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A mathematical model is developed to predict the orientation distribution function of rigid fibers in concentrated suspensions. The model contains a phenomenological term to account for interactions between fibers. Predictions of the model are tested against experiments in simple shear flow, using suspensions of nylon monofilaments in silicone oil.
Distribution of steel fibers in crack surface of specimens was evaluated by visual inspection. The used steel fibers were hooked fibers with aspect ratio of 64, 67 and 80.
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Fibers include steel fibers, glass fibers, synthetic fibers and natural fibers. In addition the character of fiber-reinforced concrete changes with varying concretes, fiber materials, geometrics, distribution, orientation and densities. The fiber is often describes by a convenient parameter called “aspect ratio”.
The use of steel fibers has led to the improvement of the concrete's mechanical properties such as material toughness in tension and also durability. Many types of steel fibers are used for concrete reinforcement. Round fibers are the most common type and their diameter ranges from 0.25 to 0.75 mm.
Fiber distribution in fiber reinforced cementitious composites (FRCC) is a critical factor affecting the reinforcement of fiber to composites. However, evaluation of fiber distribution in 3-dimension (3D) space has always been a great challenge due to the lack of transparency of FRCC and random distribution of fiber.
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SHORT FIBERS DISTRIBUTION INVESTIGATION IN FIBER CONCRETE stresses in material. In the present investigation SFRHSCcasting was modeled as filling the mould by viscous flow. Simultaneously single steel fiber rotation and motion in the flow with internal velo-city gradients were investigated experimentally and numerically (using FEM).
distribution and orientation of fibers in steel fiber reinforced concrete Measurements were made on the number of fibers per unit cross-sectional area in steel fiber reinforced concrete specimens incorporating various volume fractions of fibers of different types.
The boundary effect would be weakened with the increase of specimen size. Effect of fiber volume fraction on fiber distribution. Five kinds of volume fractions were considered including 0.6%, 1.0%, 1.4%, 1.8% and 2.2%, the dimension of specimens were 70 mm × 70 mm × 70 mm. The test results were shown in Fig.
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In steel fiber reinforced concrete (SFRC), the fibers are generally considered to be oriented isotropically. However, it is known that the procedures used in the specimen fabrication during quality control and material characterization may influence the distribution of the fibers significantly.
fiber orientation distribution are included in eqn (12). Thus eqn (12) is a suitable probability density function for describing the fiber orientation distribution and will be used in the present study. The mean fiber orientation, e,,,,, can be derived
Fiber fragmentation test (FFT) ε Output: number of fiber breaks as a function of applied strain + yields strength distribution from a single test + characterizes an individual fiber - residual strain estimate needed - for non-linear elastic fibers, fiber stress-strain response needed to convert limit strain to stress.
PDF | In steel fiber reinforced concrete (SFRC), the fibers are generally considered to be oriented isotropically.
The present study was performed to investigate the effect of applying homogeneous magnetic field (HMF) of density 0.5 Tesla (T) to steel fiber reinfor…
NRMCA supports the continued expansion and improvement of the ready mixed concrete industry through leadership, advocacy, professional development, promotion and partnering.
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title = "Effects of orientation distribution of particles or fibers on elastic reinforcement of composites", abstract = "Elastic reinforcement theories for particle-filled composites and for fiber composites are reviewed, and compared with the extended equivalent inclusion method proposed by the authors.
The fiber orientation tensor can be used to operate on the constitutive matrix of a comparable composite material that contains perfectly aligned fibers to compute the anisotropic stiffness matrix of the actual composite material with the specified fiber orientation distribution (a process referred to as fiber orientation averaging ).
Based on research and an article in ACI Materials Journal titled “Distribution and Orientation in Steel Fiber ReinforcedConcrete,” a formula has been developed to give a fiber dosage when the “As” is known. The formula is: Fd= As x 2119/T. Using the above formula for a 6” slab, the fiber dosage would be 25 pounds per cubic yard. For an 8” slab, the fiber dosage would be 25 pounds per cubic yard. How can this be?
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of concrete, steel fibers are expected to have the equal orientation factors in any directions and the effect of boundaries is not considerable. In the presence of relatively close distance boundaries with respect to the fiber length, the orientation factor will become greater. According to the condition (2D, 3D), the orientation
Fiber segment orientation distributions were extracted from volumetric X-ray microtomography data sets of hydroentangled nonwoven fabrics manufactured from parallel-laid, cross-laid, and air-laid webs. Spherical coordinates represented the orientation of individual fibers.
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The diffusion-weighted signal attenuation measured over the surface of a sphere can then be expressed as the convolution over the sphere of a response function (the diffusion-weighted attenuation profile for a typical fiber bundle) with the fiber orientation density function (ODF). The fiber ODF (the distribution of fiber orientations within the voxel) can therefore be obtained using spherical deconvolution.
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Effect of short fibers orientation on mechanical properties of composite material – fiber reinforced concrete. Traditional fiberconcrete structures have fibres in the mix oriented in all spatial directions, distributed in the structural element volume homogenously, what not easy to obtain in practice.
Macro synthetic fibers increase the fatigue performance better than steel fibers . at the correct dosage. • Macro synthetic fibers in the range of . 7.5 to 10.5 lbs. / cu. yd. provides . the greatest combination of fatigue, toughness, and pre-cracked fatigue performance. • The use of fibers has an effect on the design thickness of pavements, resulting