More about fibre friction and its measurements

Yuksekkay, Mehmet Emin

doi:10.1080/00405160903178591

Cited by 24 publications

(15 citation statements)

References 144 publications

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“…Associated with the definition given in literature, 43 the term static means that the frictional behaviour is studied regardless of the sliding. The fabric-fabric frictional behaviour will be also determined for multi-layer analyses.…”

Section: Presentation Of the Carbon Reinforcementmentioning

confidence: 99%

“…In this article, an experimental study is presented to characterise the static frictional behaviour of this carbon fabric with several materials that can be used for tools during the preforming step. Associated with the definition given in literature, 43 the term static means that the frictional behaviour is studied regardless of the sliding. The fabric–fabric frictional behaviour will be also determined for multi-layer analyses.…”

Section: Presentation Of the Carbon Reinforcementmentioning

confidence: 99%

“…38 Several studies 36,38,[39][40][41][42] have shown that the coefficient of friction varies with the applied normal load. Hence, Howell's equation 43 can then be used (equation (2)) instead of the Coulomb law…”

Section: Introductionmentioning

confidence: 99%

“…Several studies 36,38,39–42 have shown that the coefficient of friction varies with the applied normal load. Hence, Howell’s equation 43 can then be used (equation (2)) instead of the Coulomb law where K is an experimentally determined proportionality constant and the exponent m is a fitting parameter related to the deformation mechanism. In these studies, the influence of the relative positioning of the fabric and orientation of the yarns is not taken into account.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of frictional behaviour of carbon dry woven reinforcement

Najjar

Pupin

Legrand

et al. 2014

Journal of Reinforced Plastics and Composites

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During the preforming stage of woven reinforcement, in the first step of the RTM process, frictional phenomenon occurring at the tool/reinforcement interfaces and the reinforcement/reinforcement interfaces is one of the key parameters of the forming process. This behaviour must be correctly taken into account when modelling the process and a better understanding of the contact and friction phenomena occurring during the woven fabric preforming process is necessary for realistic simulation of the preforming process.Although some existing studies concerning friction of reinforcement have been published, the complex frictional behaviour of fabrics is still not completely clear.The experimental characterization of the frictional behaviour of a specific carbon woven reinforcement (G1151) used for aeronautical applications, is the aim of this paper, and three interfaces have been studied (G1151/G1151, G1151/Plexiglas, G1151/Aluminium). The Coulomb coefficients of friction occurring during contact between two layers of fabric and between the fabric and other materials have been determined. The effect of the variation of the normal pressure and the temperature on the frictional behaviour of this reinforcement has also been analysed. Comparisons between several frictional models, described in the literature, are also conducted, associated with these experimental results.This study highlights a significant tribological anisotropy of the G1151 reinforcement and a dependence of the frictional characteristics on the applied pressure and the temperatureInternational audienceDuring the preforming stage of woven reinforcement, in the first step of the RTM process, frictional phenomenon occurring at the tool/reinforcement interfaces and the reinforcement/reinforcement interfaces is one of the key parameters of the forming process. This behaviour must be correctly taken into account when modelling the process and a better understanding of the contact and friction phenomena occurring during the woven fabric preforming process is necessary for realistic simulation of the preforming process.Although some existing studies concerning friction of reinforcement have been published, the complex frictional behaviour of fabrics is still not completely clear.The experimental characterization of the frictional behaviour of a specific carbon woven reinforcement (G1151) used for aeronautical applications, is the aim of this paper, and three interfaces have been studied (G1151/G1151, G1151/Plexiglas, G1151/Aluminium). The Coulomb coefficients of friction occurring during contact between two layers of fabric and between the fabric and other materials have been determined. The effect of the variation of the normal pressure and the temperature on the frictional behaviour of this reinforcement has also been analysed. Comparisons between several frictional models, described in the literature, are also conducted, associated with these experimental results.This study highlights a significant tribological anisotropy of the G1151 reinforcement and a depe...

