanotubes reinforced shear thickening fluids is studied. Finally a single yarn pull-out test is conducted to examine the influence of multi-shear thickening fluid on the shear strength and inter-yarn friction of fabrics. The results show that the addition of multi-walled carbon nanotubes can improve significantly the viscosity and shear thickening efficiency.

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Ali, N., Y. Wang, T. Hayat i M. Oberlack. "Numerical solution of peristaltic transport of an Oldroyd 8-constant fluid in a circular cylindrical tube". Canadian Journal of Physics 87, nr 9 (wrzesień 2009): 1047–58. http://dx.doi.org/10.1139/p09-081.

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The present paper is concerned with the peristaltic flow of a non-Newtonian fluid in circular cylindrical tube. Long wavelength and low Reynolds number approximations are adopted in the problem definition. The non-Newtonian behaviour of the fluid is characterized by the constitutive equation of an Oldroyd 8-constant fluid. The governing nonlinear equation and boundary conditions are solved numerically by a suitable finite-difference method with an iterative scheme. It is seen that shear-thinning and shear-thickening phenomena can be explained through the chosen fluid model. The interaction of shear-thinning and shear-thickening effects with peristaltic motion is studied in detail with particular focus on the basic features of peristalsis such as flow characteristics, pumping characteristics, and trapping. It is found that pressure rise per wavelength against which peristalsis has to work as a positive displacement pump decreases in going from shear-thickening to shear-thinning fluids. Moreover, for strong shear-thinning fluids trapping does not appear. However, a trapped bolus occurs for a weak shear-thinning fluid and its size increases as the fluid is changing from shear thinning towards weak shear thickening. For strong shear-thickening fluids such increase in the size and circulation of bolus stops.

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Wang, Yan, Shu Kui Li i Xin Ya Feng. "The Ballistic Performance of Multi-Layer Kevlar Fabrics Impregnated with Shear Thickening Fluids". Applied Mechanics and Materials 782 (sierpień 2015): 153–57. http://dx.doi.org/10.4028/www.scientific.net/amm.782.153.

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This study investigates the ballistic penetration performance of aramid fabric impregnated with shear thickening fluid. The ballistic test was conducted at impact velocity of 445 m/s, and three types of shear thickening fluids prepared with silica particles of different sizes (200nm, 340nm and 480nm) are involved. The results demonstrate an enhancement in ballistic properties of fabric due to the impregnation of shear thickening fluids. The fabrics with smaller particle size show better ballistic performance. Microscopic observation of aramid fabric reveals that shear thickening fluids with smaller silica particles have a better adhesion on and between yarns, enhancinging the coupling effect between yarns. The corresponding mechanism was discussed in the paper.

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Selver, Erdem. "Tensile and flexural properties of glass and carbon fibre composites reinforced with silica nanoparticles and polyethylene glycol". Journal of Industrial Textiles 49, nr 6 (28.01.2019): 809–32. http://dx.doi.org/10.1177/1528083719827368.

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This paper attempts to show the effect of silica nanoparticles and polyethylene glycol mixture (shear thickening fluids) on tensile and flexural properties (3-point bending) of glass and carbon fibre-reinforced thermoset composite laminates. The shear thickening fluids were prepared by combination of silica nanoparticles and polyethylene glycol using various silica contents (10–20 wt%). A viscometer was used to evaluate the shear thickening characteristics and viscosity of shear thickening fluids increased by increasing the silica content. Shear thickening fluids were impregnated on the host of glass and carbon fabrics and subsequently converted to composite laminates using vacuum infusion method with an epoxy matrix. It was found that shear thickening fluids-treated carbon and glass fabric composites exhibited up to 10% and 12% higher tensile strength than neat composites whilst the tensile modulus increased about 24%. Shear thickening fluids-treated fabric composites exhibited slower damage propagation compared to brittle nature of untreated fabric composites. However, lower flexural strength with higher energy absorption (up to 27%) were obtained after using shear thickening fluids for both carbon and glass fibre composites.

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Bouchendouka, Abdellah, Zine El Abiddine Fellah, Zakaria Larbi, Zineeddine Louna, Erick Ogam, Mohamed Fellah i Claude Depollier. "Fractal Analysis of a Non-Newtonian Fluid Flow in a Rough-Walled Pipe". Materials 15, nr 10 (22.05.2022): 3700. http://dx.doi.org/10.3390/ma15103700.

