Dielectric and friction behaviour of unidirectional glass fibre reinforced epoxy (GFRE)

Kchaou, B.; Turki, C.; Salvia, Michelle; Fakhfakh, Z.; Tréheux, D.

doi:10.1016/j.wear.2008.01.015

Cited by 22 publications

(21 citation statements)

References 19 publications

(43 reference statements)

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“…3 The massive detrapping of the trapped charges leads to a sudden depolarization of the dielectric medium: all the stored polarization energy is suddenly released inducing wear mechanisms. 4 Previous studies on the friction behavior of GFRE industrial composites 5,6 have shown that a strong capacity to trap charges along the fiber/matrix interface, inducing significant storage of polarization energy, involves an increase in the friction coefficient of the composite and in wear.…”

Section: Introductionmentioning

confidence: 99%

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Role of fiber/matrix interphases on dielectric, friction, and mechanical properties of glass fiber-reinforced epoxy composites

Kechaou

Salvia

Benzarti

et al. 2011

Journal of Composite Materials

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This study compares the mechanical, tribological, and dielectric properties of glass fiber-reinforced epoxy (GFRE), presenting various fiber/matrix adhesions. Three GFRE composites were studied. The only difference between them is in the initial preparation of fibers which is intentionally simplified compared to the complex sizings used in industry. Thus, fibers treated with aminosilane or silicone coupling agents were compared with fibers simply washed with deionized water. The dielectric measurements show the leading role of interfacial bonding in the trapping or diffusion of electric charges. To obtain high mechanical properties, a fiber treatment that contributes to the diffusion of electric charges along the fiber/matrix interface is preferred. In addition, after friction, a modification of the dielectric properties in all materials is observed, and the trapping or the diffusion of the charges along the interfaces can make it possible to lower the friction coefficient, or the wear

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Section: Introductionmentioning

confidence: 99%

“…Such an approach has been widely validated not only on ceramic materials, 3,4 but also on polymers 10,11 and composites. 2,5,6 …”

Section: Introductionmentioning

confidence: 99%

Role of fiber/matrix interphases on dielectric, friction, and mechanical properties of glass fiber-reinforced epoxy composites

Kechaou

Salvia

Benzarti

et al. 2011

Journal of Composite Materials

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“…In fact, both mechanical and dielectric catastrophic effects could be due to the trapping-detrapping of electric charges on intrinsic or extrinsic structural defects [13,14]. Previous papers have shown the significant role of the fibre/matrix interface (glass fibre E/epoxy matrix), on the motion of the electric charges related to the interface nature: a material that favours the diffusion of electric charges along interfaces has better mechanical and tribological properties [17,18]. In this study, this approach is applied and focuses on composites with isotactic polypropylene (iPP) organic matrix reinforced by hemp natural fibres, fabricated by a new dry impregnation process.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and dielectric characterization of hemp fibre reinforced polypropylene (HFRPP) by dry impregnation process

Kechaou¹,

Salvia²,

Beaugiraud³

et al. 2010

Express Polym. Lett.

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Abstract. Natural fibres such as jute, coir, sisal, bamboo and pineapple are known to have high specific strength and can be effectively used in composites in various applications. The use of hemp fibres to reinforce the polymer aroused great interest and expectations amongst scientists and materials engineers. In this paper, composites with isotactic polypropylene (iPP) matrix and hemp fibres were studied. These materials were manufactured via the patented FIBROLINE process based on the principle of the dry impregnation of a fibre assembly with a thermoplastic powder (iPP), using an alternating electric field. The aim of this paper is to show the influence of fibre/matrix interfaces on dielectric properties coupled with mechanical behaviours. Fibres or more probably the fibre/matrix interfaces allow the diffusion of electric charges and delocalise the polarisation energy. In this way, damages are limited during mechanical loading and the mechanical properties of the composites increase. The structure of composite samples was investigated by X-ray and FTIR analysis. The mechanical properties were analysed by quasistatic and dynamic tests. The dielectric investigations were carried out using the SEMME (Scanning Electron Microscope Mirror Effect) method coupled with the measurement of the induced current (ICM).

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“…Several composites of epoxy reinforced with carbon fabric were fabricated with different processes [18]. The role of the electric charges on the friction behavior of non-conductive materials was confirmed [19]. This correlation is proven using tribo-tests and SEMME (Scanning Electron Microscope Mirror Effect) measurements carried out on the neat epoxy matrix and on two polymeric composites, which only differ by the sizing of the fibres.…”

Section: Introductionmentioning

confidence: 74%

Tribological behaviour of proposed polymeric bearing materials

Khashaba

Eatemad

Youssef

et al. 2013

Materialwissenschaft Werkst

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The aim of the present work is to introduce new polymeric bearing materials. The proposed polymeric composites are consisting of polyethylene (PE), polypropylene (PP) and polystyrene (PS) and filled by fibres of polytetrafluoroethylene (PTFE) in concentration up to 25 wt.% as well as different types of natural oils such as (corn oil, olive oil, paraffin oil, glycerin oil, castor oil and sunflower oil) in concentration up to 10 wt.%. The frictional behavior of the proposed composites and wear resistance are investigated at different values of applied load. Based on the experimental observations, it was found that for composites free of oil, friction of PS and PE specimens decreased, while friction of PP specimens slightly increased with increasing PTFE content. PP composites filled by corn oil showed slight friction increase. Besides, friction coefficient displayed by PS and PE specimens filled by glycerin oil decreased with increasing oil content, while friction coefficient displayed by PP specimens showed consistent trend. It was noted that, PE filled with 7.5% glycerin oil and 20 wt.% PTFE displayed the minimum value of friction coefficient (0.07). This friction coefficient values recommend those composites to be used as bearing materials. PE filled by glycerin oil displayed relatively lower friction values due its common known good lubricating property. Friction of PE composites filled by paraffin oil drastically decreased with the increasing oil content. PP composites showed the lowest wear values. In addition to that, it was shown that wear displayed by composites filled by glycerin oil was higher than that containing corn oil, while wear of the tested composites filled with olive oil showed lower values than that displayed by corn oil filled composites. Composites containing 5.0 -7.5% paraffin oil content showed good wear resistance which recommends them to be used as bearing material. Wear of PP, PS and PE composites filled with sunflower oil and 15 wt.% PTFE drastically decreased with increasing oil content. The minimum wear was displayed by PP and PE composites filled with 10% oil content.

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Dielectric and friction behaviour of unidirectional glass fibre reinforced epoxy (GFRE)

Cited by 22 publications

References 19 publications

Role of fiber/matrix interphases on dielectric, friction, and mechanical properties of glass fiber-reinforced epoxy composites

Role of fiber/matrix interphases on dielectric, friction, and mechanical properties of glass fiber-reinforced epoxy composites

Mechanical and dielectric characterization of hemp fibre reinforced polypropylene (HFRPP) by dry impregnation process

Tribological behaviour of proposed polymeric bearing materials

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