Limit of adhesion coefficient measurement of a unidirectional carbon fabric

Aimé, Hugo; Comas-Cardona, Sébastien; Binétruy, Christophe; Schell, Julia; Lacrampe, Marie‐France; DELEGLISE-LAGARDERE, M.

doi:10.1080/20550340.2015.1114797

Cited by 3 publications

(9 citation statements)

References 9 publications

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“…This one‐dimensional (1D) predictive model developed by Bodaghi et al allows one to define the onset of fiber washout based on the drag force and the friction force. The work by Bodaghi et al and similar works by Restrepo, Aimé et al, and Seong et al reveal that different parameters of the preform and resin play a role. They are the preform thickness, preform compressibility, preform architecture (ie, short fibers, no‐crimp, woven, etc.…”

Section: Previous Work and Objectivesmentioning

confidence: 86%

“…Fiber washout distance and the maximum in‐plane drag force can be predicted by the ratio of tangential force to normal forces with properly measured data of friction coefficient; however, it has not been validated with experimental data. This one‐dimensional (1D) predictive model developed by Bodaghi et al allows one to define the onset of fiber washout based on the drag force and the friction force.…”

Section: Previous Work and Objectivesmentioning

confidence: 99%

“…In addition, increasing normal compaction force may cause mold deflection and can lead to fiber damage and knockdown in properties . Therefore, knowledge of these two contributing forces resulting from normal compaction force and injection pressure is necessary to estimate the state of deformation of the reinforcement (Figure ) . The two forces are (a) resultant drag force due to resin flow in the interstices of the reinforcement and the mold surface and (b) Friction force (tangential force), which is equal to the product of the coefficient of friction (COF) induced by the normal compaction force applied by the mold on the reinforcement and the compaction force.…”

Section: Previous Work and Objectivesmentioning

confidence: 99%

“…The entire cycle from the preform placement, the mold closure, injection, and mold filling is on the order of a few minutes. Fast cure of the resin allows one to complete the production cycle within a few additional minutes . High‐pressure injection technology for low production cycle time of composite materials has evolved significantly making it possible for these materials to find an ever‐increasing place in the automotive and aeronautical sectors.…”

Section: Introductionmentioning

confidence: 99%

“…Resin injected under high pressure into a mold cavity exerts a large local force on the preform that can be displaced from its original position if the clamping force and/or the friction coefficient between the plies or the mold and the plies is insufficient . This is termed as “fiber washout” which is flow‐induced and causes unacceptable deformation of the reinforcement, and introduction of excessive resin and/ or dry fiber zones . It may also change local fiber volume fraction and the permeability of preform and lead to inconsistent mechanical performance …”

Section: Introductionmentioning

confidence: 99%

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Experimental parametric study of flow‐induced fiber washout during high‐injection‐pressure resin transfer molding

2019

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Fiber washout during high‐injection‐pressure resin transfer molding (HIPRTM) is an unwanted emergent defect. This article addresses the mechanisms that cause fiber washout during manufacturing of composite parts by HIPRTM. The key focus of this work is on one‐dimensional flow experiments using HIPRTM process in which in‐plane drag force due to high resin pressures is responsible for the fiber washout. An experimental parametric study is conducted to investigate the influence of the fabric architecture, number of plies, and injection pressure to identify controllable process and material factors to prevent fiber washout. The results show that as the ratio of tangential force between the mold/ply and the drag force increases, one would expect fiber washout to occur and either cause fiber waviness or form wrinkles and dry spots. The fiber washout distances measured from the experiments were used to validate the model developed in our previous work. The numerical simulations by LIMS qualitatively agreed with the experimentally measured behavior. It is concluded that the formation of dry spot is due to the contribution of two main factors: (a) very significant permeability reduction in the wrinkled region and (b) some race‐tracking.

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Section: Previous Work and Objectivesmentioning

confidence: 86%

Section: Previous Work and Objectivesmentioning

confidence: 99%

Section: Previous Work and Objectivesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental parametric study of flow‐induced fiber washout during high‐injection‐pressure resin transfer molding

2019

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On the variability of permeability induced by reinforcement distortions and dual scale flow in liquid composite moulding: A review

Lomov

Šimáček

Correia

et al. 2019

Composites Part A: Applied Science and Manufacturing

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A model for fibre washout during high injection pressure resin transfer moulding

Correia¹,

Šimáček

Advani

2018

Journal of Reinforced Plastics and Composites

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High injection pressure resin transfer moulding is a variant of resin transfer moulding in which the preform is compressed in a tool and resin is injected into the mould under very high pressure. The high injection pressure (>20 bar) introduces possible fibre washout that translates into manufacturing defects or causes inconsistencies in processing and leads to scatter in mechanical properties of composite parts. A model is presented which quantifies and provides insight into the influence of process variables such as clamping force and injection pressure on fibre washout distance (the one-dimensional model assumes a rigid preform). A generalised one-dimensional stress model for fibre washout is presented for regions that are impregnated with the resin and the regions that are dry. The model shows fibre washout to be significant at the beginning of the injection process. The model allows one to further refine the injection strategy by adjusting injection pressure to account for washout in high injection pressure resin transfer moulding.

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Limit of adhesion coefficient measurement of a unidirectional carbon fabric

Cited by 3 publications

References 9 publications

Experimental parametric study of flow‐induced fiber washout during high‐injection‐pressure resin transfer molding

Experimental parametric study of flow‐induced fiber washout during high‐injection‐pressure resin transfer molding

On the variability of permeability induced by reinforcement distortions and dual scale flow in liquid composite moulding: A review

A model for fibre washout during high injection pressure resin transfer moulding

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