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Section: Presentation Of the Carbon Reinforcementmentioning

confidence: 99%

Section: Presentation Of the Carbon Reinforcementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of frictional behaviour of carbon dry woven reinforcement

Najjar

Pupin

Legrand

et al. 2014

Journal of Reinforced Plastics and Composites

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“…Thus more complex models were proposed; for example Howell's model (Howell and Mazur, 1953) describes a power law between tangent and normal forces such that F T k F m N where k and m are parameters to be determined experimentally (Das et al, 2005;Cornelissen et al, 2014;Najjar et al, 2014), which leads to a dynamic friction coefficient which depends on the normal force. A review of these models is proposed by Yuksekkay (2009). In the case of dry reinforcements, an inter-ply friction coefficient of 0.3 is frequently assumed (Fetfatsidis et al, 2013) in the absence of experimental data.…”

Section: Inter-ply Friction Behavior Of Reinforcementsmentioning

confidence: 99%

A Contribution to the Study of the Forming of Dry Unidirectional HiTape® Reinforcements for Primary Aircraft Structures

Bouquerel¹,

Moulin

Drapier

2021

Front. Mater.

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In the context of developing competitive liquid composites molding processes for primary aircraft structures, modeling the forming stage of automatically-placed initially flat stacks of dry reinforcements is of great interest. In the case of HiTape®, a dry unidirectional carbon fiber reinforcement designed to achieve performances comparable to state-of-the-art pre-impregnated materials, the presence of a thermoplastic veil on each side of the material for both processing and mechanical purposes should also be considered when modeling forming in hot conditions. As a dry unidirectional reinforcement, HiTape® is expected to exhibit a transversely isotropic behavior. Computation cost and strong characterization challenges led us to model its behavior at the forming process temperature (above the thermoplastic veil melting temperature) through a homogeneous equivalent continuous medium exhibiting four ‘classical’ deformation modes and a specific structural mode, namely out-of-plane bending. The response of both single plies and stacks of HiTape® to this latter structural mode was characterized at the forming process temperature using a modified Peirce flexometer. Results on single plies showed a non-linear softening moment-curvature behavior and a corresponding flexural stiffness much lower than what can be inferred from continuum mechanics. Moreover, testing stacks revealed that the veil acts as a thin load transfer layer between the plies undergoing relative in-plane displacement, i.e. inter-ply sliding. This inter-ply response was then characterized separately at the forming process temperature thanks to a specific method relying on a pull-through test. Experiments performed at pressures and speeds representative of the forming stage revealed that a hydrodynamic lubricated friction regime predominates, i.e. a linearly increasing relationship between the friction coefficient and the modified Hersey number. From an industrial point of view, high forming pressures and low speeds are therefore recommended to promote inter-ply slip to limit the occurrence of defects such as wrinkles.

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Effect of dynamic friction and static friction in finite element analysis of carbon fiber preform

Yoon

Kang

2023

Polymer Composites

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This paper aims to improve the accuracy of the finite element analysis for the preform shape transformation according to the difference in the type of carbon fiber and friction force. The carbon fiber type (Toray T700, Zoltek), the fiber direction (0°/90°, ± 45°), and the frictional force were measured, which occurred between the fiber and the mold and between the fiber and the fiber. A comparative experiment was conducted through actual preform production by designating it as a variable for element analysis. The analysis was conducted according to the difference between the static friction coefficient and the dynamic friction coefficient in the molding analysis. Within the range of the Coulomb equation, the shear angle changing was compared with the actual preform shape to show similar results.

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More about fibre friction and its measurements

Cited by 24 publications

References 144 publications

Analysis of frictional behaviour of carbon dry woven reinforcement

Analysis of frictional behaviour of carbon dry woven reinforcement

A Contribution to the Study of the Forming of Dry Unidirectional HiTape® Reinforcements for Primary Aircraft Structures

Effect of dynamic friction and static friction in finite element analysis of carbon fiber preform

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