An apparatus for fatigue-testing of fibres

Bunsell, Anthony R.; Hearle, J. W. S.; Hunter, Ronald D.

doi:10.1088/0022-3735/4/11/017

Cited by 72 publications

(26 citation statements)

References 6 publications

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“…number of chemical bond per volume unit). The rather large strains obtained with some of these fibres under imposed strain conditions has required the use of a Universal Fibre Tester described in refs [10][11][12] with a fixed grip and a mobile grip (Fig. 2a).…”

Section: Methodsmentioning

confidence: 99%

“…[13] for a review) and recently used for silk fibres [15]. The baseline was first removed with Labspec™ (Dilor, France) and the spectra were decomposed with the ORIGIN™ software (MICROCAL™ Software, Inc., USA) as described in previous papers [11,12,16,17]. The following assumptions are made : a single Raleigh line, Lorentzian shape for narrow peaks and a Gaussian form for broad peaks The Raman fingerprint of air (series of narrow peaks near 60 cm -1 ) is used as an internal standard and the fitting of these peaks is mandatory to describe precisely the Rayleigh wings.…”

Section: Methodsmentioning

confidence: 99%

“…Emphasis is given to the comparison across the fibre of the structural differences between the fibre core and surrounding skin and to understanding the transformations induced by "cold" drawing of a "precursor" (large diameter fibres taken just after the spinneret before final drawing). Single fibres were mounted in the grips and were loaded in a Universal Fibre Tester [12], and the fibres were submitted to different strain levels up to their fracture and their Raman spectra in situ recorded. In addition, some fibres, which had been broken during fatigue tests, have been analysed at points ahead of the fatigue crack tip.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Micro-Raman study of the fatigue and fracture behaviour of single PA66 fibres: Comparison with single PET and PP fibres

Colomban

Ramirez

Paquin

et al. 2006

Engineering Fracture Mechanics

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Micro-Raman study of the fatigue and fracture behaviour of single PA66 fibres: Comparison with single PET and PP fibres

Colomban

Ramirez

Paquin

et al. 2006

Engineering Fracture Mechanics

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“…Single fibres were mounted in the grips and were loaded in a Universal Fibre Tester, described elsewhere, 12,27 and the fibres were submitted to different strain levels. The principle objective was to perform very accurate mechanical measurements on single fibres.…”

Section: Techniquementioning

confidence: 99%

Micro‐Raman study of the fatigue fracture and tensile behaviour of polyamide (PA 66) fibres

Ramirez

Colomban

Bunsell

2004

J Raman Spectroscopy

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The micro/nano structural evolution of two different types of ultra-high-performance polyamide (PA) 66 fibres, before and after tensile fatigue loading and failure, was studied using Raman spectroscopy. The nanostructure of these PA fibres consists of amorphous and crystalline domains. Two probes were considered: (i) low-wavenumber collective modes at ∼100 and ∼70 cm −1 as representative of the crystalline and amorphous domains, respectively; and (ii) N-H stretching mode at ∼3300 cm −1 , as representative of the inter-chain behaviour. The analysis of the wavenumber distribution revealed that the skin/core heterogeneity is a maximum for the amorphous domains. The residual stress in the skin was evaluated at about 200 and 400 MPa from calibrations plots for crystalline and amorphous domains, for the two types of fibres. This stress disappears after thermal treatment around T g . In situ analysis at different strain levels shows that the amorphous regions accommodate the stress up to ∼350 MPa, from which point elastic behaviour is observed. The analysis of a series of fibres failed in fatigue showed that amorphous domains are highly stressed during the failure and remnant compression can be measured. The extent of the stressed region extends to typically 100-400 µm from the fracture. Examination of the N-H wavenumber shift shows that the fracture squeezes the polymer chains together. Fatigue failure is explained by the loss of compliance in the amorphous region.

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“…Despite the sophistication of the analyses and the suggestion that a fatigue process occurred in polyamide and polyester fibres, the results remained ambiguous because of the difficulties associated with conducting sufficiently controlled fatigue tests on such fine fibres. The experimental difficulties were overcome at the beginning of the 1970s and load-controlled fatigue tests became possible with a resolution of 0.1 g [2].…”

mentioning

confidence: 99%