Download PDF by A Miravete: 3-D Textile Reinforcements in Composite Materials

By A Miravete

Laminated composite fabrics were used because the Sixties for structural purposes. this primary new release of fabrics have been winning as a result of the fabrics excessive stiffness and energy functionality. The goals of this ebook are to explain the producing strategies, to spotlight the benefits, to spot the most functions, to examine the tools for prediction of mechanical homes and to target the major technical points of those fabrics so that it will detect how higher to use their features and to beat their dangers on the subject of the laminated composite materials.

This publication covers many components on the topic of 3D textile cloth applied sciences, and production is taken care of as a key factor. Theoretical features of micro- and macromechanics are coated extensive, in addition to houses and behavior. particular recommendations together with braiding, sewing and knitting are defined and in comparison so as to overview the main appealing configurations to be had for the time being. current and destiny functions and developments are defined to demonstrate that three-D textiles are a part of the true commercial international not just this day yet the next day to boot.

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Extra resources for 3-D Textile Reinforcements in Composite Materials

Sample text

While autoclave prepreg technology is the most important technique for aerospace components, injection moulding and pressing techniques (SMC, GMT) are used for high-volume applications. The reason is that the autoclave prepreg technique results in large fibre volume fractions (typically 60%) and high performance. On the other hand, there is a penalty in the form of extremely high cycle times, typically lasting several hours. SMC, GMT and injection moulding techniques allow cycle times of less than one minute.

22 Low-pressure turbine blade. 23 Hypothetical turbine blade showing finite element mesh for Fig. 22. 3. 4. 65 ¥ 10-6 respectively. With the stiffness matrix generated according to the input material and geometric properties, one can examine the response of the 3-D composite system to a given thermomechanical condition. For a fixed boundary condition on the bottom surface of the blade, assuming a 1000 °C operating temperature and a rotational speed of 4500 rpm, we can evaluate the centrifugal force field as well as the displacement contour on the turbine blade.

Although the density of the 3-D fibre structures can be very high, the impregnation speed is more or less higher compared with conventional 2-D structures. The reason for this effect is that the additional fibres in thickness direction form ‘flow channels’ which support resin transfer through the thickness. The continuous pultrusion process is of greatest interest for the impregnation of profile-shaped fibre preforms with a constant cross-section. Interesting developments are performed, especially in combination with 3-D braiding.

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