Bidirectional fiber

The specimens for the DMA measurements were prepared as graphite-fiber reinforced resin composite sheets in which the fibers were in the form of a woven cloth, designated as T300-3000, 13 X 13 weave (Union Carbide Thornel 300 yarn, woven by Hexcel). To prepare a specimen, four thicknesses of cloth, in a bidirectional fiber lay, were saturated with resin, vacuum-pumped to remove trapped air, laid smoothly between two sheets of 0.025 mm polyethylene and irradiated to a total dose of 100 kGy. The irradiation was performed at the NRL Van de Graaff accelerator facility with electrons having an energy of 2 MeV. The composites, thus made were approximately 1 mm thick and contained approximately 60 wt percent resin. The specimens cut from these sheets were approximately 10 x 12.5 mm and were measured to the nearest 0.1 mm before inserting into the clamps of the DMA. 

Bidirectional fiber i Continuous strand roving, filament winding... 

Derive expressions for o, Oy, and In Etjuation (4.103) as a furKHon of a, a, and e. Verify that vanishes for Isovopic materials. What Is for a bidirectional woven lamina with equal numbers of fibers In each directions ... 

Bidirectional construction It is an RP with the fibers oriented in various directions in the plane of the laminate usually identifies a cross laminate with the direction 90° apart. 

Scheibel, T., Kowal, A. S., Bloom, J. D., and Lindquist, S. L. (2001). Bidirectional amyloid fiber growth for a yeast prion determinant. Curr. Biol. 11, 366-369. 

Thus, the fiber is impregnated in the partially cured resin. Depending upon the assembly the fiber is usually unidirectional, but they can also be made bidirectional or some other combination. The process of fitting the prepreg into, generally onto, the mold is called layup. Generally a number of layers of prepreg are used. The lay-up may be done by hand, called hand lay-up, or done automatically, or by a combination of automatic and hand layup. As expected, hand lay-up is more costly but is essential where one-of-a-kind products are produced. 

Tashiro A, Dunaevsky A, Blazeski R, Mason CA, Yuste R (2003) Bidirectional regulation of hippocampal mossy fiber filopodial motility by kainate receptors a two-step model of synaptoge-nesis. Neuron 38 773-84... 

The materials tested were mainly unidirectional and bidirectional satin cloth laminate. Unsaturated polyester resin was used as a matrix. The tensile strength ratio of longitudinal fiber to transverse fiber was... 

The optical fibers were loaded in an array of up to 40 fibers each placed in an individual U-shaped groove cut into an aluminum block, shown in Fig. 4.13. This technique allowed multiple fibers to be imprinted with the cicada wing mould in a simple and rapid manner that was not critically reliant upon alignment. The resolution obtained with this method was better than 15 nm, producing bidirectional optical fiber prober for SERS with enhancement factors only slightly less than those obtained from the original structures on the cicada wings. 

In the application of bidirectional patterns, the end domes can be formed by fibers that are laid down in polar winding patterns. The best geometrical shape of the dome is an oblated hemispheroid. Theoretically, the allowable stress level in the two perpendicular directions should be identical. However, the efficiency of the longitudinal fibers is less than that of the circumferential fibers. It is possible to estimate an optimum or length-to-diameter ratio of a cylindrical case for a given volume. 

A large number of studies have been made on a of polymer matrix composites of epoxy, polyimide and other polymers reinforced with carbon and Kevlar fibers [117-123]. The carbon and graphite fibers are characterized by slightly negative (Xi in their axial directions and very large positive aj in their radial directions [122-124]. The unidirectional and bidirectional composites based on them are found to demonstrate highly anisotropic thermal expansion behavior. In unidirectional composites,... 

There is no question that the number of EP +PLC pairs used for various applications will increase in the future. At the same time, we are currently working on HC + PLC systems (36,37). Even before including a PLC, the HC we use shows three improvements as compared to typical HCs. First, RR consists of thin and therefore flexible glass fibers (GFs). Second, the GFs are comingled with an EP using a coujjing agent Third, the GFs we use are not only unidirectional but also bidirectional, in the form of mats. 

Bidirectional fabric n. A fabric having reinforcing fibers in two directions, i.e., in the warp (machine) direction and filling (cross-machine) direction. 

Bidirectional laminate n. A fiber-reinforced material in which the fibers are laid in two different directions, typically in the length and width directions. In particular such a laminate in which equal volumes of reinforcing fibers are laid in the two directions. 

Woven roving Coarse fabric, bidirectional reinforcement, mostly plain weave, but some twill. Uni-and multidirectional nonwoven rovings are also produced. K to T fiber, fabric weights 10-48 oz/yd. HSB. Mostly wet lay-up, but some press molding. 

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