Microstructural Evaluation of Aligned, Short Fiber TUFF Material

Heider, Dirk; Tierney, John; Henchir, Mohamed A.; Gargitter, Verena; Yarlagadda, Shridhar; Gillespie, John W.; Sun, Jessica; Sietins, Jennifer M.; Knorr, D. D.

doi:10.33599/nasampe/s.19.1609

Cited by 14 publications

(10 citation statements)

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“…3 However, the methodologies employed to produce aligned discontinuous fibres are intricate. A history of the development of the existing fibre alignment methods was presented by Such et al 4 A successful aligned discontinuous-fibre preform production, 5,6 known as TuFF (Tailored Universal Feedstock for Forming), has been developed by researchers at the University of Delaware and was proven capable of translating full properties compared to its continuous carbon fibre/PEI prepreg counterpart. Such high properties for discontinuous fibres are attributable to the fact that the preform fibres are much longer than their critical length and that the fibre ends are randomly distributed in the composite.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of the mechanical properties of woven and unidirectional fibres in discontinuous long-fibre composites

Belliveau

Landry

LaPlante

2022

Journal of Thermoplastic Composite Materials

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Discontinuous long-fibre (DLF) composites can be made with randomly oriented unidirectional pre-impregnated composite chips. High fibre volume fraction unidirectional fibre chips provide good mechanical properties to the DLF composite architecture, which enables this material to contribute to bridging the gap between continuous-fibre and randomly-oriented short-fibre composites. However, it is well known that unidirectional fibres have highly anisotropic in-plane behaviour, which causes weak points in the parts when chips are oriented at unfavourable angles. This can be problematic since chips are randomly oriented in DLF composites. To overcome this problem, this research utilizes woven fibre chips instead of unidirectional fibre chips to fabricate DLF composites. Woven fibres diminish the potential for weak points due to their more homogenized in-plane mechanical properties. For comparison purposes, compression moulded carbon/PEI samples were made from both unidirectional chips and 5HS woven chips. Bending and tensile tests following ASTM guidelines were performed to compare both types of fibre arrangement. The results show that woven fibre chips increase the mechanical properties of the DLF composites and reduce their variability.

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Section: Introductionmentioning

confidence: 99%

Comparative study of the mechanical properties of woven and unidirectional fibres in discontinuous long-fibre composites

Belliveau

Landry

LaPlante

2022

Journal of Thermoplastic Composite Materials

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“…It is well known that the elastic behavior of discontinuous fiber composites is very close to that of continuous fiber composites when the fiber aspect ratio is greater than 100 . TuFF-based laminates have demonstrated high load-carrying capacity and damage tolerance. , Their excellent in-plane stretchability enables planar TuFF preform to conform to surfaces with complex geometry . Moreover, unlike traditional prepregs for polymer composites, the dry TuFF prepregs can be readily impregnated with the polymer electrolyte to fabricate SSCs.…”

Section: Introductionmentioning

confidence: 99%

High-Performance Structural Supercapacitors Based on Aligned Discontinuous Carbon Fiber Electrodes and Solid Polymer Electrolytes

Pei

Yan

et al. 2021

ACS Appl. Mater. Interfaces

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This paper presents an investigation of the potential to use aligned discontinuous carbon fiber dry prepregs as electrodes in structural supercapacitors (SSCs). The high fiber-matrix interfacial bonding of the structural composite was achieved by adopting a solid polymer electrolyte, consisting of poly(vinylidene), lithium triflate, and epoxy. Processing of the SSC was carried out via dip-coating of the polymer electrolyte and then cured using a vacuum bag. The electrochemical performance of the SSCs was measured before and after mechanical loading. The microstructures of the SSCs as-fabricated and damaged under flexural loading were identified by μ-CT imaging. An SSC with a specific capacitance of 0.128 mF/cm 2 (11.62 mF/g), a flexural strength of 47.49 MPa, and a flexural modulus of 8.48 GPa has been achieved, demonstrating significant improvements in mechanical properties over those of SSCs based on woven carbon fiber fabric-based electrodes. The mechanical behavior of the supercapacitors was evaluated by both quasi-static and cyclic flexural loading tests. The excellent electrochemical stability of the supercapacitors was validated by a capacitance retention of above 96% under galvanostatic charge−discharge cycling tests. The knowledge gained in this work will benefit future research in the optimization of SSC performance.

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“… In this study, a flexible asymmetric FSS with core–sheath structure was designed and fabricated. Different from many other carbon fiber electrodes consisting of long continuous fibers, an oriented discontinuous CF named Tailored Universal Feedstock for Forming (TuFF) with electrochemical deposition of PPy was used as the negative and core electrode. It has been reported that the great in-plane stretchability of TuFF material prompts confirmability of complex geometries, , which is particularly beneficial to the fabrication of flexible FSS.…”

Section: Introductionmentioning

confidence: 99%

High-Performance Flexible Asymmetric Fiber-Shaped Supercapacitor Based on CF/PPy and CNT/MnO₂ Composite Electrodes

Yan

et al. 2021

ACS Appl. Energy Mater.

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Fiber-shaped supercapacitors (FSSs) are identified as promising facilities in flexible and wearable energy storage fields. In this study, an electrode with excellent formability was accomplished by depositing polypyrrole on highly aligned discontinuous carbon fiber (CF/PPy). For the FSS with core− sheath structure, CF/PPy fiber was the core electrode, LiCl/PVA was the electrolyte, and carbon nanotube/MnO 2 (CNT/MnO 2 ) film was the opposite electrode. The charge of core and opposite electrodes was paired by adjusting the electrochemical reaction times of MnO 2 and PPy. The obtained FSS had an areal capacitance of 66.27 mF cm −2 (lineal capacitance of 13.52 mF cm −1 and volumetric capacitance of 4.08 F cm −3 ) and a broadened potential window of 1.6 V, which resulted in a maximum energy density of 23.56 μWh cm −2 . The cycling stability was evaluated by charge−discharge test, and it retained 83% of its initial capacitance after 5000 cycles. Furthermore, the FSS showed exceptional flexibility and it retained above 90% of its capacitance after 200 repeated bending tests, illustrating excellent mechanical stability.

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Microstructural Evaluation of Aligned, Short Fiber TUFF Material

Cited by 14 publications

References 0 publications

Comparative study of the mechanical properties of woven and unidirectional fibres in discontinuous long-fibre composites

Comparative study of the mechanical properties of woven and unidirectional fibres in discontinuous long-fibre composites

High-Performance Structural Supercapacitors Based on Aligned Discontinuous Carbon Fiber Electrodes and Solid Polymer Electrolytes

High-Performance Flexible Asymmetric Fiber-Shaped Supercapacitor Based on CF/PPy and CNT/MnO₂ Composite Electrodes

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Microstructural Evaluation of Aligned, Short Fiber TUFF Material

Cited by 14 publications

References 0 publications

Comparative study of the mechanical properties of woven and unidirectional fibres in discontinuous long-fibre composites

Comparative study of the mechanical properties of woven and unidirectional fibres in discontinuous long-fibre composites

High-Performance Structural Supercapacitors Based on Aligned Discontinuous Carbon Fiber Electrodes and Solid Polymer Electrolytes

High-Performance Flexible Asymmetric Fiber-Shaped Supercapacitor Based on CF/PPy and CNT/MnO2 Composite Electrodes

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Product

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High-Performance Flexible Asymmetric Fiber-Shaped Supercapacitor Based on CF/PPy and CNT/MnO₂ Composite Electrodes