Limitation induced by electrical charges effects on micromechanisms

Guerret‐Piécourt, C.; Vallayer, J.; Tréheux, D.

doi:10.1016/s0043-1648(03)00299-0

Cited by 14 publications

(7 citation statements)

References 42 publications

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“…This answers another open question in the literature (“What is the quantitative part of the electrostatic forces in surface forces compared to other contributions?”27), since friction coefficients in charged polymer surfaces are many times larger than in the absence of charge.…”

Section: Discussionmentioning

confidence: 63%

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Friction coefficient dependence on electrostatic tribocharging

Burgo

Silva

Balestrin

et al. 2013

Sci Rep

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Friction between dielectric surfaces produces patterns of fixed, stable electric charges that in turn contribute electrostatic components to surface interactions between the contacting solids. The literature presents a wealth of information on the electronic contributions to friction in metals and semiconductors but the effect of triboelectricity on friction coefficients of dielectrics is as yet poorly defined and understood. In this work, friction coefficients were measured on tribocharged polytetrafluoroethylene (PTFE), using three different techniques. As a result, friction coefficients at the macro- and nanoscales increase many-fold when PTFE surfaces are tribocharged, but this effect is eliminated by silanization of glass spheres rolling on PTFE. In conclusion, tribocharging may supersede all other contributions to macro- and nanoscale friction coefficients in PTFE and probably in other insulating polymers.

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Section: Discussionmentioning

confidence: 63%

“…A careful recent work on this subject closes by stating some questions, and the following one clearly presents the problem: “What are the mechanisms of the charging phenomena, of charge trapping-detrapping and of charge movement? Is this related to stresses in the material under pressure or during rubbing27?”…”

mentioning

confidence: 99%

Friction coefficient dependence on electrostatic tribocharging

Burgo

Silva

Balestrin

et al. 2013

Sci Rep

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“…on the mechanical properties (such as friction, wear, fracture etc.) of ceramics and polymers [13][14][15][16]. 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].…”

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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“…12,13,17,[23][24][25] Indeed, all the materials, in particular the insulators, during contacts are subject to the developing of electrical charges and the appearance of electric fields. [26][27][28] In fact, during friction, excess electric charges are injected into an insulator. These charges can diffuse in the material or can be trapped at sites which, in ceramics, correspond to local or longer range structural defects (point defects, grain boundaries, dislocation).…”

Section: Introductionmentioning

confidence: 99%