Effect of short fibre reinforcement on the fatigue crack propagation and fracture of PEEK-matrix composites

Friedrich, K.; Walter, Rolf; Voß, Heinrich; Karger‐Kocsis, J.

doi:10.1016/0010-4361(86)91004-9

Cited by 108 publications

(45 citation statements)

References 6 publications

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“…Stress/strain curves of the short-glass-®bre-reinforced polypropylene composites used in the present study. [19], and poly(ether ether ketone) [20,21]. Studying the in¯uence of short-®bre orientation on the FCP rates of injection-moulded nylons, Wyzgoski and Novak showed that the use of a strain-energy release rate model provided a superior representation of the results since it led to a generalized plot for di erent glass-®bre orientation directions [9,13].…”

Section: E Ect Of ®Bre Contentmentioning

confidence: 99%

Fatigue crack propagation in polypropylene reinforced with short glass fibres

Pegoretti

Riccò

1999

Composites Science and Technology

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Section: E Ect Of ®Bre Contentmentioning

confidence: 99%

Fatigue crack propagation in polypropylene reinforced with short glass fibres

Pegoretti

Riccò

1999

Composites Science and Technology

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“…It can explain the unexpectedly high resistance to rolling contact fatigue of this material. In fact, crack propagation along a direction perpendicular to that of the fibers is more difficult than that happening along the fibers direction, as demonstrated by crack growth tests carried out by Friedrich et al [4] on the same material typology. A delamination mechanism on the roughness scale is also present in form of flakes, as clearly visible in Figure 7.…”

Section: -P5mentioning

confidence: 79%

Rolling contact fatigue testing of peek based composites

Avanzini

Donzella

Gallina

et al. 2010

EPJ Web of Conferences

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Abstract. Rolling contact fatigue phenomenon was investigated on unfilled PEEK and on three different PEEK composites: 10% carbon micro-fiber, graphite and PTFE filled matrix, 30% carbon micro-fiber filled matrix, 30% glass micro-fiber filled matrix. For this aim, roller-shaped specimens were machined from extruded bars of these materials and subjected to rolling contact tests at different contact pressure levels by means of a four roller machine. Contact pressure-life diagrams and wear rates were so obtained and compared, highlighting a relationship with monotonic and hardness materials properties. Microscopic observations of contact surfaces and transversal section of the specimens also allowed observing the damage mechanisms occurred in the materials tested and the effects of the filler. In particular way, deep radial cracks appeared on unfilled PEEK, while spalling and delamination phenomena where found on composites. Diffuse microcracks were found at the filler-matrix interface of the composites specimens, confirming that the fatigue life of these materials is essentially determined by the crack propagation phase, also under rolling contact loading.

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“…In fact it has been reported that as the fiber volume fraction increases the fracture toughness can either increase, like in the case of SGF reinforced PES [24], or remain constant, as for SGF reinforced PEEK [21], or even decrease, like for SGF reinforced PTFE [25]. Results of the fracture toughness measurements are reported in Figure 3 for the materials under investigation.…”

Section: Materials Propertiesmentioning

confidence: 89%

“…Such orientation phenomena are responsible for anisotropic mechanical properties due to macromolecules partial alignment and/or, in the case of SFR composites, due to fiber preferred orientation. The effect of fiber partial alignment on the FCP behavior of SFR composites has been examined by a number of authors on several kinds of thermoplastic matrices such as polypropylene [2,5], polyamide [13][14][15][16][17][18][19], polyethylene [20], polyetheretherketone [21,22], polybutylenterephthalate [23], polyethersulphone [24], and polytetrafluoroethylene [25]. In all cases the FCP resistance results to be enhanced by the presence of fibers, particularly when they are preferentially aligned transversely to the crack growth direction.…”

Section: Introduction Imentioning

confidence: 99%

Fatigue Fracture of Neat and Short Glass Fiber Reinforced Polypropylene: Effect of Frequency and Material Orientation

Pegoretti

Riccò

2000

Journal of Composite Materials

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ABSTRACT:The influence of glass fibers content and testing conditions (frequency and mean load) on the fatigue crack propagation rate in injection molded neat and fiber reinforced polypropylene has been investigated. The resistance to fatigue crack propagation increases as the fiber volume fraction increases. The fatigue resistance of either neat and fiber reinforced polypropylene is tremendously dependent on the crack propagation direction, with higher values for crack propagating transversely to the melt flow direction in the molded plaques. A dramatic increase of the crack growth rate per cycle by decreasing frequency, at any given crack length was found for all the materials investigated. Analysis of data obtained at various frequencies and applied mean loads suggests that crack propagation is determined mostly by viscoelastic creep processes at the crack tip, the role of pure fatigue appearing quite secondary.

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Effect of short fibre reinforcement on the fatigue crack propagation and fracture of PEEK-matrix composites

Cited by 108 publications

References 6 publications

Fatigue crack propagation in polypropylene reinforced with short glass fibres

Fatigue crack propagation in polypropylene reinforced with short glass fibres

Rolling contact fatigue testing of peek based composites

Fatigue Fracture of Neat and Short Glass Fiber Reinforced Polypropylene: Effect of Frequency and Material Orientation

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