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The fully developed laminar flow of a viscous non-Newtonian fluid in a rough-walled pipe is considered. The fluid rheology is described by the power–law model (covering shear thinning, Newtonian, and shear thickening fluids). The rough surface of the pipe is considered to be fractal, and the surface roughness is measured using surface fractal dimensions. The main focus of this study lies in the theoretical investigation of the influence of the pipe surface roughness on the velocity profile and the Darcy friction factor of an incompressible non-Newtonian fluid. The plotted results demonstrate that shear thinning fluids are the most sensitive to the surface roughness compared with Newtonian and shear thickening fluids. For a particular value of the surface fractal dimension, there exists an intersection point where shear thinning, Newtonian, and shear thickening fluids behave the same way regarding the amplitude of the velocity profile and the friction factor. This approach has a variety of potential applications, for instance fluid dynamics in hydrology, blood flow in the cardiovascular system, and many industrial applications.

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Evans, G. T. "Shear thinning vs shear thickening in associating fluids". Journal of Chemical Physics 108, nr 4 (22.01.1998): 1570–77. http://dx.doi.org/10.1063/1.475528.

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Li, Wei Hua, i Xian Zhou Zhang. "Rheology of Magnetorheological Shear Thickening Fluids". Advanced Materials Research 32 (luty 2008): 161–64. http://dx.doi.org/10.4028/www.scientific.net/amr.32.161.

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This paper presents fabrication and characterizing of a new functional material, magnetorheological shear thickening fluid (MRSTF), by mixing micron-sized magnetizable particles with nano-sized silica particle based shear thickening fluid. Dynamic properties of the MRSTF were characterized by using a parallel-plate rheometer. The effects of steady-state shear rate and magnetic field on MRSTF rheological properties were addressed. The suspension shows an abrupt increase in complex viscosity beyond a critical dynamic shear rate and a magnetic field controllable characteristic, as well as reversible.

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Rozprawy doktorskie na temat "Shear thickening fluids"

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.

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In this study, we have considered the modal and non-modal stability of fluids with shear-dependent viscosity flowing in a rigid straight pipe. A second order finite-difference code is used for the simulation of pipe flow in the cylindrical coordinate system. The Carreau-Yasuda model where the rheological parameters vary in the range of 0.3 < n < 1.5 and 0.1 < λ < 100 is represents the viscosity of shear- thinning and shear thickening fluids. Variation of the periodic pulsatile forcing is obtained via the ratio Kω/Kο and set between 0.2 and 20. Zero and non-zero streamwise wavenumber have been considered separately in this study. For the axially invariant mode, energy growth maxima occur for unity azimuthal wave number, whereas for the axially non-invariant mode, maximum energy growth can be observed for azimuthal wave number of two for both Newtonian and non-Newtonian fluids. Modal and non-modal analysis for both Newtonian and non-Newtonian fluids show that the flow is asymptotically stable for any configuration and the pulsatile flow is slightly more stable than steady flow. Increasing the maximum velocity for shear-thinning fluids caused by reducing power-low index n is more evident than shear-thickening fluids. Moreover, rheological parameters of Carreau-Yasuda model have ignored the effect on the peak velocity of the oscillatory components. Increasing Reynolds number will enhance the maximum energy growth while a revers behavior is observed by increasing Womersley number.

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Zhu, Weijie Kelvin. "Numerical analysis of shear thickening fluids for blast mitigation applications". Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/10717.

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Improvised Explosive Devices (IEDs) have evolved over the years to become one of the main causes of casualties and fatalities in recent conflicts. One area of research focuses on the improvement of blast attenuation using Shear Thickening Fluid (STF). The STF is a dilatant material, which displays non-Newtonian characteristics in its unique ability to transit from a low viscosity fluid to a high viscosity fluid. Although empirical research and computational models using the non-Newtonian flow characteristics of STF have been conducted to study the effects of STF on blast mitigation, to the author's best knowledge, no specific research has been performed to investigate the STF behavior by modeling and simulation of the interaction between the base flow and embedded rigid particles when subjected to shear stress. The model considered the Lagrangian description of the rigid particles and the Eulerian description of fluid flow. The numerical analysis investigated key parameters such as applied flow acceleration, particle distribution arrangement, volume concentration of particles, particle size, particle shape, and particle behavior in Newtonian and Non-Newtonian fluid base. The fluid-particle interaction model showed that the arrangement, size, shape and volume concentration of particles had a significant effect on the behavior of STF. Although non-conclusive, the addition of particles in Non-Newtonian fluids showed a promising trend of better shear thickening effect at high shear strain rates.

