The measurement of transverse mechanical properties of polymer fibres

Kotani, T.; Sweeney, J.; Ward, I. M.

doi:10.1007/bf00349946

Cited by 25 publications

(18 citation statements)

References 8 publications

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“…The level of uncertainty is similar to reports in other transverse compressive tests on polymer fibers and monofilaments [4,16,17]. This suggests that the uncertainty may be dominated by local variations in the fiber transverse response along the fiber length more than the uncertainty of this test device.…”

Section: Discussionsupporting

confidence: 79%

Transverse compression of PPTA fibers

Singletary¹

2000

Mech Compos Mater

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Section: Discussionsupporting

confidence: 79%

Transverse compression of PPTA fibers

Singletary¹

2000

Mech Compos Mater

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“…The method was first demonstrated for fibres by Hadley et al [10], who used experimental load-displacement measurements to determine the transverse elastic moduli of poly(ethylene terephthalate), polyamide and polypropylene monofilaments. This technique has since been applied to study the transverse compression properties of numerous high-performance fibres including carbon fibre [2,11,12], graphite [13], Kevlar and other aramids [1][2][3][13][14][15][16], polyesters [13,[17][18][19], polyamides [13,14,17,19,20], polypropylene [17] and ceramic fibres [2,14].…”

Section: Introductionmentioning

confidence: 99%

Determination of the transverse modulus of cylindrical samples by compression between two parallel flat plates

et al. 2019

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Over the last century, several different theoretical models have been proposed for the calculation of the transverse modulus of fibres or cylinders from compression experiments. Whilst they all give similar results, the differences are significant enough to cause errors in computer simulation predictions of composite properties, and hence the issue warrants further investigation. Two independent approaches were applied to clarify this. Firstly, using an experimental approach, compression tests have been carried out on model elastic cylinders of poly(methyl methacrylate) as well as cuboids machined from the cylinders. The transverse modulus of this hard elastic material was determined directly from compression experiments on the cuboids and by analysis using different models for the cylinder compression data. Since machining was shown to change the modulus by virtue of relieving stresses in the samples, comparison was made between cuboids and machined cylinders. The transverse modulus obtained by direct compression of the cuboids was statistically equivalent to that obtained from the cylinders using the Morris model and was within 8% of the value obtained using the model derived by Jawad and Ward, as well as the mathematically equivalent models derived by Phoenix and Skelton and Lundberg. Finally, the separate and independent approach of finite element numerical modelling was also utilised. The finite element approach gave results that lie between the Jawad and Ward and Morris models. The close agreement in the outcomes of the finite element modelling and the experimental approach leads to the conclusion that the most accurate of the different analytical models are the equations by Morris as well as those due to Jawad and Ward, Phoenix and Skelton and Lundberg.

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“…This experiment is commonly called “Brazilian” test or single fiber transverse compression test (SFTCT) . Conducting such experiments on small diameter polymer fibers is challenging because (1) their small diameter and low modulus make the test specimen very compliant per unit length, (2) tests require accurate alignment and measurement of platen displacement, especially taking account of displacement drifts during loading/unloading, (3) the experiment is sensitive to the geometry of the contact between fiber, and platen and consequently on variations in fiber diameter . The SFTCT of Kevlar fibers has been investigated by several authors .…”

Section: Introductionmentioning

confidence: 99%

Multiaxial mechanical behavior of aramid fibers and identification of skin/core structure from single fiber transverse compression testing

Wollbrett-Blitz

Joannès

Bruant

et al. 2015

J. Polym. Sci. Part B: Polym. Phys.

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International audienceThe transverse and longitudinal mechanical properties of aramid fibers like Kevlar™ 29 (K29) fibers are strongly linked to their highly oriented structure. Mechanical characterization at the single fiber scale is challenging especially when the diameter is as small as 15 µm. Longitudinal tensile tests on single K29 fibers and single fiber transverse compression test (SFTCT) have been developed. Our approach consists of coupling morphological observations and mechanical experiments with SFTCT analysis by comparing analytical solutions and finite element modeling. New insights on the analysis of the transverse direction response are highlighted. Systematic loading/unloading compression tests enable to experimentally determine a transverse elastic limit. Taking account of the strong anisotropy of the fiber, the transverse mechanical response sheds light on a skin/core architecture. More importantly, results suggest that the skin of the fiber, typically representing a shell of one micrometer in thickness, has a transverse apparent modulus of 0.2 GPa. That is around more than fifteen times lower than the transverse modulus of 3.0 GPa in the core. By comparison, the measured longitudinal modulus is about 84 GPa. The stress distribution in the fiber is explored and the critical areas for damage initiation are discussed

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The measurement of transverse mechanical properties of polymer fibres

Cited by 25 publications

References 8 publications

Transverse compression of PPTA fibers

Transverse compression of PPTA fibers

Determination of the transverse modulus of cylindrical samples by compression between two parallel flat plates

Multiaxial mechanical behavior of aramid fibers and identification of skin/core structure from single fiber transverse compression testing

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