Nylon fibre reinforcement

Carbon-fibre-reinforced nylon 6 and nylon 6/12 mixtures have been offered commercially and found use in aerospace md tennis racket applications. 

A wide variety of thermoplastics have been used as the base for reinforced plastics. These include polypropylene, nylon, styrene-based materials, thermoplastic polyesters, acetal, polycarbonate, polysulphone, etc. The choice of a reinforced thermoplastic depends on a wide range of factors which includes the nature of the application, the service environment and costs. In many cases conventional thermoplastic processing techniques can be used to produce moulded articles (see Chapter 4). Some typical properties of fibre reinforced nylon are given in Table 3.2. 

In a short carbon fibre reinforced nylon moulding the volume ffacdon of the fibres is 0.2. Assuming the fibre length is much greater that the critical fibre length, calculate the modulus of the moulding. The modulus values for the fibres and nylon are 230 GN/m and 2.8 GN/m respectively. 

In all cases, carbon fibres lead to the highest mechanical performances compared to glass and aramid fibres. Nevertheless, their impact behaviour and price restrict their consumption. Glass fibres yield the cheapest composites but performances are more limited. Table 6.10 compares the properties of the main fibre types and shows some examples of properties for a nylon matrix reinforced with short fibres of the three types. 

For a 40% glass fibre reinforced nylon, all other things being equal, a relative change of 10% in the actual glass fibre level at a specific spot leads to a tensile strength change of about 6%. 

Isothermal and dynamic DSC were demonstrated to be useful tools for following the oxidative stability as a function of repeated injection moulding of glass fibre reinforced nylon [121]. Similarly DSC and OIT showed that a common feature for PP and HDPE is that the OIT sharply decreases after the two first extrusion steps due to the large amount of antioxidant initially con-... 

FRACTURE BEHAVIOUR OF SHORT GLASS FIBRE-REINFORCED RUBBER-TOUGHENED NYLON COMPOSITES... 

Abstract The effects of the amount of rubber, the concentration of fibres and the state of the fibre/matrix interface upon the mechanical behaviour of short glass fibre-reinforced rubber-toughened nylon 6 ternary blends are described. First, tensile tests were carried out on different intermediate materials and then on the ternary blends to derive the stress-strain curves and document the damage mechanisms. Fracture toughness tests were implemented on compact tension specimens and the results were correlated to fractographic observations and acoustic emission analysis to assess the role of the different constituents. 

Fibre-reinforced thermoplastics, such as glass fibre-reinforced nylon, are increasingly used as substitute for wood, metallic or ceramic materials in applications for which high strength and temperature are not decisive parameters. They are being incorporated into components in the automotive, naval, sport and leisure industries due to the potential of reduced production costs of lighter parts and recycling possibilities. 

The purpose of this investigation is to determine the effects of the rubber, the fibre concentration and the state of fibre/matrix interface upon the damage and fracture behaviour of short glass fibre-reinforced nylon-based materials. 

Fracivre Behaviour of Short Glass Fibre-Reinforced Rubber- Toughened Nylon Composites 401... 

Glass fibre-reinforced nylon 6 effects of the fibre concentration and the state offibre/matrix interface. 

Fig. 5 (a) Schematic representation of the fibres arrangement across the thickness of the. tO wt% fibre-reinforced nylon, the melt filling direction is indicated view of the fibre orientation in (b) the skin and (c) the core regions. 

Fig. 6 Influence of the concentration of fibres and state of fibre/matrix interface on the uniaxial tensile stress-strain curves of fibre-reinforced nylon composites (a) type A interface (b) type B interface.

Glass fibre-reinforced rubber-toughened nylon 6... 

When bonding compounded rubber to fabric, for the manufacture of fabric reinforced expansion joints in the chemical plant piping systems, mechanical anchoring between cotton/Nylon/fibre and compounded rubber should be sufficient to ensure good adhesion. Synthetic fibres require treatment with chemical coatings to secure maximum adhesion and bond [8, 9]. 

Has Hashemi, S., Mugan, J. Fracture mechanics of short glass fibre-reinforced nylon composite. J. 

A) DSC isothermal crystallization curves of carbon fibre-reinforced nylon 6 composite. At the lowest isothermal crystallization temperature nucleation occurs too rapidly to be accurately measured and must be inferred from the shape of the crystallization exotherm (dashed line). (B) The corresponding log-log plot, based on equation 5.28, from which the coefficient n can be calculated... 

F. Navarro-Pardo, G. Martinez-Barrera, A.L. Martinez-Hernandez, V.M. Castano, J.L. Rivera-Armenta, F. Medellin-Rodriguez, et al.. Nylon 6,6 elec-trospun fibres reinforced by amino functionalised ID and 2D carbon. lOP Conference Series Materials Science and Engineering, 40,012023, 2012. 

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