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Tabassum, Maisha. "Mechanical and Energy-Absorbing Properties of Shear-Thickening Fluids (STFs)". Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/16856.

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The absorption of dynamic energy during impact of a material is ubiquitous in industrial, biomedical and military applications. From suspension systems to shock absorbers, the ability to divert or dissipate dynamic energy imposes many challenges in developing these systems. Some typical complex composite fluids, such as shear-thickening fluids (STFs), play a vital role in these challenges. STFs, classified as non-Newtonian fluids, are special fluidic composites of dense suspensions which dramatically change their viscosity when subjected to a change in shear rate or stress. These fluidic composite materials display unusual phase transitions between liquid and “solid” phases, due to recoverable changes in viscosity at a critical rate of shear. In recent years, STFs have stimulated much research interest, in which most studies have been focused on the rheological and energy absorption properties of fabrics soaked with STF under impact. The fundamental knowledge of STFs after their shear-thickening transition is still unarticulated. Without full understanding of the fundamental structure-property relationships of STFs after shear-thickening transition it would not be able to design and optimize a material system with STFs, nor could cost-effective development of STFs as energy-absorbing materials be achieved. The aim of the studies in this thesis is to establish fundamental knowledge in developing STFs as adaptive energy-absorbing materials in practical applications. The studies establish methods and approaches for investigating and characterizing the mechanical as well as the energy-absorbing/dissipation properties of a STF systematically after the shear-thickening transition. The STF adopted in this work was composed of 58 vol.% dispersion of styrene/acrylate particles in ethylene glycol. Microscopic examination was conducted to characterize the size, geometry and distribution of styrene/acrylate particles in the STF, and the rheological behaviours of the STF were measured. Double-cantilever-beam specimens with the STF as adhesive layer were adopted to characterize the mode-I fracture energy of the STF at different crack opening displacement rates, following classic fracture mechanics. High-speed digital video-photography was used to observe the deformation behaviour of the STF. The load-displacement curve as well as the high-speed video recording confirmed that the STF showed a “solid” behaviour at high rates by developing rapid but stable crack extension that corresponded to fracture behaviour. The results indicated that the displacement rate and the STF thickness had a significant effect on the magnitude of the mode-I fracture energy of the STF. The fracture energy increased with an increase in the displacement rate, while a plateau value of about 240 J/m2 was observed at high rates. The measured fracture energy can be used as an effective parameter characterizing the crack resistance or the energy-absorbing capacity of the STF in the solid phase. The lap-shear strength and the braking energy of the STF were quantitatively characterized by a modified single-lap shear test method, performed by using two stainless steel adherends with the STF as adhesive layer. The results indicated that the shear rate had a significant effect on lap shear strength and the braking energy of the STF. Moreover, the studies were conducted to quantitatively characterize the energy absorption capacity of the STF under penetration impact and pull-out fracture at different impact or pull-out speeds. The results confirmed that the penetration rate again had a significant effect on the energy absorbing capacity of the STF. In comparisons with the energy absorbing behaviour of some cellular materials in the literature, the STF outperformed a polyurethane foam in terms of energy absorbing capacity. The ability of a STF to maintain its reversible shear-thickening transition behaviour depends on the integrity and durability of the STF. Cyclic dynamic loading at different magnitudes of durations was applied to the STF in order to quantitatively evaluate its aging behaviour. It was observed that cyclic dynamic loading affected the shear-thickening behaviour of the STF because of deterioration of the styrene/acrylate particles caused by abrasive wear during interaction between them, based on the rheological characterization. This research has delivered some new and original results for solutions to the outstanding problems in developing STFs as energy-absorbing materials. It should bring new opportunities for the development of new and advanced material systems with STFs for practical applications.

