Braided thermoplastic composites from powder‐coated towpregs. Part I: Towpreg characterization

Ramasamy, A.; Wang, Youjiang; Muzzy, John D.

doi:10.1002/pc.10639

Cited by 29 publications

(17 citation statements)

References 7 publications

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“…Summarizing all the results, they concluded that the air-textured commingled yarns with optimized fiber sizing provide the highest transverse modulus and strength, as well as the higher crack resistance [8]. Ramasamy et al [10,11] have studied braided thermoplastic composites from carbon fiber/polyamide 6 powder-coated yarns and also the influence of the consolidation conditions on the laminate properties. The impregnation of fabric structures with thermoplastic polyamide 6.6 in continuous manufacturing was accomplished along the direction of thickness rather than in-plane as usual in liquid composite manufacturing techniques.…”

Section: Introductionmentioning

confidence: 99%

Carbon Fibers/Polyamide 6 Composites Based on Hybrid Yarns

Grozdanov¹,

Bogoeva‐Gaceva²

2009

Journal of Thermoplastic Composite Materials

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This paper reports the results of the analysis of carbon fiber/ polyamide 6 (C/PA6) composites on micro-and macroscale. Two different hybrid yarns, side-by-side (SBS) and fiber-impregnated (FIT) yarns have been studied. To provide information about the role of the surface sizing on the overall properties of the composites, differently sized carbon fibers (C-Hercules and C-Torayca) are used for preparation of model and macrocomposites based on SBS yarns. Consolidation of macrocomposites is performed based on previously optimized processing parameters (2508C, 3 MPa, 30 min) obtained by DSC measurements of model composites. The properties of the composites are studied by tensile test, DMTA, DSC, and TGA. The homogeneity of the fiber distribution and surface fracture after tensile test are analyzed by SEM. The comparison of the results of the same type composites with differently sized carbon fibers has shown improvement of the mechanical properties ($30%) due to the proper fiber/matrix interface (E ?CH/PA6 ¼ 66.7 MPa, E ?CT/PA6 ¼ 44.5 MPa). Thermal analysis of the model and macrocomposites has shown that the crystallization energy conditions are more suitable in composites than in the neat PA6 matrix (t i CH/PA6 ¼ 0.87 min, t i PA6 ¼ 0.92 min, T onset CH/PA6 ¼ 2068C, T onsetPA6 ¼ 2168C).

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Section: Introductionmentioning

confidence: 99%

Carbon Fibers/Polyamide 6 Composites Based on Hybrid Yarns

Grozdanov¹,

Bogoeva‐Gaceva²

2009

Journal of Thermoplastic Composite Materials

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“…[12]. Among the available hybrid yarns, commingled thermoplastic yarns are more suitable for braiding because of their easy handleability [13,14] and relatively superior drapeability. Previous literature shows several instances of incorporation of commingled thermoplastic yarns in a braiding process [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

A novel route for volume manufacturing of hollow braided composite beam structures

Reynolds

Carnegie

Micallef

et al. 2019

Advanced Manufacturing: Polymer & Composites Science

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This work investigates the application of a rapid variothermal moulding process for direct processing of a braided thermoplastic commingled yarn. The process uses locally controllable, responsive tooling which provides opportunities for optimum part quality and significantly reduced cycle times compared with conventional processes. The proposed process was used to directly manufacture hollow beam structures from dry commingled braided preforms. It was demonstrated that the cycle time using the rapid process was reduced by more than 90% as compared to a conventional bladder moulding process, resulting in a total cycle time of 14 min. Additionally, initial three point flexure test results indicated an improvement in the mechanical performance of the resultant parts as compared to the benchmark.

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“…In terms of use as a polymer matrix in fibre-reinforced composite materials, one concept that was previously explored in the aerospace industry was the production of 'towpreg', where carbon-fibre tows were individually spread and either thermoset or thermoplastic powder was sprayed into the tow. These tows could subsequently be braided, woven, turned into tape for automated tape placement, or used to make pultruded sections [17][18][19]. By depositing the powder directly into the tow, the polymer was not required to flow into the tows, making the process suitable for use with thermoplastic powders.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of epoxy powders for processing thick-section composite structures

Maguire

Nayak²,

Brádaigh

2018

Materials & Design

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Epoxy powders were investigated as a processing route for fast, low-cost manufacturing of thicksection fibre reinforced polymer parts. Thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and parallel-plate rheometry were used to characterise the material for realistic processing conditions. The epoxy powders contained heat-activated curing agents and exhibited good thermal stability at and above typical processing temperatures (160-180°C). The exothermic heat produced during curing was found to be small when compared to some conventional epoxies. Similarly, it was shown that epoxy powders can be melted between 45 and 120°C to achieve low viscosities for fibre tow impregnation, without inducing significant cure. Semi-empirical cure kinetics and chemorheological models were presented, which can be used to predict the epoxy's behaviour during part consolidation and curing. Modifications were made to an existing cure kinetics model to better represent the behaviour of the epoxy at lower temperatures. The relationship between glass transition temperature and the degree-of-cure was described using the DiBenedetto equation and was implemented in an existing chemorheological model. The chemorheological model was applied to a standard process cycle to assess the accuracy of the model and the effectiveness of the process cycle.

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Braided thermoplastic composites from powder‐coated towpregs. Part I: Towpreg characterization

Cited by 29 publications

References 7 publications

Carbon Fibers/Polyamide 6 Composites Based on Hybrid Yarns

Carbon Fibers/Polyamide 6 Composites Based on Hybrid Yarns

A novel route for volume manufacturing of hollow braided composite beam structures

Characterisation of epoxy powders for processing thick-section composite structures

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