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Random distribution of fibres

Melro A. R., Camanho R P. and Pinho S. T. (2008) Generation of random distribution of fibres in long-fibre reinforced composites. Composites Science and Techrwlogy, 68(9), 2092-2102. [Pg.358]

Figure 4.1 Sheet structures arising from (a) the random distribution of 970 straight fibres of uniform length, (b) a photomicrograph of a 2.5gmr2 sheet of paper in which the mean fibre length and density correspond to that... Figure 4.1 Sheet structures arising from (a) the random distribution of 970 straight fibres of uniform length, (b) a photomicrograph of a 2.5gmr2 sheet of paper in which the mean fibre length and density correspond to that...
The fusion temperature of these polymers is low enough to allow the spinning of fibres and melt pressing of films 263). They can also be blended with normal thermoplastics such as polystyrene or polyethylene oxide)2711. The conductivity shows a percolation threshold of about 16% which is expected for a random distribution of conducting spheres. [Pg.32]

The l.e.c. values of a series of eight polyketone samples containing 30 %wt. of six different filler materials were measured. The l.e.c. values measured in the x- and y-directions proved to be nearly equal pointing at a random distribution of the fibres in the xy-plane, the average values are listed in Table 3.1. A grafical representation of these data is given in Figure 3.2. [Pg.79]

The reinforcement of the polypropylene with the lignocellulosic material results in the increase of ac conductivity (Figs. 10 and 11). The random distribution of the lignocellulosic fillers in the polypropylene matrix enables rearrangement of the fibres in a chain structure which ensures better carrier mobility in the presence of electric field. The frequency dependence of the electrical conductivity is described by the expression (Jonsher, 1997) ... [Pg.206]

Composites may be characterized according to type of anisotropy. The structural anisotropy created by appropriate distribution of fibres or inclusions should be distinguished from anisotropy of crystals or natural organic materials like bone or wood. The anisotropy of composites is generated more or less purposefully, according to design and adequate technology. At various scales composites with random, unidirectional, bi-directional (laminates) and multidirectional anisotropy are produced. [Pg.8]

In most cases the random distribution (3D) of the fibres is considered in the design of fibre-reinforced concrete. If for any reason other distribution of fibres is envisaged, for example linearized fibres, ID or 2D, or continuous fibres in the form of mats or meshes, then the design of the material s composition should be modified. For that purpose, experience from other results or a trial and error method must be employed. [Pg.445]

Dyck PJ. O Brien P.C. and Ohnishi A. (1977) Lead neuropathy 2. Random distribution of segmental demyelination among old internodes of myelinated fibres J. Neuropath. Eyp. Neurol. 36, 570-575. [Pg.161]

Particle Shape Effect. To this point, we have been dealing only with spherical particle suspensions. When the particles have irregular shapes, the rheological properties are expected to be very different from those of the spherical particle suspensions. Consider, for example, a simple system of cylindrical fibre suspensions. Because the particles are expected to align in the direction of the flow or shear, the viscosity needs to be treated as a second-order tensor, that is, the values of the viscosity under the same condition are different when different directions are referred. Only at the low (zero) shear limit may the particles be randomly distributed and have an isotropic rheological behavior. [Pg.140]

From an analysis of the intensity distribution of the amorphous halo it is concluded that in maximally stretched EB-11 fibres (///o= 4.5), half of the amorphous phase is oriented at random while the other half responds to stretch-alignment and is preferentially oriented in the same direction as the oriented crystalline fraction, although with a very broad di,stribution. The increase in crystallinity upon stretching is due to nucleation of new crystallites rather than growth of preexisting ones. Similar results were arrived at in a more detailed study by means of a four-circle diffiactometer... [Pg.63]

Because of the virtually unlimited variations in fibre arrangements (short and continuous fibres, aligned and randomly distributed, laminated, woven, knitted or braided) there are too many materials available to discuss fully all the details of their fatigue behaviour. This chapter will therefore concentrate on some selected composites for demonstration purposes. We shall discuss both tension fatigue, which is the most important load situation in metals, and compression fatigue. The influence of harsh environments will be mentioned as well. [Pg.159]

Figure 19.6 Olientation of individual fibres during processing (a) initial random distribution, (b) rotation during shear flow and (c) alignment during elongational flow. Figure 19.6 Olientation of individual fibres during processing (a) initial random distribution, (b) rotation during shear flow and (c) alignment during elongational flow.

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