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Shah, Ashish, i 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.

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Abstract In order to improve the optimisation of mineral processing operations the rheological properties of slurries must be determined as accurately as possible under the conditions that closely resemble actual site conditions. The rheology of particles suspended in Newtonian fluids is well documented. However, the rheology of particles in non-Newtonian fluids has not been the subject of much investigation till now. The work conducted here attempts to fill this gap in knowledge. The rheological properties of slurries are heavily dependent on the solids concentrations and particle-solid interaction. At low solids concentrations, constant viscosity and Newtonian behaviour is observed, but as solids concentration increases the rheological behaviour becomes increasingly complex and non-Newtonian with viscosity becoming dependent on the shear rate. The nature of the non-Newtonian behaviour depends on the solid concentration, particle shape, particle size, particle size distribution and the suspending liquid rheological properties. The suspension/slurry may develop a yield stress and become time dependent in nature as structures develop within the fluid at higher solids concentrations. This study however, is primarily focused on the measurement of the rheological properties, where it is assumed that the fluid will be fully sheared and that the rheological properties will be unlikely to change with time. Shear thickening behaviour of slurries was the focus of this work. The aim was to investigate the slurry concentration region where shear thickening occurs. The first objective of the project was to develop a fluid analogue which will have similar rheological behaviour to that of concentrated tailings from gold mines so that it can be used as a test material to simulate the flow behaviour of the tailings in a pipe. The second objective of this project was to enable the prediction of flow behaviour in the pipe loop under certain conditions using the fluid analogue for slurry from Sunrise dam. In order to achieve the objectives, experiments were carried out to obtain a fluid analogue of a shear thickening slurry. CSL 500 and SR 200 rheometers were used for the characterisation of different fluid analogues and shear thickening mineral slurries. Malvern Sizer, model: mastersizerX v1.1, was used to obtain particle size distributions. A mini pipe loop system, located in the laboratory of the Rheology and Materials Processing Centre (RMPC) was used to get pipe line flow data for comparison with the rheometer data. A few fluid analogues with different suspending medium and different concentrations of glass spheres was tested before finally using, 48 vol% glass spheres in 1.8 wt% CMC solution as a fluid analogue for the mineral tailings obtained from Sunrise dam, WA. For comparison between the pipe line and rheometer data, all pipe line data (in the form of 8V/D) were converted to rheometer data (in the form of du/dr) using the Robinowitsch-Mooney equation. The above comparison indicated that it is possible to produce fluid analogue to simulate the flow behaviour of Sunrise dam slurry using a shear thinning suspending medium with high concentration of glass particles. Shear thickening flow behaviour was clearly observed in the rheometer while it was less predominant in a pipe line flow.

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Madraki, Fatemeh. "Shear Thickening in Non-Brownian Suspensions". Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1584354185678102.

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Hasib, 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.

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A group of materials that have recently gained a lot of attention in research are shear thickening fluids (STF). A shear thickening fluid (STF) is a material whose viscosity increases significantly when the shear strain rate is at critical value. Most shear thickening fluids are designed by using a colloidal suspension of solid particles in a liquid matrix. This allows solidification of the fluid by congregation of the particles under stress. In this study the experimental findings are focused on assessing the mechanical property of shear thickening fluid (STF) after its transition to a solid phase. On account of determining the shear modulus of STF, bending tests were performed on simply-supported sandwich beam made of double carbon epoxy beams with a STF layer. The stiffness of sandwich beam with STF was evaluated for various midpoint displacements varying from 3 mm to 8 mm at fixed crosshead value of maximum speed 50 mm/s and also at different crosshead values from 10 mm/s to 50 mm/s with a maximum displacement of 8 mm. The numerical value of STF’s shear modulus was calculated by using laminate beam theory. The value obtained for the shear modulus of STF is 0.16 MPa. The experimental result was also compared with FEA by using ANSYS where error is no more than 10%. The special interest is also given to investigate the feasibility of integrating STF into a sandwich cantilever beam with the aim of evaluating the damping capacity and stiffness. The response of shear thickening fluid which is the dispersion of styrene/acrylate particles in ethylene glycol was studied to find critical strain rate at different angular frequency. Experiments are also conducted with a carrier fluid layer between two beams and also two beams glued together with epoxy resin. Considering the boundary conditions, the resonance frequency of the sandwich cantilever beam is obtained from the experiments. The dynamic stiffness of the STF sandwich beam shows better result comparing with the beam with carrier fluid and beams with glued together. As the damping ratio of STF integration with sandwich beam performs better than others, the control of vibration caused by dynamic loading is improved while using STF. Without any external energy source, internal property of shear thickening fluid transforms from liquid phase to a solid phase and absorbs energy caused by vibration.

