Flow Induced Alignment in Composite Materials by T. D. Papathanasiou, D. C. Guell

By T. D. Papathanasiou, D. C. Guell

From the PrefaceThe objective of this ebook is to give inside of a unmarried quantity, special info about the technological know-how, processing, functions, characterization and homes of composite fabrics bolstered with brief fibres which have been orientated in a popular path through flows coming up in the course of processing. This ebook is meant to be worthwhile to . . . fabrics scientists and different experts within the box . . . and engineers, designers and manufacturers of composites strengthened with brief fibres. To our wisdom, this is often the 1st time info touching on this significant classification of engineering fabrics has been systematically awarded inside a unmarried quantity. the aim of aligning brief fibres in a fibre-reinforced fabric is to enhance the mechanical homes of the ensuing composite. Aligning the fibres, often in a popular path, lets them give a contribution up to attainable to reinforcing the cloth. In a few circumstances, the mechanical houses of those aligned, short-fibre composites can method these of continuous-fibre composites, with the additional good thing about low creation expenditures and bigger ease of construction. The booklet covers concept, processing, characterization and houses. extra in particular, the themes thought of . . . contain fibre alignment and fabric rheology; strategies that could produce fibre alignment in polymeric, liquid crystal polymeric and metal composites; fabrics characterization and mechanical homes; and modelling of tactics and fabric houses.

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For example, the automobile brought a new age of personal mobility. Digital computers solve problems that once were intractable. Solid state electronic components make today’s digital computing age possible, and they make electronic devices significantly smaller and more reliable. Personal computers allow documents and presentations to be continuously refined and improved with little effort (although whether this constitutes an advance in productivity is perhaps open to 36 Flow-induced alignment in composite materials debate).

In this section, these issues are briefly described and their impact on aligned-fiber composites manufacturing is noted. Fiber breakage during processing can be a significant problem if it reduces the ability of the fibers to bear the required load. 7, fibers shorter than a critical length cannot develop their maximum sustainable stress and are less efficient at reinforcing the material. In such a case, the mechanical properties of continuous-fiber composites are not approached. Mechanisms that induce fiber breakage during processing include the viscous fluid mechanical forces acting on the fibers and the interaction of the fibers with the processing equipment.

80During the forming process, the fibers must not be compressed, but instead must be kept in tension to avoid the wrinkling caused by compression. If a fabric is used, interlocking of the fiber bundles must also be maintained to keep the fibers in their relative orientations. 28 Flow-induced alignment in composite materials Tensile deformation is therefore the preferred mode for the ordered short-fiber sheets during forming. Such deformation allows better control of the fiber placement and reduces fiber wrinkling.

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