Fatigue and creep failure of organic fibres subjected to cyclic loading

Bunsell, Anthony R.; Oudet, Ch.; Veve, J. Ch.

doi:10.1007/bf01742212

Cited by 5 publications

(1 citation statement)

References 10 publications

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“…5 Processing-induced compressive residual stress on the surface of the fi ber plays an important role in the onset of fatigue damage. Under cyclic loading, the compressive stress leads to buckling of polymer chains at the surface of the fi ber, leading to crack initiation.…”

Section: Polymeric Fibersmentioning

confidence: 99%

The cyclic fatigue of high-performance fibers

Kerr

Chawla

2005

JOM

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High-performance fi bers are virtually ubiquitous in our everyday lives. In a variety of structural applications, fi bers and fi ber-reinforced composites are subjected to cyclic mechanical loading. This paper reviews the fatigue behavior of some common high-performance fi bers such as polymer, metal, and ceramic fi bers. Fatigue mechanisms unique to each type of fi ber are identifi ed and a description of fatigue damage and fracture is provided.

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Section: Polymeric Fibersmentioning

confidence: 99%

The cyclic fatigue of high-performance fibers

Kerr

Chawla

2005

JOM

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Fatigue response and constitutive behavior modeling of poly(ethylene terephthalate) unreinforced and nanocomposite fibers using genetic neural networks

2012

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The constitutive behavior of poly(ethylene terephthalate) (PET) unreinforced (control) and PET fibers reinforced with 5 wt% vapor-grown carbon nanofibers (VGCNFs) under uniaxial tension and subsequent to fatigue loading has been evaluated utilizing various analytical models. Two types of fatigue tests were performed: (1) Long cycle fatigue at 50 Hz (glassy fatigue) to evaluate fatigue resistance and (2) fatigue at 5 Hz (rubbery fatigue) to evaluate residual strength performance. The long cycle fatigue results at 50 Hz indicated that the PET-VGCNF sample exhibited an increased fatigue resistance of almost two orders of magnitude when compared to the PET unreinforced filament. The results of the fatigue tests at 5 Hz indicated that the constitutive response of both the PET control and PET-VGCNF samples changed subsequent to fatigue loading. The large deformation uniaxial constitutive response of the PET and PET-VGCNF fibers was modeled utilizing genetic-algorithm (GA) based training neural networks. The results showed that the large deformation uniaxial tension constitutive behavior of both PET unreinforced and PET-VGCNF samples with and without prior fatigue can be represented with good accuracy utilizing neural networks trained via genetic-based backpropagation algorithms, once the appropriate post-fatigue constitutive behavior is utilized. Experimental data of uniaxial tensile tests and experimental postfatigue constitutive data have been implemented into the networks for adequate training. The fatigue tests were conducted under tension-tension fatigue conditions with variations in the stress ratio (R), maximum stress (σmax), number of cycles (N), and the residual creep strain (εR).

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Influence of temperature on fracture initiation in PET and PA66 fibres under cyclic loading

2007

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International audienceThe fatigue of single thermoplastic fibres has been well documented to occur in a reproducible manner when they are subjected to certain cyclic loading conditions. The fatigue fracture morphologies of these fibres are very distinctive and differ markedly from other types of failure. This type of behaviour, which is clearly seen with the unambiguous tests on single fibres, must reflect behaviour of fibres in more complex structures which are subjected to cyclic loading. Only limited numbers of reports have, however, shown similar fracture morphologies with fibres extracted from fibre bundles embedded in a matrix material such as rubber. Usually the fractured ends of fibres taken from structures are seen to be shorter than those obtained in single fibre tests and also they show more complex and confused crack growth. The present study reveals that the low thermal conductivity of the fibres, exacerbated when they are embedded in a rubber matrix, leads to very high temperature rises, which is not the case in single fibre tests and under these conditions, crack initiation occurs across the fibre section instead of being restricted to the near surface region. Tests on single fibres at temperatures up to and beyond the glass transition temperature have shown how the fracture morphologies become modified. The fatigue process has been seen to become generalised throughout the fibre and failure occurs due to the coalescence of several cracks, some of which are initiated in the core of the fibre. In all cases, the cracks can be seen to have been initiated by solid inclusions in the fibres

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Fatigue and creep failure of organic fibres subjected to cyclic loading

Cited by 5 publications

References 10 publications

The cyclic fatigue of high-performance fibers

The cyclic fatigue of high-performance fibers

Fatigue response and constitutive behavior modeling of poly(ethylene terephthalate) unreinforced and nanocomposite fibers using genetic neural networks

Influence of temperature on fracture initiation in PET and PA66 fibres under cyclic loading

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