Fracture resistance of short glass and carbon fibre/polyamide 6.6 composites

Malzahn, J.C.; Friedrich, K.

doi:10.1007/bf00719573

Cited by 28 publications

(8 citation statements)

References 3 publications

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“…Friedrich has noted that the toughness of brittle matrices is enhanced more extensively by the addition of fibers than for the case of ductile matrices (1)(2)(3)(4)(5)(6). The results of this investigation confirm Friedrich's findings, and offer a rationalization in terms of a competition between strength and effective blunting.…”

Section: Discussionmentioning

confidence: 99%

“…he addition of short glass fibers can improve the T toughness response of certain engineering polymers. However, such toughness improvements are less extensive with ductile matrices than with brittle matrices: indeed, when fibers are added to very ductile matrices, toughness values may actually decrease (1)(2)(3)(4)(5)(6). It has been speculated that ductile matrices are not constrained by the addition of fibers and, therefore, associated toughness values do not change with fiber content (1,7).…”

Section: Introductionmentioning

confidence: 99%

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The fracture behavior of rubber‐toughened, short‐fiber composites of nylon 6,6

Pecorini

Hertzberg

1994

Polymer Composites

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This study critiques the use of both rubber particles and short-glass fibers for the improvement of polymer fracture toughness ( K ). Although dry neat nylon is brittle with only a moderate K , value (4.2 M P a g ) , additions of either second phase produce rising K,-curves and associated high K , values (8.1 M P a 6 for rubber-toughened nylon, and 10.0 M P a G for 17 vol% glass-fiber neat nylon). In the rubber-modified resin, the high K, value is associated with extensive plastic blunting at the crack tip. In the fiber-reinforced neat resin, K, is improved due to a combination of fiber-bridging and increased strength, the latter being associated with additional load carrying capacity of the fibers. When both rubber and fibers are added, however, no further increase in K, is noted ( K , = 9.3 M P a 6 for 17 vol% glass-fiber rubber-modified nylon). The extent of ductile blunting in the rubber + fiber resin is not as great as in the rubber-only resin. Furthermore, the fracture strength of the rubber + fiber resin is not as high as the fiber-only resin.The net result is a balance of properties for the rubber-toughened composite.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The fracture behavior of rubber‐toughened, short‐fiber composites of nylon 6,6

Pecorini

Hertzberg

1994

Polymer Composites

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“…Polymer composites reinforced with short fibers are used increasingly in a variety of industrial applications owing to their high stiffness, high strength‐to‐weight ratios, and ease of processing. Their properties can be tailored according to the types of reinforced fibers and matrix materials used 1–5. The use of natural fibers such as wood, jute, pineapple, sisal and cotton in polymeric composites have received considerable attention recently.…”

Section: Introductionmentioning

confidence: 99%

Composites based on maleated polypropylene and methyl cellulosic fiber: Mechanical and thermal properties

Tjong

1999

J. Appl. Polym. Sci.

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ABSTRACT:Composites based on maleated polypropylene and methyl cellulosic fiber were prepared by extrusion followed by injection molding. The methyl cellulosic fiber was pretreated with tetrabutyl orthotitanate prior to compounding. The mechanical and thermal properties, as well as morphology of composites, were investigated by means of tensile, impact, dynamic mechanical analysis, thermogravimetric measurements, and scanning electron microscopy. Static tensile tests showed that the stiffness and tensile strength of composites tend to increase with increasing fiber content. However, the elongation at break appeared to decrease with increasing fiber content. In contrast, the impact strength of composites increased slightly with increasing fiber content. The improvements in tensile and impact properties were attributed to the interaction between the functional group of maleic anhydride and tetrabutyl orthotitanate. Such interaction tended to improve the interfacial bonding between the methyl cellulosic fiber and polypropylene matrix. Thermogravimetric measurements revealed that the incorporation of methyl cellulosic fiber into maleated polypropylene results in a marked reduction of thermo-oxidative stability. The effects of coupling agent additions on the mechanical properties of composites are discussed.

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“…However, it has been reported that the The Ozawa equation is generally used to describe the nonisothermal crystallization behavnotched impact toughness and the plane strain fracture toughness (K IC ) of the thermoplastics can ior of polymers, be increased markedly by adding a sufficient amount of glass fibers, i.e., above 30 wt %. 27,28 The…”

Section: Impact Properties Fractographymentioning

confidence: 99%

Rheology and impact characteristics of compatibilized polypropylene-liquid crystalline polymer composites

Tjong

1998

J. Appl. Polym. Sci.

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Polypropylene-liquid crystalline polymer (PP/LCP) and maleic anhydride compatibilized PP/LCP blends were prepared using the extrusion technique followed by injection molding. The LCP employed was Vectra A950 which consists of 25 mol % of 2,6-hydroxynaphthoic acid and 75 mol % of p-hydroxybenzoic acid. The rheology, morphology, and impact behavior of compatibilized PP/LCP blends were investigated. The rheological measurements showed that the viscosity of LCP is significantly higher than that of the PP at 280ЊC. This implied that the viscosity ratio of the LCP to the polymer matrix is much larger than unity. Scanning electron microscopy (SEM) observations revealed that the LCP domains are dispersed mainly into elongated ellipsoids in the PP/LCP blends. However, fine fibrils with large aspect ratios were formed in the compatibilized PP/LCP blends containing LCP content ¢ 10 wt %. The development of fine fibrillar morphology in the compatibilized PP/LCP blends had a large influence on the mechanical properties. The Izod impact strength of the PP/LCP blends showed little dependence on the LCP concentrations. On the other hand, the impact strength of the compatibilized PP/LCP blends was dependent on the LCP concentrations. The correlation between the LCP fibrillar morphology and spherulitic structure with the impact properties of the compatibilized PP/LCP blends is discussed.

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Fracture resistance of short glass and carbon fibre/polyamide 6.6 composites

Cited by 28 publications

References 3 publications

The fracture behavior of rubber‐toughened, short‐fiber composites of nylon 6,6

The fracture behavior of rubber‐toughened, short‐fiber composites of nylon 6,6

Composites based on maleated polypropylene and methyl cellulosic fiber: Mechanical and thermal properties

Rheology and impact characteristics of compatibilized polypropylene-liquid crystalline polymer composites

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