Analysis and evaluation of the single-fibre fragmentation test

Copponnex, Thierry

doi:10.1016/0266-3538(96)00049-8

Cited by 15 publications

(7 citation statements)

References 13 publications

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“…The SFFT 26 was performed in order to measure the fibre/matrix interfacial shear strength (IFSS) using the shear-lag model developed by Kelly-Tyson 27,28…”

Section: Characterizationmentioning

confidence: 99%

Thermal and chemical treatments of recycled carbon fibres for improved adhesion to polymeric matrix

Greco

Maffezzoli

Buccoliero

et al. 2012

Journal of Composite Materials

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The aim of this study is the characterization of recycled carbon fibres, in view of their potential application in long-fibre reinforced thermoplastic composite. The fibres were obtained from epoxy matrix composite panels, applying a patented process that includes the pyrolisis of the matrix followed by an upgrading of the fibres. Then, recycled fibres were further subjected to thermal and acid treatments in order to modify their surface morphology and chemistry. Scanning electron microscopy and energy dispersive spectrometry were used to characterize the morphological and compositional changes of the fibre surface. The fibres were characterized in terms of mechanical properties and adhesion to an epoxy matrix. The fibres treated by thermal processes at high temperatures (600°C) were shown to be too severely damaged, making them unsuitable for the production of fibre-reinforced composites. A thermal treatment at lower temperatures (450°C) involved a very limited damaging without any evident chemical modification of the fibre surface, which in turn involved a limited increase of the adhesion properties to an epoxy matrix. Chemical treatment by nitric acid caused a very limited damage of fibres, coupled with a significant modification of surface chemistry, which in turn involved a further increase of the fibre/matrix adhesion properties.

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“…The SFFT 26 was performed in order to measure the fibre/matrix interfacial shear strength (IFSS) using the shear-lag model developed by Kelly-Tyson 27,28…”

Section: Characterizationmentioning

confidence: 99%

Thermal and chemical treatments of recycled carbon fibres for improved adhesion to polymeric matrix

Greco

Maffezzoli

Buccoliero

et al. 2012

Journal of Composite Materials

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“…By recording the overall strain and load on the fiber at saturation, as well as the number of breaks (current practice) and associated fragment lengths, an approximate calculation for the IFSS is obtained using models derived from the 'fiber' free body diagram shown in Figure 1. The limitations of the various micromechanical models developed to calculate the IFSS have been well documented [12][13][14][15][16][17][18][19][20][21][22]. The equation for calculating the IFSS, ߬ , has the following general form:…”

Section: Introductionmentioning

confidence: 99%

The fiber break evolution process in a 2-D epoxy/glass multi-fiber array

McCarthy

Kim

Heckert

et al. 2015

Composites Science and Technology

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The mechanical integrity of a structural composite is strongly affected by the strength and toughness of the fiber-matrix interface/interphase [1], with interfacial shear strength (IFSS) being generally accepted as the best quantifying metric. The value of the IFSS is not directly measurable, but it can be approximated by several micromechanics based test methods with the value obtained being dependent on the choice of the model. The most popular of these test methods is the embedded single fiber fragmentation test (SFFT) which provides the experimental data needed to estimate the IFSS: (a) mean fragment length at saturation and (b) fiber strength at the critical fragment length.Because the IFSS is used in unidirectional composite models to predict strength and failure behavior, where the interaction between fibers can be important, the validity of extrapolating from test results based upon the repeated failure of a single isolated fiber has often been questioned. In this paper, the spatial distribution of fiber breaks in a 2-D array of glass fibers is compared with break locations observed from SFFT specimens. In both cases, the break locations in each fiber were found to evolve to a uniform distribution, thereby confirming that the ordered fragment lengths from the repeated fracture process conforms for both SFFT and multi-fiber fragmentation test (MFFT) specimens to a cumulative distribution function (CDF) derived by Whitworth [2][3][4][5]. The array break density was also observed to be less than the break density in isolated fibers, and break locations across array fibers were observed to be highly coordinated and mostly aligned.

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“…These debonded zones can cover much of the fiber and can transfer shear stress by friction, albeit less effectively. 20,21 The size of these debonded regions is dictated by the fracture toughness of the interface. 22,23 The ability of the interphase to transfer stress from the polymer matrix to the glass fiber was determined by SFFTs.…”

Section: Ifssmentioning

confidence: 99%

Electrostatic deposition of silica nanoparticles between E‐glass fibers and an epoxy resin

Rutz

Berg

2014

J of Applied Polymer Sci

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The achievement of optimum adhesion between a thermoset and an inorganic material is an important goal for the composites and coatings industries. There is a growing interest in the use of structural surface modifiers, such as nanotubes, nanoparticles, and whiskers, to improve this adhesion. Here, a method for electrostatically depositing poly(ethylene imine)-functionalized silica nanoparticles onto E-glass fibers was developed. The deposition of 26-nm functionalized particles onto glycidyloxypropyltrimethoxysilane (GPS)-functionalized E-glass fibers and then their embedding in a resin of diglycidyl ether of bisphenol A and m-phenylene diamine increased the interfacial shear strength (IFSS) 35% over that of bare fibers and 8% over that of GPS-functionalized fibers. IFSS was highly dependent on the particle size; the 16-nm functionalized particles had little effect on the IFSS. When the particles size was increased to 71 and 100 nm, this led to increasingly poor IFSS values, whereas the 26-nm particles produced the best results. Similar results were seen with the transverse flexural strength of the unidirectional composites.

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Analysis and evaluation of the single-fibre fragmentation test

Cited by 15 publications

References 13 publications

Thermal and chemical treatments of recycled carbon fibres for improved adhesion to polymeric matrix

Thermal and chemical treatments of recycled carbon fibres for improved adhesion to polymeric matrix

The fiber break evolution process in a 2-D epoxy/glass multi-fiber array

Electrostatic deposition of silica nanoparticles between E‐glass fibers and an epoxy resin

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