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Xu, 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.

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Cui, 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.

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This thesis aims to study and explore the drop-weight impact-induced solidification process of an STF, consisting of 58 vol% styrene/acrylate particles in ethylene glycol, in a finite volume. The study begins with the characterisation of the mechanical behaviours (i.e., rheological and confined compression behaviours) of the STF. Low-velocity drop-weight impact experiments are conducted to investigate the effect of the STF’s dimensions in a finite volume on the impact behaviour of the STF. It is found that the impact behaviour is related to both the depth and the diameter of the STF. A new model is therefore proposed that the solidification front of an STF advances linearly to the impact velocity with a constant ratio in both the normal and radial directions, respectively, forming a semi-ellipse-like region which is captured by a direct observation with a high-speed camera. When this front propagates to one boundary, a force transmits back to the impact head. The interaction is detected by the load cell and piezoelectric transducers at the boundaries. Moreover, the coupled Eulerian-Lagrangian model and the volume of fluid model are adopted to simulate the development of the solidification front. In both models, the continuous propagation of the solidification front is depicted by expanding of a high-strain-rate region in all directions. The energy absorption under the drop-weight impact is found to decrease with an increase in the depth or width dimension of the STF before their critical dimension is reached due to the extension of the solidification period. Finally, the displacement-control oscillations are conducted on the STF to further explore its reciprocating performance for characterising the resistant force and energy absorption. It is found that the amplitude of displacement has a clear effect on the resistant force and energy absorption, while the frequency has little influence on them after the activation of the shear thickening.

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Ramirez, 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.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.
Includes 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.

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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.

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This thesis aimed to systematically investigate striker shape effect on the mechanical behaviours and energy absorption capabilities of a shear thickening fluid (STF) under low-velocity impact tests. STF is a non-Newtonian colloidal suspension system with a preferable energy absorption capability under both low-velocity and high-velocity impact. This study’s STF consisted of 58.8 vol. % styrene/acrylate co-polymer particles in an ethylene glycol medium. First, rheology tests and scanning electron microscope tests were implemented to study the shear thickening behaviour and submicron-configuration morphology of the styrene/acrylate co-polymer particles, respectively. Subsequently, to investigate the energy absorption properties of this material, low-velocity impact tests were performed by using five types of strikers under various low-impact velocities, with one cone-shaped striker and four cylindrical flat-head strikers with different diameters. The sharp cone-shaped striker was recorded to have lower energy absorption, in comparison with the flat-headed cylindrical striker with the same diameter under all impact velocities. For the cylindrical flat-head strikers, the absorbed energy increased with an increase in the diameter of the striker, although the displacement decreased. These phenomena were attributed to both confinements from the side and bottom boundary towards the STF. In this case, the boundary effect was another factor playing an important role in the low-velocity impact energy absorption, especially with an increase in striker size. In addition, high-speed photography showed cracking in the STF during the impact, indicating the solid-like behaviour of the STF under impact. In this study, energy absorption was assumed to have two stages, before and after the jamming (solidification) zone reached the bottom boundary, which were recognised as the solidification stage and deformation stage, respectively. The impact-activated solidification mechanism indicated that the energy absorption capability depended on the size of the solidification zone. A larger striker is able to produce a larger solidification zone. As the deformation stage in this study, which consisted of an elastic deformation zone and nonlinear deformation zone. For the energy absorption in the deformation stage, using the striker with a cone-shaped head also led to less impact energy absorption in the deformation stage. According to the experimental results, higher impact velocity was able to increase the energy absorption in the deformation stage. In conclusion, the majority of energy absorption occurred in the deformation stage. In other words, an enormous amount of the impact energy was absorbed after the solidification of the STF, rather than during the solidifying process.

