Tensile and Flexural Properties of Fiber Composite Dilatant Compound
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We studied the application of the dilatant compound, which is the polymer-based material with dilatancy properties, to the matrix of the fiber composite material. The basic mechanical properties of the dilatant compounds have been studied, but no research has been done on fiber composite dilatant compound. In this paper, the tensile test and the three-point flexural test of fiber composite dilatant compound were performed. We discussed the influence of fiber orientation, fiber length, and fiber diameter on tensile load and flexural load by changing the deformation speed.Keywords:
Dilatant
Abstract A novel formulation is presented applicable to flows of inelastic, shear-thinning and shear-thickening, fluids between parallel plates. The solution is documented by comprehensive contour maps allowing flow descriptions to be reconstructed for the Ostwald-deWaele and the Cross-/Carreau fluid model fluids within an exhaustive range of rheological and flow parameters, 0 < n ≤ 2 and 0 ≤ q ≤ 2. The description of pseudoplastic behavior is extended to values approaching zero, numerical stability permitting (0.01 ≤ n < 1). The paper highlights the dilatant behavior, 1 ≤ n ≤ 2, reported previously to arise in certain heterogeneous systems, and shown to affect significantly other types of non-Newtonian flows. It is suggested that in thermally and compositionally developing flows, typical of reactive processing, where dilatancy may arise, the present formulation can facilitate solutions to the coupled rheological and heat/mass transfer problems encountered. The newly generated data on dilatant liquids suggest a dramatic increase in energy dissipation with the increasing degree of dilatancy.
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Shear thinning
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In this Paper, the split tensile and flexural stren gth together with the setting time of concrete by p artial replacement of cement with nano-phase Fe 2O3 particles has been studied. Fe 2O3 nanoparticles with the average diameter of 15 nm were used with four different contents of 0.5%, 0.1%, 1. 5% and 2.0% by weight. The results showed that the use of nano- Fe 2O3 particles up to maximum replacement level of 2.0% produces concrete with improved split tensile streng th. However, the ultimate strength of concrete was gained at 1.0% of cement replacement. The flexural strength of fresh concrete was increased by increasing the content of Fe 2O3 nanoparticles. The setting time of fresh concrete was decreased by increasing the content of Fe 2O3 nanoparticles. It is concluded that partial replac ement of cement with nanophase Fe 2O3 particles improves the split tensile and flexural strength of concrete but decreases its setting time. (Journal of Americ an Science 2010;6(4):90- 93). (ISSN: 1545-1003).
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We perform experiments and numerical simulations to investigate spatial distribution of pressure in a sheared dilatant fluid of the Taylor-Couette flow under a constant external shear stress. In a certain range of shear stress, the flow undergoes the shear thickening oscillation around 20 Hz. We find that, during the oscillation, a localized thickened band rotates around the axis with the flow. Based upon experiments and numerical simulations, we show that a major part of the thickened band is under negative pressure even in the case of discontinuous shear thickening, which indicates that the thickening is caused by Reynolds dilatancy; the dilatancy causes the negative pressure in interstitial fluid, which generates contact structure in the granular medium, then frictional resistance hinders rearrangement of the structure and solidifies the medium.
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Split Hopkinson Pressure Bar
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The volumetric strain due to stress-dilatancy of sand is found to be composed of a reversible dilatancy component and an irreversible dilatancy component. The former is characterize by its reversibility and dependency on the magnitude and direction of the current shear strain, and conversely, the latter by its irreversibility and dependency on past shear history. New mechanisms and formulation have been developed for a description of the reversible and irreversible dilatancy. Influence of the irreversible dilatancy component on the stress-strain response was also investigated based on new experimental observations.
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A dense mixture of granules and liquid often shows a severe shear thickening and is called a dilatant fluid. We construct a fluid dynamics model for the dilatant fluid by introducing a phenomenological state variable for a local state of dispersed particles. With simple assumptions for an equation of the state variable, we demonstrate that the model can describe basic features of the dilatant fluid such as the stress-shear rate curve that represents discontinuous severe shear thickening, hysteresis upon changing shear rate, and instantaneous hardening upon external impact. An analysis of the model reveals that the shear thickening fluid shows an instability in a shear flow for some regime and exhibits the shear thickening oscillation (i.e., the oscillatory shear flow alternating between the thickened and the relaxed states). The results of numerical simulations are presented for one- and two-dimensional systems.
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Herschel–Bulkley fluid
Generalized Newtonian fluid
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A theory for the rheological behavior of dilatant (shear-thickening) fluids was developed. The theory based on physical-chemical principles was shown to overcome the shortcomings of existing theories. In addition, it was found that the theory predicted the rheological behavior of dilatant (shear-thickening) fluids as affected by particle size, suspending medium characteristics, temperature, and concentration.
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The relation function of rock dilatancy and confining pressure is investigated by theoretical and experimental methods.The relationship between rock dilatancy and confining pressure is investigated by theoretical and experimental methods.It is found that the state of stress and confining pressure has a significant influence on rock dilatancy,and the main parameter of rock dilatancy is dilatancy corner and dilatancy indices.Through the relationship between dilatancy index and confining pressure,the tunnel stability analysis and rock support design can be better guided,which has a larger significance.
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