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Orientation of Reinforcement

RPs behavior is dominated by the arrangement and the interaction of the stiff, strong reinforcing fibers with the less stiff, weaker plastic matrix. The fiber arrangement determines the behavior of RPs where a major advantage is that directional properties can be maximized. Arrangements include the use of woven (with different weaves) and nonwoven (with different lengths and forms) fabrics. [Pg.115]


Sophisticated stmctural analysis techniques make it possible to determine both the amount and exact orientation of reinforcement that the product wQl need to meet the critical stresses in actual service. Hybrid reinforcement systems containing different fiber compositions with different properties are being increasingly used. For example, hybrid carbon and glass fiber automotive drive shafts are in commercial use. [Pg.96]

Like other composite properties, the wear resistance is influenced by the orientation of reinforcing fibres. Sung and Suh found that with biaxially-oriented glass fibre and molybdenum disulphide in a PTFE matrix (Duroid 5813), the wear resistance was greatest when the highest proportion of fibre was normal to the sliding surface. The same effect was found with a graphite fibre/epoxy composite and a Kevlar fibre/epoxy composite. [Pg.214]

In general, moisture diffusion in a composite depends on factors such as volume fraction of fibres, void volume, additives, orientation of reinforcement, nature of fibre (that is permeable or impermeable). [Pg.446]

It is also found that the orientation coefficient of these macroscopic fibers along the melt flow direction increases with the addition of LCPs. This can be attributed to the decrease of the melt viscosity. Favored orientation of reinforcing fibers leads to high anisotropy of final materials, which can be taken as a disadvantage if isotropy of the materials is needed. By working with in situ composites, novel technologies have been developed to decrease the anisotropy of final composites [151-156]. These approaches can also be utilized in the case of the in situ hybrid composite, due to their similarity to the in situ composite. [Pg.219]

Tool design and manufacture is a very expensive business, and before a design is committed to it prototypes will usually be made and tested. They are made by machining from solid material of the same type as that proposed for the injection-moulded product, if available. Some care has to be exercised in results of tests on prototypes made in this way, because orientation of reinforcing fibres, or of polymer molecular chains in machined gears may be inconsistent with those in mouldings. [Pg.56]

The higher-order structures (morphologies) of injection-molded polypropylene (PP), which should be considered, are crystalline form, lamellar thickness, spherulite size, crystallinity, molecular orientation, crystal orientation, dispersion state of a blended polymer, length and orientation of reinforcing fibers, crystalline texture (skin-core structure), etc. [Pg.519]

The stiffness of polymer-based composite systems depends on numerous factors such as the stiffness of constituents, the volume fraction of each component, and the size, shape and orientation of reinforcements. As a whole there are three distinct types of polymer composites continuous fibre-reinforced polymer composites, short fibre-reinforced polymer composites, and polymer nanocomposites. Theoretical models based on micromechanical models are well developed and provide an adequate representation of composite stiffness. These micromechanical models are formulated based on assumptions of continuum mechanics. However, for nanocomposite materials, with fillers of size approximately 1 nm compared to the typical carbon fibre diameter of 50 tm, the rules and requirements for continuum... [Pg.300]


See other pages where Orientation of Reinforcement is mentioned: [Pg.51]    [Pg.41]    [Pg.468]    [Pg.2717]    [Pg.2694]    [Pg.125]    [Pg.701]    [Pg.701]    [Pg.295]    [Pg.320]    [Pg.132]    [Pg.115]    [Pg.1929]   


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Orientation reinforcement

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