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Książki na temat "Shear thickening fluids"

Gürgen, Selim, red. Shear Thickening Fluid. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-35521-9.

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Gürgen, Selim, red. Shear Thickening Fluid. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-25717-9.

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Części książek na temat "Shear thickening fluids"

Sheikhi, Mohammad Rauf, Mahdi Hasanzadeh i Selim Gürgen. "Conductive Shear Thickening Fluids for Multifunctional Purposes". W Shear Thickening Fluid, 13–25. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-35521-9_2.

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Li, Wei Hua, i Xian Zhou Zhang. "Rheology of Magnetorheological Shear Thickening Fluids". W Frontiers in Materials Science and Technology, 161–64. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-475-8.161.

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Mawkhlieng, Unsanhame, Mukesh Bajya i Abhijit Majumdar. "Shear Thickening Fluid–Based Protective Structures Against Low Velocity Impacts". W Shear Thickening Fluid, 115–38. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-25717-9_7.

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Gürgen, Selim. "Introduction". W Shear Thickening Fluid, 1–2. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-25717-9_1.

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Man, Ziyan, i Li Chang. "Shear Thickening Fluid in Surface Finishing Operations". W Shear Thickening Fluid, 99–114. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-25717-9_6.

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Bhalla, Neelanchali Asija. "Shear Thickening Fluid-Based Protective Structures Against High Velocity Impacts". W Shear Thickening Fluid, 139–52. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-25717-9_8.

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Montenegro, Miguel, Laura Campo-Deaño i Francisco J. Galindo-Rosales. "Rheology of Shear Thickening Fluid". W Shear Thickening Fluid, 3–32. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-25717-9_2.

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Sheikhi, Mohammad Rauf, Selim Gürgen i Melih Cemal Kuşhan. "Vibration Damping Systems with Shear Thickening Fluid". W Shear Thickening Fluid, 77–97. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-25717-9_5.

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Gong, Xinglong, Junshuo Zhang i Shouhu Xuan. "Multi-Functional Systems Based on Shear Thickening Fluid". W Shear Thickening Fluid, 53–75. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-25717-9_4.

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Sheikhi, Mohammad Rauf, i Mahdi Hasanzadeh. "Multi-Phase Shear Thickening Fluid". W Shear Thickening Fluid, 33–51. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-25717-9_3.

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Streszczenia konferencji na temat "Shear thickening fluids"

Ashrafi, Nariman, i Habib Karimi Haghighi. "Shear-Thickening Flow Between Coaxial Cylinders". W ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-03038.

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The effects of nonlinearities on the stability are explored for shear thickening fluids in the narrow-gap limit of the Taylor-Couette flow. A dynamical system is obtained from the conservation of mass and momentum equations which include nonlinear terms in velocity components due to the shear-dependent viscosity. It is found that the critical Taylor number, corresponding to the loss of stability of Couette flow becomes higher as the shear-thickening effects increases. Similar to the shear thinning case, the Taylor vortex structure emerges in the shear thickening flow; however they quickly disappear thus bringing the flow back to the purely azimuthal flow. Naturally, one expects shear thickening fluids to result in inverse dynamical behavior of shear thinning fluids. This study proves that this is not the case for every point on the bifurcation diagram.

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Soutrenon, Mathieu, i Véronique Michaud. "Structural damping using encapsulated shear thickening fluids". W SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, redaktor Henry A. Sodano. SPIE, 2012. http://dx.doi.org/10.1117/12.915143.

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Nenno, Paul T., i Eric D. Wetzel. "Rate-dependent extensional "dynamic ligaments" using shear thickening fluids". W SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, redaktor Wei-Hsin Liao. SPIE, 2014. http://dx.doi.org/10.1117/12.2059833.

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Sarkar, Reuben, i James L. Linden. "Theoretical Advantages of Shear Thickening Behavior in Automatic Transmission Fluids". W 2003 JSAE/SAE International Spring Fuels and Lubricants Meeting. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2003. http://dx.doi.org/10.4271/2003-01-1986.

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Ashrafi, Nariman, i Habib Karimi Haghighi. "Stability of Shear-Thickening Liquids Between Rotating Cylinders". W ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39854.

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The effects of nonlinearities on the stability are explored for shear thickening fluids in the narrow-gap limit of the Taylor-Couette flow. It is assumed that shear-thickening fluids behave exactly as opposite of shear thinning ones. A dynamical system is obtained from the conservation of mass and momentum equations which include nonlinear terms in velocity components due to the shear-dependent viscosity. It is found that the critical Taylor number, corresponding to the loss of stability of Couette flow becomes higher as the shear-thickening effects increases. Similar to the shear thinning case, the Taylor vortex structure emerges in the shear thickening flow, however they quickly disappear thus bringing the flow back to the purely azimuthal flow. Naturally, one expects shear thickening fluids to result in inverse dynamical behavior of shear thinning fluids. This study proves that this is not the case for every point on the bifurcation diagram.

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Fischer, Christian, Abdelkrim Bennani, Christopher J. G. Plummer, Véronique Michaud, Pierre-Etienne Bourban, Eric Jacquelin i Jan-Anders E. Månson. "Shear thickening fluids as a tunable damping element: experimental results and modeling". W The 14th International Symposium on: Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring, redaktorzy Yuji Matsuzaki, Mehdi Ahmadian i Donald J. Leo. SPIE, 2007. http://dx.doi.org/10.1117/12.715833.

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Sleiman, Mohamad, Karim Hassoun i Matthias Liermann. "Hydro-Mechanical Constant-Speed Motion Control Using Shear Thickening Fluid". W ASME/BATH 2017 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fpmc2017-4207.

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This paper proposes a novel approach to control the velocity of a piston using dilatant fluid. Commonly, a pressure compensated flow control valve is used for this purpose. It produces excellent results but is mechanically complex. A setup is proposed that makes use of the unique properties of dilatant (i.e. shear thickening) non-Newtonian fluids. A simple tube section filled with dilatant material can be used to achieve very low sensitivity of flow rate vs. pressure difference. A numerical study shows how the power law which relates the fluid shear rate to its viscosity results in this low sensitivity of flow to pressure difference. An experimental setup was build to validate the findings using a cheap and commercially available shear thickening fluid. It was found that the dilatant material used does not have a highly pronounced dilatant property and therefore the sensitivity of flow vs. pressure difference was not as low as desired. Nevertheless, the results support the practical applicability of this novel type of velocity control.

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El Omari, Kamal, i Yves Le Guer. "Thermal Chaotic Mixing of Non-Newtonian Fluids in a Two Rod Mixer". W ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78043.

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We investigate the mixing and heat transfer enhancement in a two rod mixer for highly viscous non-Newtonian fluids. The mixer is composed of two circular rods maintained vertically in a cylindrical tank. Chaotic flows are obtained by imposing temporal modulations of the rotational velocities of the walls. We study the effect of different stirring protocols leading to non-chaotic and chaotic flows on the efficiency of mixing and heat transfer for three different rheological fluid behaviors: shear-thinning, Newtonian and shear thickening. For this purpose we use statistical indicators characterizing the mean value of fluid temperature and its homogenization. We find that chaotic mixing is suitable for shear-thickening fluids for which we observe a manifest enhancement of the thermal mixing (heat extraction and homogenization). This is due to the increase of apparent fluid viscosity in the vicinity of the rotating walls. This aspect confirms the relevance of chaotic mixing for highly viscous fluids.

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Khalili, Fardin, Federico De Paoli i Rasim Guldiken. "Impact Resistance of Liquid Body Armor Utilizing Shear Thickening Fluids: A Computational Study". W ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53376.

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Since the creation of advanced knives and firearms with high rates of speed, safety has always been a vital issue for armed forces. A disadvantage of a regular fabric Kevlar is that, although it has an effective resistance against the impact of low-speed bullets, it reveals its weakness in the case of a stab wound and high-speed bullets. Under these circumstances, a new executable technology of fibers that improves the ballistic performance of the materials utilized in body armors is an essential necessity to build high quality and protective vests which are perfectly bulletproof. The purpose of this study is to investigate the physics and concepts of shear thickening fluids and perform a computational CFD simulation of liquid body armors which consist of a combination of polyethylene glycol liquid and nanoparticles of silica. A model of multiphase flow environment with STFKevlar, as a representative of the non-Newtonian shear thickening fluid (STF), is simulated in STAR-CCM+ in order to analyze the behavior of STFs under impact and performance of novel liquid body armors. In the current simulation, Eulerian multiphase flow and volume of fluid (VOF) are applied to generate three discrete regions and determine the volume fraction of each phase including gas, non-Newtonian liquid and solid which represent air, STFKevlar and bullet, respectively. Moreover, dynamic fluid body interactions (DFBI) and overset mesh are utilized to consider the interactions between the regions and forces applied. In this study, the properties of the bullet are based on characteristics of a regular pistol bullet, and it approaches the STFKevlar with the constant speed of 400 m/s. The results show that the non-Newtonian material is initially at equilibrium state and while the bullet approaches the STFKevlar, it acts like a shear thinning fluid. As a high-speed bullet nears the STFKevlar, it absorbs the significant amount of energy that is applied by the bullet. Consequently, the bullet stops penetrating the STFKevlar in a very small fraction of time due to the considerable increase in viscosity. As the shear rate increases over a certain critical value, viscosity increases remarkably which is the main characteristic of shear thickening transition and finally, it reaches to its maximum value of viscosity in approximately 8 × 10−5sec. In addition, a bullet applies a considerable amount of force on any Kevlar due to its high velocity and kinetic energy; however, the high resistant STFKevlar is approved as a high quality and protective vests which stops the bullet in 6 × 10−4sec.

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Sahu, Akhilesh K., Raj P. Chhabra i V. Eswaran. "Two Dimensional Unsteady Laminar Flow of Power Law Fluids Past a Square Cylinder: A Numerical Study". W ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-69261.

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The two-dimensional and unsteady flow of power-law fluids past a long square cylinder has been investigated numerically in the range of conditions 60 ≤ Re ≤ 160 and 0.5 ≤ n ≤ 2.0. Over this range of Reynolds numbers, the flow is periodic in time for Newtonian fluids. However, no such information is available for power law fluids. A semi-explicit finite volume method has been used on a non-uniform collocated grid arrangement to solve the governing equations. The macroscopic quantities such as drag coefficients, Strouhal number, lift coefficient as well as the detailed kinematic variables like stream function, vorticity and so on, have been calculated as functions of the pertinent dimension-less groups. In particular, the effects of Reynolds number and of the power-law index have been investigated in the unsteady laminar flow regime. The leading edge separation in shear-thinning fluids produces an increase in drag values with the increasing Reynolds number, while shear-thickening behaviour delays the leading edge separation. So, the drag coefficient in the above-mentioned range of Reynolds number, Re, in shear-thinning fluids (n < 1) initially decreases but at high values of the Reynolds number, it increases. As expected, on the other hand, in case of shear-thickening fluids (n > 1) drag coefficient reduces with Reynolds number, Re. Furthermore, the present results also suggest the transition from steady to unsteady flow conditions to occur at lower Reynolds numbers in shear-thickening fluids than that in Newtonian fluids. Also, the spectra of lift signal for shear-thickening fluids show that the flow is truly periodic in nature with a single dominant frequency in the above range of Reynolds number. In shear-thinning fluids at higher Re, quasi-periodicity sets in with additional frequencies, which indicate the transition from the 2-D to 3-D flows.

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Raporty organizacyjne na temat "Shear thickening fluids"

Nenno, Paul, Wai Chin i Eric D. Wetzel. Flammability Testing of Fabrics Treated with Oil-Based Shear Thickening Fluids. Fort Belvoir, VA: Defense Technical Information Center, maj 2014. http://dx.doi.org/10.21236/ada601457.

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Hosur, Mahesh, Norman Wagner, C. T. Sun, Vijaya Rangari, Jack Gillespie, Shaik Jeelani i Hassan Mahfuz. Development of Flexible Extremities Protection utilizing Shear Thickening Fluid/Fabric Composites. Fort Belvoir, VA: Defense Technical Information Center, styczeń 2012. http://dx.doi.org/10.21236/ada571815.

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Chin, Wai K., i Eric D. Wetzel. Breathability Characterization of Ballistic Fabrics, Including Shear Thickening Fluid-Treated Fabrics. Fort Belvoir, VA: Defense Technical Information Center, marzec 2008. http://dx.doi.org/10.21236/ada478300.

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